Wednesday
September 2, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
A small wooden block with mass 0.800kg is suspended from the lower end of a light cord that is 1.52m long. The block is initially at rest. A bullet with mass 0.0126kg is fired at the block with a horizontal velocity v0. The bullet strikes the block and becomes embedded in it. ...
Thursday, March 12, 2015 by Katie

Physics
At New York City, the earth's magnetic field has a vertical component of that points downward (perpendicular to the ground) and a horizontal component of that points toward geographic north (parallel to the ground). What are the magnitude and direction of the magnetic ...
Thursday, March 12, 2015 by Aggie

Physics
A 100 lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and the incline is 0.10. Find (a) the force exerted by the ...
Thursday, March 12, 2015 by Emily

Physics
What kind (s) of particles make up (a) gaseous compounds, (b) liquid compounds, and (c) solid compounds?
Thursday, March 12, 2015 by Channing

physics
How do I: a.) find the energy in a 3.50x10^-5f parallel plate capacitor if it holds 2.00x10^-3c of charge b.)find the voltage between the plates c.)determine the new voltage after doubling the stored energy
Thursday, March 12, 2015 by Anonymous

physics
The heaviest invertebrate is the giant squid, which is estimated to have a weight of about 0.35 tons spread out over its length of 38 feet. What is its weight in newtons?
Thursday, March 12, 2015 by Anonymous

Physics
Assume you have a rocket that requires a change in velocity of DeltaV=9.6km/s . There are two options for the propulsion system --- 1. chemical and 2. electric --- each with a different specific impulse. Using the setting of g0 =9.81m/s^2 to calculate the propellant fraction ...
Thursday, March 12, 2015 by Janet

Physics
Assume you have a rocket that requires a change in velocity of ¦¤V¡Ö9.6km/s . There are two options for the propulsion system --- 1. chemical and 2. electric --- each with a different specific impulse. Using the setting of g 0 =9.81m/s^2 to calculate ...
Thursday, March 12, 2015 by Janet

Physics
What is the centripetal acceleration in meters per second squared of a point on the rim of a circle with a radius of 0.45 meters and turning at a rate of 1200 rpm?
Thursday, March 12, 2015 by George

Physics
A diver running 1.8 m/s dives out horizontally from the edge of the cliff and 3 s later he reaches the water below. (a) Calculate the resultant velocity (with direction) of the diver just before he hits the water. (10) (b) How high is the cliff, and how far from its base did ...
Thursday, March 12, 2015 by Tina

Physics
A body of mass m is suspended from a spring with spring constant k and the spring is stretched 0.1. If two identical bodies of mass m/2 are suspended from a spring with the same spring constant k, how much will the spring stretch? Explain your answer. The first case is when ...
Thursday, March 12, 2015 by Justin

Physics
There is a band who uses 10000 W to radiate sound energy in all directions. What was the intensity of sound 10 meters from this speaker? What was the sound level in dB at a distance of 10 m? At what distance from the speaker was the sound level 100 dB?
Thursday, March 12, 2015 by Josh

Physics
The distance between two consecutive nodes of a standing wave is 19.2 cm. The hand generating the pulses moves up and down through a complete cycle 2.59 times every 7.44 s. Find the velocity of the wave. Answer in units of m/s.
Wednesday, March 11, 2015 by Lauren

Physics
What is the volume of water at 95 degrees Celcius if at 5 degrees Celcius the water is 5.56L?
Wednesday, March 11, 2015 by Scott

Physics
A 100 lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and the incline is 0.10. Find (a) the force exerted by the ...
Wednesday, March 11, 2015 by Emily

Physics
A raft measures 1.7m x 0.67m x 0.14m, and it has a mass of 13.5kg. What is the maximum mass that the raft can hold and still stay afloat
Wednesday, March 11, 2015 by Scott

physics
a train stopping distance, even when full emergency brakes are engaged, is 1.3 km. if the train was travelling at an initial velocity of 90 km/h [forward], determine its acceleration under full emergency brakes.
Wednesday, March 11, 2015 by raman

physics
A light beam in air enters a block of transparent material at an angle of 28.0˚ with respect to the normal. After refraction it makes an angle of 19.0˚ with respect to the normal. a) Find the index of refraction of the material. b) In a second setting, the light ...
Wednesday, March 11, 2015 by Amanda

physics
A 2.40 kg mess kit sliding on a frictionless surface explodes into two 1.20 kg parts: 3.78 m/s, due north, and 5.28 m/s, 32.8° north of east. What is the original speed of the mess kit?
Wednesday, March 11, 2015 by Shane

