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Recent Homework Questions About Physics
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physics
A heavy wooden block rests on a flat table and a high-speed bullet is fired horizontally into the block, the bullet stopping in it. How far will the block slide before coming to a stop? The mass of the bullet is 10.5 g, the mass of the block is 10.5 kg the bullet’s impac...
physics
Two charges of -5 x 10(power -6) C and 3 x 10(power -6) C are placed at distance of 200mm from each other , find point on the line joining the charges at which electric field is zero.
physics
Show that beta = 3 alpha Why a gas has two heat capacities?
physics
When an automobile moves with constant speed down a highway, most of the power developed by the engine is used to compensate for the mechanical energy loss due to frictional forces exerted on the car by the air and the road. If the power developed by the engine is 195 hp, esti...
Physics
Tarzan swings on a 27.0 m long vine initially inclined at an angle of 33.0° with the vertical. (a) What is his speed at the bottom of the swing if he starts from rest?(b) What is his speed at the bottom of the swing if he pushes off with a speed of 3.00 m/s?
physics
A heavy wooden block rests on a flat table and a high-speed bullet is fired horizontally into the block, the bullet stopping in it. How far will the block slide before coming to a stop? The mass of the bullet is 10.5 g, the mass of the block is 10.5 kg the bullet’s impact...
physics
A boy pulls a sled of mass 5.0 kg with a rope that makes an 60.0° angle with respect to the horizontal surface of a frozen pond. The boy pulls on the rope with a force of 10.0 N; and the sled moves with constant velocity. What is the coefficient of friction between the sle...
physics
A COPPER BLOCK ,MASS 500g AND AT 200 DEGREES CELCIUS GIVES OUT ENERGY AT AN AVERAGE RATE OF 50W. (i)what is temperature after 5 min ? (ii)how long will it take before its temperature drops to 50 degrees celcius
physics
how will the weight of a 20 kg object change if it was in a lift that accelerates at 4 m.s?
physics
Two billiaard balls rolls to one another under an angle of 45°. Ball A have a speed of 3m/s and follows a track along the positive x-axis. Ball B moves on a track towards the x-axis and comes from the left top corner with a speed of 2m/s. Calculate the speeds and the direc...
physics
The MASS OF A SATELLITE IS 2000Kg .DETERMINE THE WEIGHT OF OF THE THE SATELLITE WHEN IT IS (i)resting on the earth (ii) 1000km above earth surface
Physics
A spring with a force constant of 4.5×104 N/m is initially at its equilibrium length. How much work must you do to stretch the spring 0.070 m? How much work must you do to compress it 0.070 m?
Physics
A kayaker paddles with a power output of 50.0 W to maintain a steady speed of 1.30 m/s. Calculate the resistive force exerted by the water on the kayak. If the kayaker doubles her power output, and the resistive force due to the water remains the same, by what factor does the ...
Physics
An arrow with a mass of 30g is shot straight up to a height of 130m what is the arrow's initial velocity?
physics
During a particular thunderstorm, the electric potential difference between a cloud and the ground is Vcloud - Vground = 4.3 108 V, with the cloud being at the higher potential. What is the change in an electron's electric potential energy when the electron moves from the ...
Physics
the ski boat is traveling at 15 m/s and the tension in the rope is 80 N. If the boat does 3500 J of work on the skier in 54.6 m, what is the angle between the tow rope and the center line of the boat?
Physics
At an amusement park, a swimmer uses a water slide to enter the main pool. The swimmer slides without friction, and descends through a vertical height of 2.89 m. Find the swimmer's speed at the bottom of the slide if she starts with an initial speed of 0.870 m/s.
Physics
The instant before a batter hits a .14 KG baseball, the velocity of the ball is 45 meters per second west. The instant after the batter hits the ball, the ball's velocity is 35 meters per second eat. The bat and ball are in contact for 1.0 x 10 ^-2 second. How do I determi...
