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Recent Homework Questions About Physics
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Physics
how do you find the mass of a nitrogen molecule?
Physics
How many atoms of hydrogen are in 220g of hydrogen peroxide (H2O2)? This is what I did so far: the molecular weight of H2O2 = 2*1 +2*16 =34 therefore, there are 220/34 moles of the molecule = 6.47 moles, so there are 6.47xAvogadro's number of molecules there are 2 H atoms ...
Physics
Problem:: A 4.80 kg block located on a horizontal frictionless floor is pulled by a cord that exerts a force F=13.5 N at an angle q= 17.5° above the horizontal. What is the speed of the block 3.90 seconds after it starts moving? What I've got:: Using sin and cos, I'...
Physics
I was just a little confused with this problem and was hoping for some help or a nudge since the only value given is 27 degrees. Thanks for your time! George of the Jungle, with mass m, swings on a light vine hanging from a stationary tree branch. A second vine of equal length...
physics
A 1.0 kg red superball moving at 5.0 m/s collides head-on with stationary blue superball of mass 4.0 kg in an elastic collision. What are the final velocities of the two superballs after the collision?
Physics
A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 800 N and the angle between the two ropes is 20°. How hard must each player pull to drag the coach at a steady ...
Physics
if measurements show precise position for an electron can those measurements show precise momentum aslo? Explain
Physics
Please someone help me I'm desperate!!!! Two steel guitar strings have the same length. String A has a diameter of 0.59 mm and is under 420.0 N of tension. String B has a diameter of 1.3 mm and is under a tension of 840.0N . Find the ratio of the wave speeds,VA/VB , in the...
physics
A 71.4 kg satellite orbits the earth at a distance of 7.00E6 m from the center of the earth (a distance of 630 km above the earth's surface). How fast must the satellite be going to maintain its orbit if the free fall acceleration at this distance is 8.14 m/s^2?
physics
A 783 kg car travels along US 321. What net force is required to keep the car traveling at a constant speed of 28.8 mph around a curve whose radius is 26.4 m?
Physics
A 2.6 N block is at rest on a horizontal surface. A 0.9 N upward force is applied to the block by means of attached vertical string. (a) What is the magnitude of the force of the block on the horizontal surface?
Physics
A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 800 N and the angle between the two ropes is 20°. How hard must each player pull to drag the coach at a steady ...
science-physics
An electric heater draws a a current of 10A from a 220 V supply .What is the cost of using the heater for 5 hours everyday for 30 dats if the cost of 1 unit (1 kWh)is 60 paise(indian currency)
AP Physics - Fluids
A 6.0-cm diameter horizontal pipe gradually narrows to 4.0 cm. When water flows through this pipe at a certain rate, the gauge pressure in these two sections is 32 kPa and 24 kPa, respectively. What is the volume rate of flow? I know to use Bernoulli's Equation and the Equ...
physics
At an accident scene on a level road, investigators measure a car's skid mark to be 78 m long.It was a rainy day and the coefficient of friction was estimated to be 0.38. Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes.
Physics
A football coach sits on a sled while two of his players build their strength by dragging the sled across the field with ropes. The friction force on the sled is 800 N and the angle between the two ropes is 20°. How hard must each player pull to drag the coach at a steady ...
Physics
(a) Suppose you throw a football. At some instant, when the ball is in contact with your hand, your hand exerts a force of 100 N on the ball in the +x direction. What is the force of the ball on your hand?
Physics
A 2.6 N block is at rest on a horizontal surface. A 0.9 N upward force is applied to the block by means of attached vertical string. (a) What is the magnitude of the force of the block on the horizontal surface?
Physics
7.7mol of helium are in a 16L cylinder. The pressure gauge on the cylinder reads 65psi. What are (a) the temperature of the gas in Celsius and (b) the average kinetic energy of a helium atom? Part A: so this is what i did T=PV/nR and C=T-273 P=65psi=4.481592e^5Pa V=16L=.016m^3...
Physics
A radioactive nucleus at rest decays into a second nucleus, an electron, and a neutrino. The electron and neutrino are emitted at right angles and have momenta of 9.40 x 10^-23 kg·m/s, and 6.00 x 10^-23 kg·m/s, respectively. What is the magnitude and direction of...
