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Homework Help: Science: Physics

Recent Homework Questions About Physics

Physics
Your daredevil friends attach a rope to a 140kg sled that rests on a frictionless icy surface. The rope extends horizontaly to a smooth dead tree trunk lying at the edge of a cliff. Another person attaches a 30kg rock at the end of the rope after it passes over the tree trunk ...
Sunday, October 23, 2016 by Hang

physics
A 64.8 g drink is left on a turntable causing it to turn with an angular speed of 8.50 rad/s. If the drink has coefficients of friction of μs = 0.890 and μk = 0.500 with the turntable, what is the furthest distance that the drink could have been placed from the ...
Sunday, October 23, 2016 by kate

physics
A race car track has been constructed with the a bank angle of 32.7° so there is no friction force. The race car track has a curve radius of 394 m. What speeds, for the race cars, has the track been designed to accommodate?
Sunday, October 23, 2016 by marina

Physics
The mass of a spacecraft is about 480 kg. An engine designed to increase the speed of the spacecraft while in outer space provides 0.09 N thrust at maximum power. By how much does the engine cause the craft's speed to change in 1 week of running at maximum power? Describe any ...
Sunday, October 23, 2016 by Anna

Physics
An object of mass m1 is placed on an inclined plane (angle theta above the horizontal) is connected by a string going over a pulley to a hanging object of mass m2. Determine the acceleration of the system if there is no friction between object 1 and the surface of the inclined...
Sunday, October 23, 2016 by Anna

Physics
You push a 1kg block against a spring with spring constant k = 100 Nmon a horizontal table top. The spring is compressed to 0.2m away from its relaxed length, and then the block is released. If the horizontal table top has a coefficient of kinetic friction of 0.2, how much ...
Sunday, October 23, 2016 by Kevin

Physics
Ball 1 initially travels with a velocity of u m/s.Ball 2 is stationery and has a mass of 0.2kg and this collision lasts for 0.1 s.Afterwards both balls move in the direction of ball 1's initial velocity. Each ball has a different final velocity. During the collision a force of...
Sunday, October 23, 2016 by Wasim

Physics
A 0.630 kg wooden block is spun around on a wooden table. The wooden block is being spun around on a 2.00 m long massless wire. The wooden block has air being pushed out behind it causing a thrust force of 3.30 N. The air is being pushed out at 70.0° from the radial line as ...
Sunday, October 23, 2016 by Fred

Physics
You toss a tennis ball straight upward. At the moment it leaves your hand it is at a height of 1.3 m above the ground, and it is moving at a speed of 7.4 m/s. (a) How much time does it take for the tennis ball to reach its maximum height? (b) What is the maximum height above ...
Sunday, October 23, 2016 by Mary

Physics
Particle A makes a perfectly elastic collision with another particle B at rest they fly apart in opposite direction with equal speeds the ratio of their masses mA/mB is?
Sunday, October 23, 2016 by Mritunjay Pandey

Physics
Weight of an object on the surface is 100N . What will we it's weight a planet whose mass 10times that of earth and radius is 3 times as that of earth??
Sunday, October 23, 2016 by Rani solanki

Physics
A 350-kg disk-shaped non-rotating satellite gets hit by a 5-g piece of space debris moving at 1.5 km/s. If the debris buries itself near the satellite’s rim, how rapidly will the satellite rotate after the hit?
Sunday, October 23, 2016 by Josh

Physics
A football quarterback shows off his skill by throwing a pass 45.90 m downfield and into a bucket. The quarterback consistently launches the ball at 40.00 ∘ above horizontal, and the bucket is placed at the same level from which the ball is thrown. What initial speed is ...
Saturday, October 22, 2016 by Lily

physics
Calculate the mass of moon if free fall acceleration near it surface is know be 1.62 m/s^2 ( radius of moon is 1738 Km )
Saturday, October 22, 2016 by Anonymous