Physics
The instant before a batter hits a .14 KG baseball, the velocity of the ball is 45 meters per second west. The instant after the batter hits the ball, the ball's velocity is 35 meters per second eat. The bat and ball are in contact for 1.0 x 10 ^-2 second. How do I determi...
Physics
A person walks 24.0° north of east for 2.80 km. How far would another person walk due north and due east to arrive at the same location?
Physics
What is the equation for work?
Physics
Initially sliding with a speed of 2.3 m/s, a 2.0 kg block collides with a spring and compresses it 0.41 m before coming to rest. What is the force constant of the spring?
Physics
A 70 kg bicyclist rides his 7.8 kg bicycle with a speed of 14 m/s. How much work must be done by the brakes to bring the bike and rider to a stop? How far does the bicycle travel if it takes 3.5 s to come to rest?
Physics
How far from the center of the earth must a person be located in space so t hat his/her weight would be the same as when he/she is standing on the moon?
Physics
A 1900kg car starts from rest and drives around a flat 56-m-diameter circular track. The forward force provided by the car's drive wheels is a constant 1000N. a. What is the magnitude of the car's acceleration at t=13s? b. What is the direction of the car's acceler...
Physics
You raise a bucket of water from the bottom of a deep well. If your power output is 108 W, and the mass of the bucket and the water in it is 7.00 kg, with what speed can you raise the bucket? Ignore the weight of the rope.
Physics
An ice cube is placed in a microwave oven. Suppose the oven delivers 135 W of power to the ice cube and that it takes 30200 J to melt it. How long does it take for the ice cube to melt?
College Physics**
A student goes to planet x and wants to determine the gravity there. The student knows from physics lab that they can use Atwood's machine to determine gravity. The student places a 100g mass and a 110g mass at the end of a string and hangs it over a pulley. The student pl...
physics
How much energy is produced when the sun converts one kg of hydrogen into helium?
physics 101
A 72.9 kg man is standing on a frictionless ice surface when he throws a 1.6 kg book at 11 m/s.
physics
A 0.16-g spider hangs from the middle of the first thread of its future web. The thread makes an angle 7.2* with the horizontal on both sides of the spider. (A) What is the tension in the thread? (B) If the angle made by the thread had been less than 7.2*, would its tension ha...
physics
A 380 turn solenoid of length 32.0 cm and radius 3.10 cm carries a current of 4.80 A. Find the following. (a) the magnetic field strength inside the coil at its midpoint mT (b) the magnetic flux through a circular cross-sectional area of the solenoid at its midpoint T ·...
Physics
Three equal charges q form an equilateral triangle of side a. Find the potential at the center of the triangle. Express answer in terms of the variables a, q and Coulomb constant k.
Physics
Two point charges, 5.0 µC and -2.0 µC, are placed 5.0 cm apart on the x axis, such that the -2.0 µC charge is at x = 0 and the 5.0 µC charge is at x = 5.0 cm. At what point(s) along the x axis is the electric field zero? I'm not exactly sure how i s...
physics
A current I = 16 A is directed along the positive x-axis and perpendicular to a magnetic field. A magnetic force per unit length of 0.15 N/m acts on the conductor in the negative y-direction. Calculate the magnitude and direction of the magnetic field in the region through whi...
Physics
The two masses (m1 = 5.0 kg and m2 = 3.0 kg) in the Atwood's machine shown in Figure 10-23 are released from rest, with m1 at a height of 0.91 m above the floor. When m1 hits the ground its speed is 1.5 m/s. Assume that the pulley is a uniform disk with a radius of 12 cm. ...
Physics
A solid disk rolls along the floor with a constant linear speed v. (a) Find the fraction of its total kinetic energy that is in the form of rotational kinetic energy about the center of the ball. Krot/Ktotal = ?
Physics
The two masses (m1 = 5.0 kg and m2 = 3.0 kg) in the Atwood's machine shown in Figure 10-23 are released from rest, with m1 at a height of 0.87 m above the floor. When m1 hits the ground its speed is 1.4 m/s. Assume that the pulley is a uniform disk with a radius of 12 cm. ...