Physics
A 20 g rifle bullet traveling 225 m/s buries itself in a 3.6 kg pendulum hanging on a 2.8 m long string, which makes the pendulum swing upward in an arc. Determine the vertical and horizontal components of the pendulum's displacement.
Physics
A 0.500 kg block is sitting on a horizontal, frictionless surface. The block is connected to a horizontal spring with a force constant of 124 N/m. The other end of the horizontal spring rests against a wall. When a 100.0 g arrow is fired into the wooden block, the spring compr...
physics
An artillery shell is fired at an angle of 45.3◦ above the horizontal ground with an initial speed of 1710 m/s. The acceleration of gravity is 9.8 m/s2 . Find the total time of flight of the shell, neglecting air resistance. Answer in units of min.
Physics
31m/s is a typical highway speed for a car. At what temperature do the molecules of nitrogen gas have an rms speed of 31m/s? T=[(x^2)*m]/3k so x=31m/s m=N2=2*14=28g=.028kg k=1.38e^-23..I'm keep getting 6.333651477e^10...which is incorrect. What am I missing?
Physics
Hi guys hope someone here can maybe help me out. Two loudspeakers are placed at either end of a gymnasium, both pointing toward the center of the gym and equidistant from it. The speakers emit 286 Hz sound that is in phase. An observer at the center of the gym experiences cons...
physics
A particle travels horizontally between two parallel walls separated by 18.4 m. It moves toward the opposing wall at a constant rate of 6.7 m/s. Also, it has an acceleration in the direction parallel to the walls of 1.7 m/s2 . What will be its speed when it hits the opposing w...
Physics
A 0.500 kg block is sitting on a horizontal, frictionless surface. The block is connected to a horizontal spring with a force constant of 124 N/m. The other end of the horizontal spring rests against a wall. When a 100.0 g arrow is fired into the wooden block, the spring compr...
physics
calculate the rate at which atoms of a particular fission product are being produced directly by 1 kg of 235U in a thermal neutron flux of 6.92x10^13 if the radionuclide's individual fission yield is .00536%
College physics
A projectile is launched vertically from the surface of the Moon with an initial speed of 1400 . At what altitude is the projectile's speed one-half its initial value? do you use the equation Ei = Ef and vf would be 700 E= 1/2 mv^2 -G (Mass of the moon/radius)
Physics
Total lung capacity of a typical adult is approximately 5.0L. Approximately 20% of the air is oxygen, as air is 20% oxygen. At sea level and at an average body temperature of 37 C, how many moles of oxygen do the lungs contain at the end of an inflation? n=PV/RT V=5.0L=.005m^3...
Physics
A playground merry-go-round has a disk-shaped platform that rotates with negligible friction about a vertical axis. The disk has a mass of 240 kg and a radius of 1.4 m. A 33- kg child rides at the center of the merry-go-round while a playmate sets it turning at 0.20rpm. If the...
Physics
On a cool morning, when the temperature is 13 C, you measure the pressure in your car tires to be 30 psi. After driving 50 mi on the freeway, the temperature of your tires is 42C. What pressure will your tire gauge now show? T1 = 13 C T2 = 42 C P1 = 30 psi P2 = ? By perfect ga...
Physics
If you place a glass test tube in water, you can see the tube. If you place it in clear soybean oil, you may not be able to see it. What does this indicate about the speed of light in the oil and in the glass?
physics
A box is given a push so that it slides across the floor. How far will it go, given that the coefficient of kinetic friction is 0.17 and the push imparts an initial speed of 4.1 m/s?
physics
a metal tank with a volume of 3.10 L will burst if the absolute pressure of the gas exceeds 100 atm. If 11 mol of an ideal gas is put into the tank at a temperature of 23.0 C, to what temperature can the gas be warmed before the tank ruptures? Neglect the thermal expansion of ...