Physics
If vector A×vector B=0,does it necessary follow that A=0 or B=0? Explain.
Saturday, October 22, 2016 by Amrit

physics
If a 5kg object experiences a 10 N force for a duration of 0.10 second then what is the momentum change of the object.
Saturday, October 22, 2016 by Manilyn

physics
The water tank is 8 m above the tap. What pressure forces the water out from the tap?
Saturday, October 22, 2016 by Manilyn

physics
The pressure of water on the ground floor is 40,000 Pascal, and at the first floor is 10,000 pascal. Find the height of the first floor.
Saturday, October 22, 2016 by Manilyn

physics
If the systolic blood pressure is 120mmHg, what is the pressure in lb/in^2 and in pascals?
Saturday, October 22, 2016 by Manilyn

physics
What is the pressure of the water in pascals at the bottom og a lake which is 5 meters deep?
Saturday, October 22, 2016 by Manilyn

physics
The center of a 1.00km diameter spherical pocket of oil is 1.00kkm beneath the Earth's surface. Estimate by what percentage g directly above the pocket of oil would differ from the expected value of for a uniform Earth? Assume the density of oil is 8.0*10^2kg/m^3. Δg/g = ? %
Saturday, October 22, 2016 by katie bornia

physics
Question 6) Oil and gas exploration companies find new underground deposits by measuring (with incredible precision) the value of g at the Earth's surface. EXTRA INFO GIVEN: The challenge: F=Gm1m2/r^2 ONLY works for two cases: point masses, or if one of the masses has ...
Saturday, October 22, 2016 by katie bornia

Physics
An astronaut with mass M floating at rest in the International Space Station catches a spinning frisbee that someone has thrown directly towards his or her center of mass. The frisbee has a mass m, a radius r, a moment of inertia of ⅔ mr2, and had a speed vo and was ...
Saturday, October 22, 2016 by Juan L

physics numerical
A 15 g bullet is fired from a gun of mass 2kg with a speed of look m/s . Find the recoil velocity of the gun.
Saturday, October 22, 2016 by Anonymous

Repost(Physics)
A vehicle moves in a straight line with an acceleration of 2 km/h^2. By how much does the speed change each second? Answer in units of km/h. Plz help?
Saturday, October 22, 2016 by Jazz

Physics
A vehicle moves in a straight line with an acceleration of 2 km/h^2. By how much does the speed change each second? Answer in units of km/h. Plz help?
Saturday, October 22, 2016 by Jazz

Physics
A 1.11 kg toy train rolls around a circular horizontal track. If the train has an angular acceleration of -2.2 rads/s2 and is released with an angular speed of 17.0 rpm, what time is required for the train to come to a complete stop?
Saturday, October 22, 2016 by Tom

Physics
A 51.6 g box is left 17.8 cm from the centre of a merry-go-round. If the box has coefficients of friction of μs = 0.790 and μk = 0.480 with the merry-go-round, what is the maximum speed of the merry-go-round without having the box slide off of the merry-go-round?
Saturday, October 22, 2016 by Tom

Math Physics Torque Equilibrium
A uniform meterstick pivoted at its center has a 100 g mass suspended at the 21.0 cm position. At what position should a 95.0 g mass be suspended to put the system in equilibrium? What mass would have to be suspended at the 80.0 cm position for the system to be in equilibrium?
Saturday, October 22, 2016 by Brandon

Physics
in the laboratory frame, a photon of energy 8.0 x 10^3 eV and a free electron of energy 2.0 x 10^3 eV (consider what is meant by 'energy' here; is it kinetic energy? total energy? can it be total energy?) are moving directly towards each other and collide head on. a) in the ...
Saturday, October 22, 2016 by deniz

Physics
Is it possible that resultant of two vectors e smaller than the smaller of the two vectors?
Saturday, October 22, 2016 by Sonika

Physics
A 500-kg disk-shaped nonrotating satellite gets hit by a 5-g piece of space debris moving at 1 km/s. If the debris buries itself near the satellite’s rim, how rapidly will the satellite rotate after the hit?
Saturday, October 22, 2016 by Megan