Physics
When a ceiling fan rotating with an angular speed of 1.65 rad/s is turned off, a frictional torque of 0.263 N·m slows it to a stop in 4.75 s. What is the moment of inertia of the fan?
Physics Tough question!
A pond has the shape of an ice cream cone with the tip slices off and has a depth of 5.00m. The atmospheric pressure above the pond is 1.01 *10^5 Pa. The circular top surface (radius = R2) and circular bottum (radis = R1) of the pond are both parrallel to the ground. The angle...
physics
in a daring rescue by helicopter, two men with a combined mass of 172 kg are lifted to safety. a)If the helicopter lifts the menstraight up with constant acceleration, is the tension in the rescue cablegreater than, less than, or equalto the combined weight of the men? Explain...
Physics
Pulling the string on a bow back with a force of 28.7lbs, an archer prepares to shoot an arrow. If the archer pulls in the center of the string, and the angle between the two halves is 138 degrees, what is the tension in the string?
Physics
A 50.0-kg person takes a nap in a backyard hammock. Both ropes supporting the hammock are at an angle of 15.0degrees above the horizontal. Find the tention of the ropes.
Physics
The magnification of a convex mirror is +0.65X for objects 2.8 m from the mirror. What is the focal length of this mirror?
physics - PLEASE HELP
A person whose eyes are H = 1.62 m above the floor stands L =2.24m in front of a vertical plane mirror whose bottom edge is 43 cm above the floor. What is the horizontal distance x to the base of the wall supporting the mirror of the nearest point on the floor that can be seen...
Physics
A cyclist starts from rest and pedals so that the wheels make 7.7 revolutions in the first 5.1 s. What is the angular acceleration of the wheels (assumed constant)?
Physics
A ski trail makes a vertical descent of 78.0 m (as shown in the figure below ). A novice skier, unable to control his speed, skis down this trail and is lucky enough not to hit any trees. If the skier is moving at 12.1 m/s at the bottom of the trail, calculate the total work d...
Physics 1111: Orbitals and Distance
A planet has two satellite moons. Moon X has an orbital period of 2.27 days. Moon Y has an orbital period of about 3.40 days. Both moons have nearly circular orbits. Use Kepler's third law to find the distance of each satellite from the planet's center. The planet'...
physics
a basketball of mass 0.5 kg is dropped from restfrom a height of 1.34m.it rebounds to a height of 0.6m. how much mechanicalenergy was lost during the collision with the floor?
physics
In a daring rescue by helicopter, two men with a combined mass of 172-kg are lifted to safety. (a) If the helicopter lifts the men straight up with constant acceleration, is the tension in the rescue cable greater than, less than, or equal to the combined weight of the men? Ex...
PHYSICS
Two 2.5-cm-diameter electrodes with a 0.10-mm-thick sheet of Teflon between them are attached to a 9.0V battery. Without disconnecting the battery, the Teflon is removed. a) What is the charge before the Teflon is removed? Q= C b) What is the potential difference before the Te...
Physics
Pulling the string on a bow back with a force of 28.7 lb, an archer prepares to shoot an arrow. If the archer pulls in the center of the string, and the angle between the two halves is 138*, what is the tension in the string?
Physics
Pulling up on a rope, you lift a 4.35-kg bucket of water from a well with an acceleration of 1.78m/s^2. What is the tension in the rope?
physics
Calculate the magnetic field at the center of a wire square that consists of 120 loops and has sides of length 5 cm and carries a current of 0.7 A.
Physics
A 15 μA current starts flowing in a circuit with a 3.0 μF capacitor of area 40 cm^2 at t = 0 s.(a) How fast is the voltage across the capacitor plates changing at t = 0 s? (b) Use the result of (a) to calculate the following at t = 0 s.(i) dφB/dt in V.m/s (ii) d...
physics
How many coulombs of positive charge are in 3.8 mol of O2 gas?