Physics
e) Adjust the amplitude control of the function generator until the signal has a 6V peak-to-peak swing. The resultant form will have the following mathematical equation: v = Vm sin2(pi)ft = 3sing2(pi)500t f) The sinusoidal signal 3sin2(pi)500t has an effective value determined...
physics
In a gas at standard temperature and pressure, what is the length of the side of a cube that contains a number of molecules equal to the population of the earth (about 6 million people at present)? I know STP is 1 atm and 273K, but I have no clue how to start this problem. Any...
physics
18g of liquid water is placed in a flexible bag, the air is excluded, and the bag is sealed. It is then placed in a microwave oven where the water is boiled to make steam at 100C. What is the volume of the bag after all the water has boiled? Assume that the pressure inside the...
Physics
Hello im kinda new here and hoping someone can help me with this energy conservation question (I believe). A 2.10g- bullet embeds itself in a 1.30kg - block, which is attached to a spring of force constant 770 N/m . 1) If the maximum compression of the spring is 5.60 cm , find...
Physics
Need help ASAP for this one, really hard. to Assignment 11Problem 13.26 Tuning Forks in Neurology Tuning forks are used in the diagnosis of nervous afflictions known as large-fiber polyneuropathies, which are often manifested in the form of reduced sensitivity to vibrations. D...
physics
A trajectile, of mass 20 g, traveling at 350 m/s, strikes a steel plate at an angle of 30-degrees with a plane of the plate. It ricochets off at the same angle, at a speed of 320 m/s. What is the magnitude of the impulse that the steel plate gives to the trajectile?
physics
A billiard ball approaches a cushioned edge of a billiard table with momentum, p. After the collision with the cushion, it bounces straight back with the same amount of momentum in the opposite direction. What is the impulse on the ball?
physics
If a force of 300N is exerted upon a 60 kg mass for 4 seconds, how much impulse does the mass experience?
Physics
A 0.260 kg block on a vertical spring with a spring constant of 5.00x10^3 N/m is pushed downward, compressing the spring 0.100 m. When released, the block leaves the spring and travels upward vertically. How high does it rise above the point of release?
Physics-please help!!!
A 190 g particle is released from rest at point A inside a smooth hemispherical bowl of radius 25.0 cm. Calculate the gravitational potential energy at A also, how do you find kinetic energy if you aren't given velocity? please help me! i would really appreciate it
Physics
1) The vector sum of three vectors gives a resultant equal to zero. what can you say about the vectors? 2) Vector is 3.00 units in length and points along the positive x-axis. Vector is 4.00 units in length and points along the negative y-axis.Use graphical methods to find the...
physics
A 0.25 kg stone tied to a 0.5 m string whirls at a speed of 4 m/s. What is the centripetal acceleration acting on the stone?
Physics
How many atoms of hydrogen are in 220g of hydrogen peroxide (H2O2)? the molecular weight of H2O2 = 2*1 +2*16 =34 therefore, there are 220/34 moles of the molecule = 6.47 moles, so there are 6.47xAvogadro's number of molecules there are 2 H atoms per molecule, so multiply 2...
physics
A merry go round in the park has a radius of 1.8 m and a rotational inertia of 900 kg-m^2. A child pushes the merry go round with a constant force of 80 N applied at the edge and parrallel to the edge. A frictional torque of 12 Nm acts at the axle of the merry go round. What i...
Physics/ can Dr. help me
How many grams of water (H_2O) have the same number of oxygen atoms as 1.0 (mol} of oxygen gas?
physics
A wheel initially rotating at an angular speed of 1.2 rad/s turns through 34 revolutions during the time that it is subject to angular accelaration of .4 rad/s/s. How long did the accelaration last? So I used theta=Wot+.5at^2. converted rev to rad. and set it up like a quadrta...
Physics
How many grams of water (H_2O) have the same number of oxygen atoms as 1.0 (mol} of oxygen gas? atomic mass of H is 1 and O is 16, so H2O has a molar mass of 18. Oxygen gas is O2, with a molar mass of 32. So 1.0 mole of oxygen gas has 6.02x10^23 molecules = 12.04x10^23 oxygen ...
physics
A 24 kg beam is attached to a wall with a hinge and its far end is supported by a cable. The angle between the beam and the cable is 90 degrees and the beam is inclined at an angle of 13.6 degrees with respect to the horizontal. What is the magnitude of the force that the beam...
physics.