Physics
A 75kg firefighter slides down a 2.5m fire pole from rest. It takes the firefighter 1.8s to reach the ground. If the firefighter bends his knees when he reaches the ground such that his centre of mass mives 41cm while coming to a stop, what must the normal force of the ground ...
Wednesday, March 11, 2015 by Anonymous

Ap physics
Rotational Motion/Torque The question says that "A 60.0kg painter is on a uniform 25 kg scaffold supported from above by ropes. There is a 5.0 kg pail of paint to one side, as shown. How far from the left end of the scaffold should the painter stand such that the right ...
Wednesday, March 11, 2015 by Kayla

Physics
A pilot wants to fly directly north to an airport 500 km away. His speed relative to the air is 100 km/h. Howevere there is a 40 km/h cross wind blowing from west to east. At what angle relative to the south north direction should he fly to arrive at the distant airport? How ...
Wednesday, March 11, 2015 by Alex

Physics
A 75kg firefighter slides down a 2.5m fire pole from rest. It takes the firefighter 1.8s to reach the ground. If the firefighter bends his knees when he reaches the ground such that his centre of mass mives 41cm while coming to a stop, what must the normal force of the ground ...
Wednesday, March 11, 2015 by Anonymous

Physics
A 75kg firefighter slides down a 2.5m fire pole from rest. It takes the firefighter 1.8s to reach the ground. If the firefighter bends his knees when he reaches the ground such that his centre of mass mives 41cm while coming to a stop, what must the normal force of the ground ...
Wednesday, March 11, 2015 by Anonymous

Physics
A 100 lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and the incline is 0.10. Find (a) the force exerted by the ...
Wednesday, March 11, 2015 by Emily

physics
The angular position of a flywheel is given by theta=(2+5t+2t^2)rad . find the angular speed and acceleration at 3^rd second after the motion had been started.
Wednesday, March 11, 2015 by help

physics
2) Two objects are initially the same height above the ground. Simultaneously, one is released from rest and the other is shot horizontally with an initial speed of 2.5 m/s. The two objects collide after falling 20.0 m. How far apart were the objects initially?
Wednesday, March 11, 2015 by Anonymous

physics
2)Two objects are initially the same height above the ground. Simultaneously, one is released from rest and the other is shot horizontally with an initial speed of 2.5 m/s. The two objects collide after falling 20.0 m. How far apart were the objects initially?
Wednesday, March 11, 2015 by Anonymous

physics
two blocks of each mass m=3.75kg are fastened to the ceiling of an elevator. If the elevator accelerates upward at 1.6m/s^2. Find the tension in T1 and T2 in each upper and lower rope
Wednesday, March 11, 2015 by Rebecca

Physics
A mover pushes a 60 lb box 30 ft along a level floor at constant speed with a force directed 45 degrees below the horizontal. If the coefficient of kinetic friction is 0.20, how much work does the mover do on the box? ...Is this one of those trick questions where the work is 0?
Wednesday, March 11, 2015 by Emma

physics
a force of 10N acts on an object and raises its speed from 0 to 5 m/s in 10s.calcuate the average power.
Wednesday, March 11, 2015 by doc

Physics
A 100 lb block of ice slides down an incline 5.0 ft long and 3.0 ft high. A worker pushes up on the ice parallel to the incline so that it slides down at constant speed. The coefficient of friction between the ice and incline is 0.10. Find the force exerted by the worker. (I&#...
Wednesday, March 11, 2015 by N

Physics
You count 9 cycles across 8.1 time divisions on an oscilloscope screen. The time sweep is set to 60 micro seconds. The voltage peak is measured to be 22 volts. What is the frequency? You plot some data of Real Frequency versus HP Dial Frequency and get a linear trend of y = 1....
Wednesday, March 11, 2015 by Isa