Physics
A rectangular piece of gold is 3.1 cm long and 3 cm wide. Resistivity of gold is 2.4*10^-8. How deep is the piece when it displays a resistance of R = 1.65 μω for a current that flows along the depth-direction? I used R=(p*l)/A and solved for l. I got the answer wron...
physics
How do I go about in solving this? A spy satellite is in circular orbit around Earth. It makes one revolution in 6.01 hours. (a) How high above Earth's surface is the satellite? ___ km (b) What is the satellite's acceleration? ___m/s2
physics
(how do I go about solving this, i know i need to conver 88days to secs and that would be 126,720. but I don't where to go from there, help please) What is the average linear speed of Mercury about the Sun? (The distance from the Sun to Mercury is 5.80 1010 meters. The orb...
physics
A woman pulls a 23 kg suitcase using a rope attached to the suitcase at an angle of 38 degrees to the horizontal. The coefficient of static friction of the suitcase with the floor is 0.3 and the coefficient of kinetic friction is 0.2. a) Draw a situation and a force diagram of...
Physics
Hi, I have the following question: 1. The index of refraction for a prism is given by the equation: n = 1.58 − (6.41 x 10^4)λ where λ is the wavelength in meters. Light is incident at 28°. Find the exit angle ß for light of a) 800 nm b) 633 nm c) 540 ...
physics
You want to swim straight across a river that is 76m wide. You find that you can do this if you swim 28 degrees upstream at a constant rate of 1.7m/s relative to water. At what rate does the river flow? The angle is measure from the river bank (directly upstream is 0 degrees w...
Physics
A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44° from the neutron's initial direction. The neutron's initial speed is 7.0 ...
Physics
A neutron collides elastically with a helium nucleus (at rest initially) whose mass is four times that of the neutron. The helium nucleus is observed to rebound at an angle θ'2 = 44° from the neutron's initial direction. The neutron's initial speed is 7.0 ...
Physics
The Place you get your haircut has two nearly parallel mirrors 5.0m apart. As you sit in the chair, yoru head is 2.0 m from the nearer mirror. Looking toward this mirror, you first see your face and then, farther away, the back of your head. ( The mirrors need to be slightly n...
physics
You walk 80 m to the north, then turn 60 degrees to your right and walk another 45 m. Determine the direction of your displacement vector. Express answer relative to east :)
physics
an object travels in a straight line at a constant acceleration for 6 seconds.in the first 2 seconds it travels 18 metres and in entire 6 seconds it covers 102 metres. find the acceleration.
physics
A boy throws a rock with an initial velocity of 2.47 m/s at 30.0 degrees above the horizontal. How long does it take for the rock to reach the maximum height of its trajectory?
physics
A plane flies directly from city A to B, which are separated by 2300mi. From A to B, the place flies into a 65mi/hr headwind. ON the return trip from A to B, the wind velocity is unchanged. The trip from B to A takes 44 min less than the trip from A to B. What is the airspeed ...
physics
skydiver not in freefall because wind resistance prevents her from accelerating indefinitely. If skydiver weighs 750N whats the force due to wind resistance after reaches terminal velocity but before her parachute opens traveling at 200 km.hr
Physics
A 63 kg canoeist stands in the middle of her 19 kg canoe. The canoe is 3.0 m long, and the end that is closest to land is 2.5 m from the shore. The canoeist now walks toward the shore until she comes to the end of the canoe. a. When the canoeist stops at the end of her canoe, ...
Physics
A person swings a 0.33 kg tether ball tied to a 5.4 m rope in an approximately horizontal circle. (a) If the maximum tension the rope can withstand before breaking is 11 N, what is the maximum angular speed of the ball?
Physics
Okay, I saw this one previously posted, but the answer it kept leading me to was wrong. A sports car of mass 1400kg (including the driver) crosses the rounded top of a hill (radius 88m) at 23 m/s. Find the normal force exerted by road on the car. I thought that the normal forc...