I have tried the problems. the only thing is the difference in names. I have been able to figure out the tendon problem as well as this very question. I am having a hard time doing the other two. It would be nice to get some help. thanks.
physics
A worker exerts a 140 N horizontal force on a 41 kg crate. The crate's acceleration across a level floor is 0.90 m/s2. Find the frictional force that the floor exerts on the crate.
physics
If you use a horizontal force of 30.0 N to slide a 11.5 kg wooden crate across a floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor? how i do this?
Physics
A grocery cart with a mass of 18 kg is pushed at constant speed along an aisle by a force F = 12 N. The applied force acts at a 20° angle to the horizontal. Find the work done by each of the forces on the cart if the aisle is 14 m long. work done by the applied force work ...
Physics
A common demonstration, illustrated below, consists of a ball resting at one end of a board of length and elevated at an angle è. A light cup is attached to the board at r so that it will catch the ball when the support stick is suddenly removed. (a) Show that the ball ...
Physics
Can someone please help me with the following 2 questions? I wasn't sure if I was grasping the whole idea. **Consider a baseball that is caught and then thrown at the same speed. Which case illustrates the greatest change in momentum, which requires the greatest impulse: t...
physics
A playground merry-go-round has a disk-shaped platform that rotates with negligible friction about a vertical axis. The disk has a mass of 240 kg and a radius of 1.4 m. A 33- kg child rides at the center of the merry-go-round while a playmate sets it turning at 0.20rpm. If the...
Physics
A 0.58- kg flashlight is swung at the end of a string in a horizontal circle of 0.85- m radius with a constant angular speed. If no torque is applied, what must the radius become if the angular speed of the flashlight is to be halved?
physics
A Modified Atwood's machine (the pulley with two mass system used in class on in the Modified Atwood physlet) has a 10.0 N cart on a frictionless, horizontal track with a 10.0 N hanging weight attached to a string connecting the two weights. A second track is set up where ...
physics
how many electrons must be removed from an electrically neutral silver dollar to give a charge of +2.8 uc
Physics
a 3.7 kg dog stands on a 19 kg flatboat at distance D = 6.1 m from the shore. It walks 2.6 m along the boat toward shore and then stops. Assuming no friction between the boat and the water, find how far the dog is then from the shore. _ _ _ _ _ _ m
Physics
A 2.85 kg stationary package explodes into three parts that then slide across a frictionless floor. The package had been at the origin of a coordinate system. Part 1 has mass m1 = 0.500 kg and velocity (10.0 + 12.0) m/s. Part 2 has mass m2 = 0.750 kg, a speed of 13.5 m/s, and ...
Physics
Particle 1 of mass 240 g and speed 3.20 m/s undergoes a one-dimensional collision with stationary particle 2 of mass 400 g. (a) What is the magnitude of the impulse on particle 1 if the collision is elastic? _____kg·m/s (b) What is the magnitude of the impulse on partic...
Physics
A railroad car moves under a grain elevator at a constant speed of 4.10 m/s. Grain drops into the car at the rate of 660 kg/min. What is the magnitude of the force needed to keep the car moving at constant speed if friction is negligible? ________ N
Physics
An airplane pilot fell 380 m after jumping from an aircraft without his parachute opening. He landed in a snowbank, creating a crater 1.4 m deep, but survived with only minor injuries. Assuming the pilot's mass was 80 kg and his terminal velocity was 50 m/s, estimate the f...
Physics
A 0.535 kg wood block is firmly attached to a very light horizontal spring (k = 175 N/m. It is noted that the block-spring system, when compressed 5.0 cm and released, stretches out 2.3 cm beyond the equilibrium position before stopping and turning back. What is the coefficien...
Physics
In the high jump, the kinetic energy of an athlete is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must the athlete leave the ground in order to lift his center of mass 1.75 m and cross the bar with a speed of 0.63 m/s?
physics
The driver of a 1024 kg truck traveling 32.6 m/s North on I-77 has to make a sudden stop. If it requires a distance of 57.1 m for the truck to stop, use conservation of energy to find the net force acting on the truck.
physics
A box of mass 12.6 kg is pulled to the right with a horizontal force of 14 N. If the box moves to the right with a constant velocity of 1.68 m/s, what is the frictional force acting on the box? What is the coefficient of friction for this situation?