Physics
1. Given t1/2 to be 0.0137 seconds, how long should it take to reach 87.5% of maximum charge?
Tuesday, March 10, 2015 by B

Physics
The coefficient of static friction between the m = 3.75-kg crate and the 35.0° incline of the figure below is 0.320. What minimum force vector F must be applied to the crate perpendicular to the incline to prevent the crate from sliding down the incline?
Tuesday, March 10, 2015 by Ryan

Physics help please!
1. Given t1/2 to be 0.0137 seconds, how long should it take to reach 87.5% of maximum charge? 2. Let's say you measure t1/2 to be 0.0137 seconds and the resistance in the circuit is 99 Ohms. Then what is the capacitance in micro Farads? 3.q = qmax(1 - e -t / τ) Using ...
Tuesday, March 10, 2015 by B

physics
*please walk me through equation The patellar tendon attaches to the tibia at the tibial tuberosity. The tibial tuberosity is 7 cm from the center of the knee joint. The patellar tendon pulls at an angle of 35deg to the line passing through the tibial tuberosity and the center...
Tuesday, March 10, 2015 by eagle1

Physics
Zak, helping his mother rearrange the furniture in their living room, moves a 58.3 kg sofa 7.7 m with a constant force of 25 N. What is the work done by Zak on the sofa? Neglect friction. Answer in units of J. What is the average acceleration of the sofa? Answer in units of m/...
Tuesday, March 10, 2015 by monica :)

Physics
We want to find how much charge is on the electrons in a nickel coin. Follow this method. A nickel coin has a mass of about 5.7 g. a. Find the number of atoms in a nickel coin. Each mole (6.02 × 10^23 atoms) has a mass of about 57.9 g. Answer in units of atoms. b. Find ...
Tuesday, March 10, 2015 by Jess

Physics
A charge q1 = 5 µC is at the origin, and a charge q2 = 4 µC is on the x axis at x = 6 m. Find the force on charge q2 . The Colulomb constant is 8.98755 × 10^9 N·m^2/C^2. Answer in units of N.
Tuesday, March 10, 2015 by Jess

Physics
A strong lightning bolt transfers about 21.45 C to Earth. How many electrons are transferred? The elemental charge is 1.602 × 10^−19 C.
Tuesday, March 10, 2015 by Jess

physics
A plastic rod is rubbed against a wool shirt, thereby acquiring a charge of −4.9 µC. How many electrons are transferred from the wool shirt to the plastic rod? The elemental charge is 1.6 × 10−19 C.
Tuesday, March 10, 2015 by Bob

physics
You can estimate your distance from a lightning storm by watching for a lightning flash and then counting in one-second intervals using the general rule that you are 1 km away for every 3 s you count. Explain why this rule works. Estimate the distance from a lightning storm if...
Tuesday, March 10, 2015 by gal

Physics
If a mass of gasoline occupies 70.01 at 20°C, What is the volume at 35°C?
Tuesday, March 10, 2015 by Kram

Physics
An object floats in a liquid of density 1.2×10 kg/m3 with one quarter of its volume above the liquid surface. You are required to determine the density of the object
Tuesday, March 10, 2015 by Kram

physics
A system of 1216 particles, each of which is either an electron or a proton, has a net charge of -5.920×10-17 C. A)How many electrons are in this system (exactly)? B)What is the mass of this system (to three significant digits)?
Tuesday, March 10, 2015 by Samantha

Physics
Billy stands on a hill without slipping. In which direction is the force of friction acting?
Tuesday, March 10, 2015 by Hanna

Physics College
A heat engine operates in a Carnot cycle between 78.0°C and 340°C. It absorbs 22,000 J of energy per cycle from the hot reservoir. The duration of each cycle is 3.00 s. (a) What is the mechanical power output of this engine? (answer in kW) (b) How much energy does it ...
Tuesday, March 10, 2015 by Meena

physics
calculate the linear speed of a point on the record at the beginning and the end of the record that rotates at 33rev/min r1=7cm,r2=15cm
Tuesday, March 10, 2015 by selena

physics
A car's wheel of radius r=50cm goes through 5000rev in 1min. find the car's average angular velocity,and how far it travels along the ground in 1min. The linear speed v and angular speed w of the point of a rotating body are connected by the equation v=wr. where r is ...
Tuesday, March 10, 2015 by Sarah