Physics
Light from a sodium lamp ( wavelength= 589 nm) illuminates a narrow slit and is observed on a screen 75 cm behind the slit. The dstance between the first and third dark fringes is 7.5 mm. What is the width (in mm) of the slit? Cant seem to get the answer =/
college physics
A rope is used to pull a 3.57 kg block at constant speed 5.10 m along a horizontal floor. The force on the block from the rope is 6.82 N and is directed 15° above the horizontal. (a)What is the work done by the rope's force? (b) What is the increase in the thermal ener...
physics
Any dielectric material other than vacuum has a maximum electric field that can be produced in the dielectric material before it physically or chemically breaks down and begins to conduct. This maximum electric field is called dielectric strength. The dielectric strength for a...
physics
How does the resistance of a piece of metal change if both its length and its diameter are reduced to one half their original values? .. im confused because i dont know what the shape of the metal is...please help!
PHYSICS
A rectangular piece of gold is 3.6 cm long and 3.5 cm wide. How deep is the piece when it displays a resistance of R = 1.51 ìù for a current that flows along the depth-direction? --- p is found in a table...right? and then.. R=pl/A R=pl/(2dw+2wl+2dl) then solve f...
PHYSICS
How can an election be particle and a wave at the same time?
physics
A 9600 kg boxcar traveling at 15 m/s strikes a stationary second car. The two stick together and move off with a speed of 7.0 m/s. What is the mass of the second car?
Physics
There are two particles of charge +Q located on the top left and bottom right corners of a square. What is the direction of the net electric field at the point on the bottom left corner of the square? And also what would be the general equation be for finding the potential ene...
physics
How will the weight of 20kg change if it was in a lift that accelerates at 4m/s
Physics
An electric field exerts a force of 3.00 E-4 N on a positive test charge of 7.20 E-4 C. The magnitude of the field at the location of the charge is?
physics
There are two conducting spheres of different sizes, both with the same negative charge. If they are connected with a conducting wire, the charge would therefore flow from the smaller to the larger. Am I correct? Thanks!
physics
If there are two conducting spheres of different sizes, but of a same negative charge and they are connected with a conducting wire, does the charge flow from one sphere to the other?
physics
a car is moving at 40km per hour what is the velocity in meters per second?
Physics (Heat Engines)
21. A heat engine operates in a cycle between temperatures 700 K and 400 K. The heat input to the engine during each cycle is 2800 J. What is the maximum possible work done by the engine in each cycle? (A) 1200 J (B) 1600 J (C) 2100 J (D) 2800 J (E) 4400 J I believe that the a...
PHYSICS
In the early 1900s, Robert Millikan used small charged droplets of oil, suspended in an electric field, to make the first quantitative measurements of the electron’s charge. A 0.67-um-diameter droplet of oil, having a charge of +e, is suspended in midair between two horiz...
physics
A person swings a 0.33 kg tether ball tied to a 5.4 m rope in an approximately horizontal circle. (a) If the maximum tension the rope can withstand before breaking is 11 N, what is the maximum angular speed of the ball? --I figured out the rest of the problem and i just need h...
physics
ok so dr= 2i + 3j while F= 5i + 2j It wants me to find the work. now i know w=Fxdr. what i want to know is why when you take the dot product of both, you get a different answer compared to when you just multiply the magnitudes.
Physics
A uniformly charged sphere has a potential on its surface of 410 V. At a radial distance of 20 cm from this surface, the potential is 150 V. The Coulomb constant is 8.99 × 109 N · m2/C2.What is the radius of the sphere? Answer in units of m.
physics
given 1000 mL of helium at 15degrees C and 763mmHg, determine its volume at -6degrees C and 420 mmHg. my friend said she got 1.68 x 10^3 mL help, I have no idea how she got it
physics
a tank of ideal gas is sealed off at 20 degrees C and 1.00 atm pressure. What will be the pressure (in kPa and mmHg) in the tank if the gas temperature is decreased to -35degrees C ? the book answer is 82kPa = 6.2 x10^2 mmHg can you help me figure out how the book got this ans...