Physics
A massless string runs around two massless, frictionless pulleys, where one pulley is attached to the ceiling, and the other is suspended with a mass m. An object with mass m = 17 kg hangs from one pulley. A force F is exerted on the free end of the string to lift the object a...
physics!
If the speed of a car is increased by 35%, by what factor will its minimum braking distance be increased, assuming all else is the same? Ignore the driver's reaction time.
physics help!!!
What is the minimum work needed to push a 900 kg car 460 m up along a 17.5° incline? (a) Ignore friction. (b) Assume the effective coefficient of friction retarding the car is 0.30?
Physics
An object of mass m = 2.7 kg moves with initial speed vinitial = 2.2 m/s, then interacts with its environment, releasing 4.4 J of work. What is the speed of the object after the interaction is completed? My ans: I found KE initially and then subtracted 4.4J and with the new va...
Physics1
Two blocks are initially held at rest on 30° frictionless ramps . The 4 kg block is 1.25 m from the base of the ramp and the 3 kg block is 5 m above the base of the ramp. The two blocks are then released and slide down the ramps and onto a frictionless horizontal surface. ...
Physics
A 4kg and a 2kg block are moving along a horizontal frictionless surface. The 4 kg block is moving to the right with a speed of 6 m/s and the 2 kg block is moving to the left with a speed of 3 m/s. The two blocks collide inelastically and then continue to move together along t...
physics
A soccer ball kicked with a force of 13.4 N accelerates at 7.8 m/s2 to the right. What is the mass of the ball? Answer in units of kg.
physics
A car has a mass of 1.56 × 103 kg. If the force acting on the car is 6.63 × 103 N to the east, what is the car’s acceleration? Answer in units of m/s2.
physics
A cat chases a mouse across a 0.51 m high table. The mouse steps out of the way, and the cat slides off the table and strikes the floor 1.5 m from the edge of the table. The acceleration of gravity is 9.81 m/s2 . What was the cat’s speed when it slid off the table? Answer...
Physics
The 3.0 cm-diameter water line splits into two 1.0cm-diameter pipes. All pipes are circular and at the same elevation. At point A, the water speed is 2.0m/s and the gauge pressure is 50kPa. What is the gauge pressure at point B?(pointing toward one of the split pipes)
Physics
Another one, sorry! =P This stuff is really confusing.. Why doesn't friction depend on surface area?
AP Physics B
The college board website only has exams from 1999 to last years. Some how my teach has gotten ahold of the free response questions from like 1980 and he said that they are open to the public and can be found on the internet. I can't seem to find were they are all the exam...
Physics
When an object slides over a smooth horizontal surface, how does the force of friction depend on the force of gravity on the object?
Physics
A spring has a spring constant of 259N/m. Find the magnitude of the force needed (a) to stretch the spring by 3.54 10-2m from its unstrained length and N (b) to compress the spring by the same amount. N
Physics
An asteroid revolves around the Sun with a mean orbital radius twice that of Earth's. Predict the period of the asteroid in Earth years. (6.38*10^6 radius) I dont understand how to solve this problem.
Physics
The displacement of a standing wave on a string is given by D=3.6sin(.54x)cos(37t), where x and D are in centimeters and t is in seconds. What is the distance in cm between the nodes in centimeters? Give the amplitude of each of the component waves, meaning that there two, in ...
physics
The maximum speed that a car can travel around a flat curved road is 18m/s. What would be the maximum speed for that car around a curve with half the radius?
Physics
An object is placed on an inclined plane which forms an angle B = 18º with the horizontal. An external force F of magnitude 14.3 N is applied to the object. The force F acts in a direction which forms an angle A = 62º with the horizontal. As a result of the force F, ...
physics
An aluminum saucepan with a diameter of 18 cm and a height of 6.0 cm is filled to the brim with water. The initial temperature of the pan and water is 19°C. The pan is now placed in a refrigerator and cooled to 9°C. Calculate the drop in water level in the pan.
Physics
A crate on a floor has an applied force 15 degrees below horizontal of 952N The crate moves with constant velocity. The coefficient of kinetic friction is 0.15. What is the mass of the crate ?