Physics
Hi guys, I was just wondering if I'm heading in the right direction with this question. Thank you so much in advance for your time!! A loudspeaker emits energy at the rate of 56W , spread in all directions. What is the intensity of sound 18m from the speaker? Working out (...
Tuesday, March 10, 2015 by Kylie

physics
What design aspects of the snowmobile make it particulary useful for travel over ice and snow?
Tuesday, March 10, 2015 by chris

Physics
Hello to all the fantastic tutors! I'm stuck on this question, I was wondering if there is a way to solve this. A car horn emits 378Hz sound. If the car moves at 23m/s with its horn blasting, what frequency will a person standing in front of the car hear? What I've ...
Tuesday, March 10, 2015 by Tommy

physics
a car set out at noon to ride from point a to point b, and another car started at 2 pm on the same day to ride from point b to point a. they met on the road at 4:05 pm, and each car reached their destination at exactly the same time. at what time did the car arrive?(hint: both...
Tuesday, March 10, 2015 by steven

physics
4. A ball is thrown so that it just clears a 3m fence 18m away. If it left the hand 1.5m above the ground and at an angle of 60° with the horizontal, what was the initial velocity of the ball?
Tuesday, March 10, 2015 by steven

physics
a ball dropped from rest at a height of 50 m above the ground. (a) what is the speed just before it hits the ground? (b) how long does it take to reach the ground?
Tuesday, March 10, 2015 by sha

physics
a car moving at 30 m/s slows to a speed of 10 m/s in a time of 5 s. determine a.) the acceleration of the car (b). the distance it moves in the third second.
Tuesday, March 10, 2015 by sha

physics
You can estimate your distance from a lightning storm by watching for a lightning flash and then counting in one-second intervals using the general rule that you are 1 km away for every 3 s you count. Explain why this rule works. Estimate the distance from a lightning storm if...
Monday, March 9, 2015 by gal

physics
a 6 0 kg piece of aluminum at 645 degrees to celsius is combine with 1.0 kg of ice at -15 degrees Celsius in a thermally isolated calorimeter of negligible heat capacity what is the equalilbrum temperature the mixture evenually reaches?. q1+q2+q3=0 QAl = .6kg* .9kj/kg-K * ...
Monday, March 9, 2015 by sharon

Physics
How close to the edge of the 24.0 kg table shown in Figure 9-47 can a 60.0 kg person sit without tipping it over? m Table is 2.2m long each leg is 5m into the table and there is 1.2m in between each leg. The table is 8m in height.
Monday, March 9, 2015 by gabby

physics
The speedometer on an automobile measures the rotational speed of the axle and converts that to a linear speed of the car, assuming the car has 0.62-m-diameter tires. What is the rotational speed of the axle when the car is traveling at 26m/s ?
Monday, March 9, 2015 by Please Help

physics
A ballet student with her arms and a leg extended spins with an initial rotational speed of 0.90rev/s . As she draws her arms and leg in toward her body, her rotational inertia becomes 0.80 kg⋅m2 and her rotational velocity is 4.1rev/s . Determine her initial rotational ...
Monday, March 9, 2015 by Please Help

physics
Determine the change in rotational kinetic energy when the rotational velocity of the turntable of a stereo system increases from 0 to 33 rpm. Its rotational inertia is 6.8×10−3kg⋅m2 .
Monday, March 9, 2015 by Please Help

Physics
A container with a one-liter capacity at 27 degree C is filled with helium to a pressure of 2 atm. how many moles of helium does it hold?
Monday, March 9, 2015 by eddy

physics
You need to lift a 200 kg box 5 meters, but it is too heavy. You decide to push it up an incline that makes a 25 degree angle with the ground. With what force do you need to push the box?
Monday, March 9, 2015 by gal

physics
Show that the kinetic energy of two particles with mass m1 and m2 split into the energy of the centre of mass and the kinetic energy of relative motion.
Monday, March 9, 2015 by don

physics
A car covers half a distance at a velocity of 80km/h and the other half at 60km/h,what is the average velocity of the car?
Monday, March 9, 2015 by don