Physics
∆L = á Lo ∆T (25.054 cm - 25.000 cm) = á (25.000 cm)(102°C - 25°C) .054 = a(1925) 1925/.054 = 35648.14 Did I solve the equation correctly?
physics
A positive point charge = 2.1×10−5 is fixed at the origin of coordinates, and a negative point charge = −5.4×10−6 is fixed to the axis at . abeer abdullah Part A Find the location of the place along the axis where the electric field due to these t...
Physics
An air-filled parallel plate capacitor has a plate separation of b = 0.58 cm, and an area A = 280 mm2. Find its capacitance
Physics
A rectangular piece of gold is 3.8 cm long and 2.5 cm wide. How deep is the piece when it displays a resistance of R = 1.35 μω for a current that flows along the depth-direction?
Physics
A simplified model for an erythrocyte is a spherical capacitor with a positive inner surface of area A and a membrane of thickness b. Use potential difference of 86 mV across the membrane and a dielectric constant K = 5.0. If the capacitance of the membrane is C = 0.2 pF, wha...
Physics
Any dielectric material other than vacuum has a maximum electric field that can be produced in the dielectric material before it physically or chemically breaks down and begins to conduct. This maximum electric field is called dielectric strength. The dielectric strength for ...
Physics
A space station is shaped like a ring and rotates to simulate gravity. If the radius of the space station is 120 m, at what frequency must it rotate so that it simulates Earth's gravity? [Hint: The apparent weight of the astronauts must be the same as their weight on Earth.]
Physics
What's the tangential acceleration of a freely swinging pendulum when it makes an angle θ with the vertical?
Physics
Calculate the magnitude of the linear momentum for the following cases. the Earth (mass = 5.98*1024 kg) moving with an orbital speed equal to 2.98*10^4 m/s. so i did 5.98*10^24 times 2.98*10^4=1.78204 × 10^29 But homework website doesn't accept this answer...is there...
Physics
Two shuffleboard disks of equal mass, one orange and the other yellow, are involved in a perfectly elastic glancing collision. The yellow disk is initially at rest and is struck by the orange disk moving initially to the right at 5.60 m/s. After the collision, the orange disk ...
physics
What is the acceleration of the system if both blocks have a mass of 5.0 kg, and the coefficient of kinetic friction is 0.11? [___/4] (b) Determine the tension in the rope.
physics
using the strap at an angle of 31° above the horizontal, a Grade 12 Physics student, tired from studying, is dragging his 15 kg school bag across the floor at a constant velocity. (a) If the force of tension in the strap is 51 N, what is the normal force on the bag? image ...
Physics
A 100kg mass is connected to a 200kg mass by a massless rope. The two masses rest on a frictionless surface. A (massless)rope is then attached to the 200kg mass, and is pulled. The two mass system accelerates. What is the relationship between the two tensions? _THANK YOU
physics
a 1.50 kg book is sliding along a rough horizontal surface. At point A it is moving at 3.21 m/s, and at point B it has slowed to 1.25m/s. 1.) How much work was done on the book between A and B? 2.) If -0.750 J of work is done on the book from B to C, how fast is it moving at p...
PHYSICS
A -3.0 nC charge is on the x-axis at x = -10 cm and a +4.0 nC charge is on the x-axis at x = 20 cm. At what point or points on the y-axis is the electric potential zero?
PHYSICS
A stereo amplifier creates a 3.5 V potential difference across a speaker. To double the power output of the speaker, the amplifier's potential difference must be increased to: A. 7.0 V B. 9.9 V C. 12 V D. 4.9 V
Physics
In a fit of pique, the Canadians fire a cannonball due south from vancouver (lat 49.2 degrees N) at a randomly picked city (39.4 degrees N). Assuming the cannonball takes 48 minutes to get there, by how far and in what direction will the cannonball miss?
Physics
What is the instantaneous acceleration (both magnitude and direction) due to the coriolis force on an object moving at 160 m s^-1 to the west located at 17 degrees south, 86 degrees west?