Physics
A pendulum consists of an object of mass m = 1 kg swinging on a massless string of length l = 258 cm. The object has a speed of 1.6 m/s when it passes through its lowest point. What is the greatest angle with the vertical that the string makes during the motion of the object? ...
physics entry
A meteor headed straight towards the earth has an approach speed of 2.00e3 m/s at a distance of 7 earth radii from the center of the earth. What will be its speed when it reaches earth a 6.38e6 m(ignore the effects of atmosphere)?
physics escape
The escape speed from a distant planet is 42 km/s. If the accelaration of gravity on the planet is 11.0 m/s/s, what is the radius of the planet?
Physics
A car on a roller coaster has a mass of 9528 kg. The car is dragged up the main hill at an angle of 38 degrees ( above horizontal) for a distance of 182 m to the top of the first hill. What work was done to the car ?
Physics
A uniform horiztonal beam is attached to a veritcal wall by a frictionless hinge and supported from below at an angle theta = 39 degrees by a brace that is attached to a pin. The bean has a weight of 340 N. Three additional forces keep the beam in equilibrium. The brace applie...
Physics
Determine the work done by a person when lowering an object of mass 2.6 kg by a distance of 2.4 m. The person applies a force Fext such that the object moves with constant speed, i.e., without acceleration? My ans: W=F*d F = ma But it's saying constant speed so a=0 However...
Physics
Two people push on a crate. Person 1 pushes in the positive X direction with a force of 25N. The second person pushes in the negative X direction at an angle of 15 degrees below the horizontal with a magnitude of 18.5N the box moves with uniform velocity. What is the force of ...
physics
Two identical cars hit each other and lock bumpers. If a car moving with a speed of 90km/h approaches a stationary car, what is the speed immediately after coupling cars. You use and solve for V: M1V1+M2V2=(M1+M2)V I end up with the following because my question does not give ...
Physics
Determine the work done by a person when lowering an object of mass 2.6 kg by a distance of 2.4 m. The person applies a force Fext such that the object moves with constant speed, i.e., without acceleration,
Physics
A 10cm times 10cm times 10cm wood block with a density of 700kg/m^{3} floats in water. What is the distance from the top of the block to the water if the water is fresh? weight= density*volume*g weight=700*(0.001)*9.81 weight=6.86newton weight=densitywater*g*10cm*10cm*depth 6....
Physics
Water flowing through a 2.8 cm-diameter pipe can fill a 200 L bathtub in 5.8 min. Flow rate Q = volume/time = speed * cross section area Q=200/5.8=speed*.028....i get 1231.52 or Q=(200/348)=speed*.028...i get 20.52 both are wrong so what do i do? then i did speed=200/(pi*.25^2...
Physics
I have a problem where I've solved a and b. I need to solve c. It's a centripetal force problem. So far I have. v(speed)=2.5pi R(radius)=3.5 m(mass)=2 t(time)=2.8 Ac (centripetal acceleration)=17.62 How would I find tension? (Hint: The tension provides Fc) Fc is centri...
physics
A spring with a force constant of 300 n/m is compressed 5 cm. What is the work done on the spring?
Physics
An object of mass 0.7 kg is thrown vertically upwards at a speed of 23 m/s. What is the gravitational potential energy of the object at the highest point of its trajectory?
physics
Hi, i really need help with this question. Two identical cars hit each other and lock bumpers. A car moving with a speed of 90 km/h approaches a stationary car
physics
A spring has k = 88 N/m. Use a graph to determine the work needed to stretch it from x = 3.6 cm to x = 5.6 cm, where x is the displacement from its unstretched length.
Physics
In a mechanical experiment with an isolated object, only Ekin and Epot of the object change. If the object accelerates from 5 m/s to 10 m/s, its potential energy has? My ans: Potential energy has decreased by a factor of 2 because kinetic energy has increased by a factor of 2?
physics
-32 50 to vertical coordination
physics
A small block on a frictionless horizontal surface has a mass of 2.50×10−2 . It is attached to a massless cord passing through a hole in the surface. (See the figure below .) The block is originally revolving at a distance of 0.300 from the hole with an angular spe...
Physics
A block of wood with volume V floats in water with 0.68V submerged. In oil the block floats with 0.86V of its volume submerged. What's the density of the wood?