physics
The drive propeller of a ship starts from rest and accelerates at 2.90×10-3 rad/s2 for 2.10×103 s. For the next 1.40×103 s the propeller rotates at a constant angular speed. Then it decelerates at 2.30×10-3 rad/s2 until it slows (without reversing ...
Monday, March 9, 2015 by Jennifer

physics
The sun has a mass of 1.99 × 1030 kg and is moving in a circular orbit about the center of our galaxy, the Milky Way. The radius of the orbit is 2.3 × 104 light-years (1 light-year = 9.5 × 1015 m), and the angular speed of the sun is 1.1 × 10-15 rad/s. ...
Monday, March 9, 2015 by Jennifer

physics
A motorcycle, which has an initial linear speed of 6.6 m/s, decelerates to a speed of 2.1 m/s in 5.0 s. Each wheel has a radius of 0.65 m and is rotating in a counterclockwise (positive) direction. What are a) the constant angular acceleration (in rad/s^2) and b) the angular ...
Monday, March 9, 2015 by Jennifer

physics
a person is pulling a 100 lb box across a smooth horizontal surface. what is the acceleration of the box if they are pulling upward at an angle of 20° with a force of 75 lbs Well, I know that there is no friction involved because it is a smooth surface and that n+TsinΘ...
Monday, March 9, 2015 by Hanky

physics
A man pushing a crate of mass m = 92.0 kg at a speed of v = 0.875 m/s encounters a rough horizontal surface of length ℓ = 0.65 m as in the figure below. If the coefficient of kinetic friction between the crate and rough surface is 0.357 and he exerts a constant ...
Monday, March 9, 2015 by Ange

physics
a 0.5KG ball is drop at concrete incline which is 45 degree above the horizontal then bounces off with the speed of 5m/s due to the force applied on it what is the change in its momentum?
Monday, March 9, 2015 by musonda

physics
a 0.5KG ball is drop at concrete incline which is 45 degree above the horizontal then bounces off with the speed of 5m/s due to the force applied on it what is the change in its momentum
Monday, March 9, 2015 by musonda

Physics 1014
A large bowl contains water 10cm deep and has a small electric lamp at the bottom.A disc of cardboard is floating on the surface with its centre vertically above the lamp,and is of such diameter that the lamp can just not be seen by a person looking into the water.calculate ...
Monday, March 9, 2015 by Ntakadzeni

physics
A bullet is fired with an initial velocity 300m s at an angle 30 degree with horizontal . At what distance from the gun will the bullet strike the ground ?
Monday, March 9, 2015 by rajeev

Physics
A 54.8 g ball of copper has a net charge of 2.5 µC. What fraction of the copper's electrons have been removed? (Each copper atom has 29 protons, and copper has an atomic mass of 63.5.)
Monday, March 9, 2015 by Carlos Montoya

physics for physical science
A stone thrown vertically upwards with a speed of 12m/s from the edge of Cliff 70m high. Calculate the time the stone takes to hit the bottom of the cliff.
Monday, March 9, 2015 by Justin

physics
an object is placed 15 cm in front of a convex lens of focal length 10cm. Find the nature and position of the image formed. where should a concave mirror of radius of curvature 20cm be placed so that the final image is formed at the position of the object itself.
Monday, March 9, 2015 by meenakshi

physics
How many kilometers would you have to go above the surface of the earth for your weight to decrease to 39{\rm \\%} of what it was at the surface? Express your answer using two significant figures.
Monday, March 9, 2015 by danny

physics
A highway curve with radius 1000ft is to be banked so that a car traveling 56.0mph will not skid sideways even in the absence of friction At what angle should the curve be banked?
Monday, March 9, 2015 by danny

physics
A block (mass m) hangs from a spring (spring constant k). The block is released from rest a distance d above its equilibrium position. (a) What is the speed of the block as it passes through the equilibrium point? (Use any variable or symbol stated above along with the ...
Sunday, March 8, 2015 by Eva

physics
A war-wolf, or trebuchet, is a device used during the Middle Ages to throw rocks at castles and now sometimes used to fling pumpkins and pianos. A simple trebuchet is shown in the figure below. Model it as a stiff rod of negligible mass 3.00 m long and joining particles of ...
Sunday, March 8, 2015 by amar