Physics
Your airplane leaves 20 degrees N(linear velocity= 845 nm/h) heading to a point due north at 25 degrees north (linear velocity = 815 nm/h). You set the autopilot dor due north and go to sleep. If your flight time is 30 minutes, how far off and in what direction are you if you ...
Physics
At a spot in the ocean, the surface irradiance is 7.8*10^16 photons and k=.14 m^-1. At what depth does the euphotic zone end?
Physics
On a bright sunny day the irradiance on the surface of the ocean is 1.6*10^17 photons cm^-2 s^-1. If k=0.02 m^-1 a) How much light is left (irradiance) at 15 m? b)at 75m?
physics
if velocity vector is changing but speed is constant, can there still be work
physics
can someone please take me step by step on this problem a swimers speed in still water is 1.35m/s if the current speed is 0.60m/s and the river is 106.68 meters wide. how long will it take to cross the river
Physics.
The figure below shows an arrangement of 15 identical disks that have been glued together in a rod-like shape of length L = 1.4500 m and (total) mass M = 135.000 g. The arrangement can rotate about a perpendicular axis through its central disk at point O. (a) What is the rotat...
physics
can someone take me through this vector combination question please an airplane is observed to be flying at a speed of 600km/h. The planes nose points west. The winds velcoity is 40km/h 45degrees west of south. Find the air planes velocity relative to the ground.
Physics
A particle of mass m is shot with an initial velocity vector v i and makes an angle θ with the horizontal, as shown below. The particle moves in the gravitational field of the Earth. (makes a shape of a parabola)Find the angular momentum of the particle about the origin w...
physics
you ca obtain four 20 ohms resistors from te stock room. ow can you aciee a resistance of 50 ohms uder these circumstances
Physics
A wheel with an I of 5.00 kg-m^2 starts at rest & accelerates under a constant torque of 3 N-M for 8 seconds. what is the wheel's rotational ke at the end of 8 seconds?
Physics
a hoop of radius .5 m & mass .2 kg is released from rest & rolls down an inclined plane. how fast is it moving when it has dropped a vertical distance of 3 m?
AP Physics
A merry-go-round rotates at the rate of.2rev/s with an 80kg man standing at a point 2m from the axis ofrotation. (A)What is the new angular speed when the man walksto a point 1m from the center? Assume that the merry-go-round is a solid 25kg cylinder of radius of 2m. B. calcul...
physics
During a ski race, Kate uniformly accelerated at 3.15m/s^2 for 100meters. She then maintained this velocity for another 100m. she then uniformly decelerated at 6m/s^2 for 2 seconds. she accelerates back to her maximum velocity over the next 200meters in 16 seconds. she then tr...
Physics
An empty rubber balloon has a mass of 0.012kg. the balloon is filled with helium at 0 degrees celcius, 1 atm pressure, and a density of 0.179 kg/m3. the filled balloon has a radius of 0.5 m. a)what is the magnitude of the buoyant force acting on the balloon? b)what is the magn...
physics
if a particle has work of 8J and doubles its speed. how much work it has done? Can we still determine work in this problem without mass
physics
which is more work pushing with 115N over 15 m or lifting 20N 10meters
physics
how far will 350 J raise a 7 kg mass?
Physics(Please help)
What characteristic of water would you be investigating when you place a small drop of water on wax paper and when you try to float a paper clip in water? I know that the paper clip does not float and that the drop of water rolls around on the paper.
physics
In the operating Room, anesthesiologists use mass spectrometers to monitor the respiratory gases of patients undergoing surgery. One gas that is often monitored is the anesthetic isoflourane (molecular mass = 3.06 · 10−25 kg). In a spectrometer, a singly ionized m...
Physics
What characteristic of water would you be investigating when you place a small drop of water on wax paper and when you try to float a paper clip in water? I know that the paper clip does not float and that the drop of water rolls around on the paper.
As Physics
Please help me with this calculation __________________ <- A vibrating wire which is 4cm long Diameter= 0.0002m Frequency= 2500Hz density of carbon steel= 7700kg/m3 How do i find the tension of this wire? This is some of the equations which we should be using: v= √T/&...