Physics
How many grams of water (H_2O}) have the same number of oxygen atoms as 1.0mol of oxygen gas?
physics
A shop sign weighing 230 N is supported by a uniform 115 N beam as shown in Fig. 9-54. Find the tension in the guy wire.
physics
A 13 cm long animal tendon was found to stretch 3.8 mm by a force of 13.8 N. The tendon was approximately round with an average diameter of 7.0 mm. Calculate the elastic modulus of this tendon.
physics
Approximately what force, FM, must the extensor muscle in the upper arm exert on the lower arm to hold a 7.9 kg shot put (Fig. 9-66)? Assume the lower arm has a mass of 2.8 kg and its CG is 11.2 cm from the pivot point.
physics
The 66 kg man's hands in Figure 9-56 are 36 cm apart. His CG is located 90% of the distance from his right hand toward his left. Find the force on each hand due to the ground. a)the man's left hand b)the man's right hand 2
Physics
A block of mass M=2 kg is swung on a rope in a veritcal circle(the direction of motion is vertical to the ground) of radius r. When the block is at the top of the circle, the tension in the rope is measured to be 10N. What is the tension in the rope when the block is at the bo...
physics
a stone of mass o.5 kg is dropped from a height of 5om.what is the kinetic energy of the stone just before it strikes the ground?
physics
a stone of mass o.5 kg is dropped from a height of 5om.what is the kinetic energy of the stone just before it strikes the ground
Physics
Water flowing through a 2.8 cm-diameter pipe can fill a 200 L bathtub in 5.8 min. Flow rate Q = volume/time = speed * cross section area Q=200/5.8=speed*.028....i get 1231.52 or Q=(200/348)=speed*.028...i get 20.52 both are wrong so what do i do?
Physics
A 10cm times 10cm times 10cm wood block with a density of 700kg/m^{3} floats in water. What is the distance from the top of the block to the water if the water is fresh? weight= density*volume*g weight=700*(10^-3)*9.81 weight=3418.877985 weight=densitywater*g*10cm*10cm*depth 3...
Physics
A basketball player is trying to make a half-court jump shot and releases the ball at the height of the basket. Assuming that the ball is launched at 51 degrees, 14.0 m from the basket what speed must the player give the ball? So far I found the Vy to be 8.55 m/s...but I don&#...
Physics 11
I need help on this question 79 g of water at 95 degree Celsius were added to tap water at 22 degree Celsius, and the Temperature of the mixture after all thermal energy transfer ended at 36 degree Celsius. What was the mass of the tap water? (teacher's answer key : 412 gr...
physics
A pendulum consists of an object of mass m = 1.2 kg swinging on a massless string of length l = 259 cm. The object has a speed of 2.4 m/s when it passes through its lowest point. What is the greatest angle with the vertical that the string makes during the motion of the object...
physics
A massless string runs around two massless, frictionless pulleys. An object with mass m = 20 kg hangs from one pulley. A force F is exerted on the free end of the string to lift the object at a constant speed by a distance of 2.3 m. What is the work done on the object by the f...
physics
when a mass attached to a spring is released from rest 3.0 cm from its equilibrium position, it oscillates with a frequency f. If this mass were instead released from rest 6.0 cm from its equilibrium position, it would oscillate with frequency.. A.2f B.sqrt 2f C.f D.f/2 I can ...
physics
An object of an unknown mass is attached to an ideal spring with force constant 120 N/m and is found to vibrate with a frequency of 6.00 Hz. Find (a) the period, (b) the angular frequency, and (c) the mass of this object.
Physics
A 17 kg child descends a slide 3.5 m high and reaches the bottom with a speed of 1.5 m/s. How much thermal energy due to friction was generated in this process?
PHYSICS!!
An amusement park ride consists of a rotating circular platform 8.26 m in diameter from which 10 kg seats are suspended at the end of 1.14 m massless chains. When the system rotates, the chains make an angle of 16.2 degrees with the vertical. The acceleration of gravity is 9.8...
Physics - Work and Energy
Jane, looking for Tarzan, is running at top speed (3.6 m/s) and grabs a vine hanging vertically from a tall tree in the jungle. How high can she swing upward? Does the length of the rope matter?