Physics
I've been stuck on this questions for 2 days A 7.2-kg bowling ball traveling at a speed of 3.5 m/s collides with a 1.2-kg bowling pin at rest. After the collision, the pin moves with a speed of 3.0 m/s at an angle of 60° with respect to the original direction of motion of the...
Saturday, October 22, 2016 by Lana

physics
I have put a 100 gram weight ball in a plastic bottle and weight of this bottle is 20 gram .Now I shake this bottle in horizontal direction towards 5 centimeter back and forth with the applying force of 1 newton .So what will be the kinetic energy of this ball?
Saturday, October 22, 2016 by vikram

Physics
Can you find a vector quantity that has a magnitude of zero but components that are different from zero? Explain.
Saturday, October 22, 2016 by Amrit

Physics
Can you find two vectors with different lengths that have a vector sum of zero? What length restrictions are required for three vectors to have a vector sum zero? Explain.
Saturday, October 22, 2016 by Amrit

Physics
Can you find two vectors with different lengths that have a vector sum of zero? What length restrictions are required for three vectors to have a vector sum zero? Explain.
Friday, October 21, 2016 by Amrit

Physics
Two vectors A and B have magnitude A=3 and B=3,their vector product is A×B=2i-5k what is the angle between vector A and B?
Friday, October 21, 2016 by Amrit

Physics
Two bodies with equal momentum have KE in the ratio 5:4. What will be the ratio of their masses be?
Friday, October 21, 2016 by Prism

Physics
What is the order of drift velocity of electron during the flow of current through the metal?
Friday, October 21, 2016 by Prism

PHYSICS: PLEASE HELP A.S.A.P HMK DUE AT MIDNIGHT T
During a storm, a car traveling on a level horizontal road comes upon a bridge that has washed out. The driver must get to the other side, so he decides to try leaping the river with his car. The side of the road the car is on is 21.9 m above the river, while the opposite side...
Friday, October 21, 2016 by MYA

Physics
A neutron with mass 1.67e-27 kg moving with speed 5.0 × 101 km/s makes a head-on collision with a boron nucleus, originally at rest, with mass 1.66e-26 kg. A) If the collision is completely inelastic, so the particles stick together, what is the final kinetic energy of the ...
Friday, October 21, 2016 by Anonymous

Physics
A student has a small battery-powered alarm buzzer. The student throws the buzzer toward a stationary wall (possibly due to frustration following a physics midterm examination). The buzzer emits sound with a frequency of 74 Hz, and the wall reflects the sound. If the buzzer is...
Friday, October 21, 2016 by Po

physics
A rookie quarterback throws a football with an initial upward velocity component of 15.9 m/s and a horizontal velocity component of 18.0 m/s . Ignore air resistance. a) How much time is required for the football to reach the highest point of the trajectory? c) How much time (...
Friday, October 21, 2016 by Kiran

physics qui
The radius of the Earth is 6.37×1000000 m and its average dencity is 5.517×1000kg/m×m×m.calculate​ the mass of earth to correct significant figures.
Friday, October 21, 2016 by Anonymous

physics
The characteristics of a horizontal and undamped spring-block system are k=400N/m and M=0.3kg.The position of the block is determined by its abscissa along an x'ox axis. When the spring has its natural length then x=0. a) the spring is stretched by shifting the block by 10 cm ...
Friday, October 21, 2016 by vicky

physics
what is the minimum effort required to raise a load of 5kg in an ideal pulley system taking gravity to be 10m/s/s
Friday, October 21, 2016 by francis

physics
A car travels 20 km southwards and then another 30 westwards. What is the displacement of the car from its initial position?
Friday, October 21, 2016 by Victor

Maths
In a class 30 students pass in maths, 20 pass in physics and 8 pass in both. Find the number of students failed in both if the total students are 45.
Friday, October 21, 2016 by Swapnamayee sahoo

Physics
A ball hanging from a twisted string is released from rest, and spins around in a circle (reversing direction periodically). The angular velocity of the ball is given by: 𝜔(𝑡)=(16 𝑟𝑎𝑑/𝑠) sin[(𝜋/5 𝑟𝑎&#...
Friday, October 21, 2016 by A