Physics
How will the weight of a 20kg object change in an elevator if the elevator moves downwards with 4 m.s?
Physics
Can the following equation be used to solve the question? R = ρ L / A ; find L.. or is there another way? Question: A rectangular piece of gold is 2.2 cm long and 2.4 cm wide. How deep is the piece when it displays a resistance of R = 1.06 μω for a current that ...
Physics
A simplified model for an erythrocyte is a spherical capacitor with a positive inner surface of area A and a membrane of thickness b. Use potential difference of 94 mV across the membrane and a dielectric constant K = 5.0. If the capacitance of the membrane is C = 0.15 pF, wha...
Physics
I don't know how to approach this question... Any dielectric material other than vacuum has a maximum electric field that can be produced in the dielectric material before it physically or chemically breaks down and begins to conduct. This maximum electric field is called ...
physics
A T-bar tow is planned in a new ski area. At any one time, it will be required, to pull a maximum of 80 skiers up a 600-m slope inclined at 15 degrees above the horizontal at a speed of 2.5 m/s. The coefficient of kinetic friction between teh skiers skis and the snow is typica...
physics
You are designing a game for small children and want to see if the ball’s maximum speed is sufficient to require the use of goggles. In your game, a 15.0-g ball is to be shot from a spring gun whose spring has a force constant of 600 N/m. The spring will be compressed 5.0...
physics
Water flows over Victoria Falls, which is 128 m high, at a rate of 1.4 x 106 kg/s. If half the potential energy of this water were converted into electric energy, how much electric power would be produced by these falls?
Physics
The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 15 g nail when it is struck by a 550 g hammer moving with an initial speed of 5.1 m/s.
College Physics
Part A) A 2.2 kg rock is released from rest at the surface of a pond 1.8 m deep. As the rock falls, a constant upward force of 5.0 N is exerted on it by water resistance. Let y=0 be at the bottom of the pond. Calculate the nonconservative work, Wnc , done by water resistance o...
Maths
When Professor Sum was asked by Mr. Little how many students in his classes, he answered. “All of them study either languages, or not at all. One-half of them study languages only. One-fourth of them study French, one-seventh study physics only, and 20 do not study at all...
physics
A balloonist, riding in the basket of a hot air balloon that is rising vertically with a constant velocity of 10.1 m/s, releases a sandbag when the balloon is 43.4 m above the ground. Neglecting air resistance, what is the bag's speed when it hits the ground? Assume g = 9....
physics
A skier with a mass of 70 kg starts from rest and skis down an icy (frictionless) slope that has a length of 52 m at an angle of 32° with respect to the horizontal. At the bottom of the slope, the path levels out and becomes horizontal, the snow becomes less icy, and the s...
Physics
A sled is initially given a shove up a frictionless 24.0° incline. It reaches a maximum vertical height 1.10 m higher than where it started. What was its initial speed?
Physics
Two objects moving with a speed v travel in opposite directions in a straight line. The objects stick together when they collide, and move with a speed of v/10 after the collision. (a) What is the ratio of the final kinetic energy of the system to the initial kinetic energy? 1...
Physics
A sled is initially given a shove up a frictionless 24.0° incline. It reaches a maximum vertical height 1.10 m higher than where it started. What was its initial speed?
Physics
The collision between a hammer and a nail can be considered to be approximately elastic. Estimate the kinetic energy acquired by a 15 g nail when it is struck by a 550 g hammer moving with an initial speed of 5.1 m/s.
Physics
What is the apparent weight of a 75 KG astronaut 4200 km from the center of the earth's moon in a space vehicle.a) moving at constant velocity, and b) accelerating toward the moon at 209 m/s? state the direction in eachcase
physics
In the high jump, Fran's kinetic energy is transformed into gravitational potential energy without the aid of a pole. With what minimum speed must Fran leave the ground in order to lift her center of mass 1.95 m and cross the bar with a speed of 0.70 m/s?
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