Physics - Work and Energy
(a) If the KE of an arrow is quadrupled, by what factor has its speed increased? (b) If the speed is doubled, by what factor does its KE increase?
Physics
Useful Constants: 1 Torr = 133.32 Pa; R = 8.3145 J/mol·K You have a thin metal sphere of unknown volume that contains helium gas at low pressure. You put the entire metal sphere into a bath of liquid nitrogen, and a pressure gauge on the sphere indicates a pressure of 2...
Physics
A pulley with a rotational interia of 4.4*10^-3 kg m^2 about its axle and a radius of 6 cm is acted on by a force applied tangentially at its rim. The force magnitude varies in time as F=0.32t + 0.27t^2 where F is in newtons if t is given in seconds. The pulley is initially at...
Physics
A beaker of mass mb containing oil of mass m1 and density ρ1 rests on a scale. A block of iron of mass m2 and density ρ2 is suspended from a spring scale and completely submerged in the oil. Determine the equilibrium readings of both scales. (Use rho_1 for ρ1, r...
physics
The following forces act on a hockey puck (round, rubber disk) sitting on a frictionless surface: F_1 = 12 N at 15 degrees; F_2 = 28 N at 125 degrees; and F_3 = 33.3 N at 235 degrees. All the forces are in the plane of the ice. Determine the net force on the puck.
Physics
Describe the Bohr model of the atom. What is de Broglie's key idea (involving matter waves) that makes the Bohr atom have discrete energy levels?
Physics
The higher the energy level occupied by an electron in the hydrogen atom, the larger the atom. The diameter of the atom is proportional to n^2, where n=1 labels the lowest or "ground" state, n=3 is the thrid state, and so on. If the atom's diameter is 1 x 10^(-10...
physics
A rope is stretched with a tension of 248 N. The rope is of length 12.5 m with a mass of 161 g. Two pulses are formed at opposite ends of the rope, separated in time by 30.1 ms. Determine how far from the farther end of the rope the pulses will first meet?
physics
A hammer taps on the end of a 4.02 m long metal bar at room temperature. A microphone at the other end of the bar picks up two pulses of sound, one that travels through the metal and one that travels through the air. The pulses are separated in time by 5.79 ms. What is the spe...
physics
A box of mass 18.8 kg is pulled to the right with a horizontal force of 9 N. If the box moves to the right with a constant velocity of 1.06 m/s, what is the frictional force acting on the box?
physics
If the frequency of oscillation of the wave emitted by an FM radio station is 89.8 MHz, determine the wave's wavelength. This is what I did: 89.8 MHz = 89800000 Hz v = lambda x f lambda = v/f = 343 m/s/89800000 Hz = 3.82 x 10^-6 m What am I doing wrong?
physics
a ball is dropped from a height.another ball is thrown parabolic to the ground from the same height.which ball will reach first and why.
Physics-Astronomy
A high-velocity star HVS 1 is moving at 600 km/s, 0.2% speed of light. Assuming the HVS 1 is moving away from us, and that its velocity is oriented entirely along our line of sight, determine the Doppler shift of the Ha spectral line (6562.8 Angstrom) produced by this star. Is...
Physics-Astronomy
Hello, I have no idea how to do the following question. Any help would be appreciated: An energy of at least 13.6 electron-volts is required to ionise a hydrogen atom. What is the longest wavelength of electromagnetic wave capable of ionising hydrogen? And which regions of the...
Public High School AP Physics B
Ok I got a question I'm confused by the compression ratio bit in this problem and don't know how to do it If 3.00 m^3 of a gas initally at STP is placed under a pressure of 3.20 atm, the temperature of the gas rises to 38.0 degrees C. What is the volume? I did this p1V...
physics
a person pushes a 10kg mass at a constant speed across a u=0.150, 8.50m long floor at a constant speed how much work does the person do? (125J) how much work does friction do? ( -125J)
physics
One projectile is launched horizontally while another is dropped from rest at the same time. Which will hit the floor first?
Physics
Thanx DRWLS! Worked like a charm and I checked behind myself with the same formula!!!
physics
A pendulum has a period of 2s. What chcange in its length will double the period?
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