physics
A boy throws a ball straight up into the air so that it leaves his hand at 11 m/s. If the ball has mass 0.15 kg and the boy's arm moved through 1.5 m as he threw the ball, then what average force did he exert on the ball?
Sunday, March 8, 2015 by Anonymous

ap physics
A student sits on a rotating stool holding two 3.8-kg objects. When his arms are extended horizontally, the objects are 1.0 m from the axis of rotation and he rotates with an angular speed of 0.75 rad/s. The moment of inertia of the student plus stool is 3.0 kg · m2 and...
Sunday, March 8, 2015 by yesica

ap physics
(a) Calculate the angular momentum of Earth that arises from its spinning motion on its axis, treating Earth as a uniform solid sphere. J · s (b) Calculate the angular momentum of Earth that arises from its orbital motion about the Sun, treating Earth as a point ...
Sunday, March 8, 2015 by yesica

physics
Each of the following objects has a radius of 0.169 m and a mass of 2.02 kg, and each rotates about an axis through its center (as in this table) with an angular speed of 38.6 rad/s. Find the magnitude of the angular momentum of each object. (a) a hoop kg · m2/s (b) a ...
Sunday, March 8, 2015 by alba

Physics - Mini Lab
The reason I didn't do this was because I was gone the day they did this at school. And the teacher said I couldn't do it at school. So I need help and my teacher is a jerk, so I have no idea what to do. Please help me. I really need a good grade in this class. Please...
Sunday, March 8, 2015 by Marisa

Physics
Continue walking at a constant speed. Just after you release the ball upward, make a sharp right turn. Where does the ball land?
Sunday, March 8, 2015 by Marisa

Physics
Continue walking at a constant speed. Just after you release the ball upward, break into a run. Where does the ball land?
Sunday, March 8, 2015 by Marisa

Physics
Continue walking at a constant speed. This time, stop instantly just after you release the ball upward. Where does the ball land?
Sunday, March 8, 2015 by Marisa

Physics
Newton's first law of motion states that an object in motion will continue to move at constant speed in a straight line. Only an outside force can change the speed or direction. If the object is at rest, it will remain at rest, unless an outside force is exerted on it. ...
Sunday, March 8, 2015 by Marisa

physics
A physics student pulls a block of mass m = 20 kg up an incline at a slow constant velocity for a distance of d = 4.5 m. The incline makes an angle Δ = 30° with the horizontal. The coefficient of kinetic friction between the block and the inclined plane is µk = ...
Sunday, March 8, 2015 by sunny

Physics
Charges of 4 µC are located at x = 0, y = 2.0 m and at x = 0, y = -2.0 m. Charges Q are located at x = 4.0 m, y = 2.0 m and at x = 4.0 m, y = -2.0 m. The electric field at x = 0, y = 0 is (4 ✕ 103 N/C) i. Determine Q.
Sunday, March 8, 2015 by srdja

Physics
A football player kicks with a speed of 21 m/s at 37 degree to the horizontal. How long is the ball in the air?
Sunday, March 8, 2015 by Cullen

physics
if a monochromatic beam of light with a wavelength of 590 nanometers is traveling through air then enters a region of space where the index of refraction is 1.5, what will the light beam do? increase, decrease, or stay the same?
Sunday, March 8, 2015 by sue

Physics
A 24.5-kg child is standing on the outer edge of a merry-go-round which has moment of inertia 989 kg • m2 and radius 2.40 m. The entire system is initially rotating at 0.180 rev/s. Find the angular velocity if the child moves to a final position 1.10 m from the center of ...
Sunday, March 8, 2015 by Anonymous

physics
calculate how far along the ground would the bicycle move if one of the wheels had an angular displacement magnitude of 500rev
Sunday, March 8, 2015 by Sarah

physics
If a bicycle moves 20m what is the angular displacement in degrees, revolution and radians?
Sunday, March 8, 2015 by solomon

mathematics,physics,life science,LO,afrikaans
A number of circles are given and the area of the smallest circles is 4π.The area of the next circle is 9/4 times of the previous circle.if there are 6 circles,determine the length of the diameter of the last circle.
Sunday, March 8, 2015 by uchriciah

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