Physics
As part of a daring rescue attempt, the Millennium Eagle coasts between a pair of twin asteroids, as shown in the figure below where d1 = 2.55 km and d2 = 1.28 km. The mass of the spaceship is 2.53 x10^7 kg and the mass of each asteroid is 3.70x10^11 kg. Find the speed of the ...
Friday, October 21, 2016 by A

Physics
A 1200 -kg car is pushing an out-of-gear 2100 -kg truck that has a dead battery. When the driver steps on the accelerator, the drive wheels of the car push horizontally against the ground with a force of 4500 N . The rolling friction of the car can be neglected, but the ...
Friday, October 21, 2016 by Amily

physics
When a water gun is fired while being held horizontally at a height of 1.00 m above ground level, the water travels a horizontal distance of 5.30 m. A child, who is holding the same gun in a horizontal position, is also sliding down a 45° incline at a constant speed of 2.44 m...
Friday, October 21, 2016 by sofia

physics
a 10-g fridge magnet is holding a 2.0 piece of paper on the stainless steel fridge door. A normal force of 0.19 N( the horizontal force of the fridge pushing against the attractive, horizontal, magnet accelerated down the fridge with a net acceleration of 0.150 m/s2 when the ...
Thursday, October 20, 2016 by kinsey

Physics
An 8kg ball traveling to the east at 10m per sec collides, with a 2kg ball traveling to the west with a velocity of 5 meters per sec. After the collision they move together.Determine the final velocity of the balls. Assume that there are no resistive forces.
Thursday, October 20, 2016 by Jae

Physics
A stone is tied to a string (length = 0.600 m) and whirled in a circle at the same constant speed in two different ways. First, the circle is horizontal and the string is nearly parallel to the ground. Next, the circle is vertical. In the vertical case the maximum tension in ...
Thursday, October 20, 2016 by Sam

Physics
At what speed would a 50kg person have to run to have the same kinetic energy as a 1000kg auto traveling at 100 km/h? Help ASAP please!! Show work step by step along with the equation
Thursday, October 20, 2016 by Anonymous

Physics
Use the Work-Energy Theorem to show that an object with initial velocity vo will travel a distance d across a rough horizontal surface before stopping, where d = vo2/(2mKg). Help ASAP please!!
Thursday, October 20, 2016 by Anonymous

Physics
Starting from rest, a 5kg block slides 2.5 m down a rough 30o incline in 2 seconds. Find a) the work done by the force of gravity. b) the work done by friction. c) the work done by the normal force Help ASAP please!! Show work step by step only with the equation
Thursday, October 20, 2016 by Anonymous

Physics
On vacation, your 1350 kg car pulls a 540 kg trailer away from a stop light with an acceleration of 2.20 m/s2. (a) What is the net force exerted by the car on the trailer? (b) What force does the trailer exert on the car? (c) What is the net force acting on the car?
Thursday, October 20, 2016 by Timmy

physics
a football is kicked with an initial speed of 80 m/s at an angle of 30 degrees above the horizontal. A. what is the maximum height that the ball attains? b. what is the balls hang time? (how long is it in the air) c. what is the range of the ball? (how far did it go)
Thursday, October 20, 2016 by Ely

physics need asap help
Two masses m amd 2m approach each other along a part right angles to eachother. After collision, they stick together and move off at 2m/s at an angle 37¤ to the original direction of m....what is the initial speeds of the particles???
Thursday, October 20, 2016 by Muse

physics need help
An object , constrained to move along the x-axis is acted upon by a force F(x)=ax + bx^2 where a=5N/m , b=-2m/s The object is observed directly from x=1m to x=3.0 m... How much work is done by the force?
Thursday, October 20, 2016 by Anonymous

physics
Calculate the velocity time graph of a body at rest is given an initial uniform acceleration .
Thursday, October 20, 2016 by 7up

physics
Calculate the velocity time graph of a body at rest is given an initial uniform acceleration.
Thursday, October 20, 2016 by 7up

physics
An adult dolphin weighs around 1560 N. How fast must he be moving as he leaves the water vertically in order to jump to a hei ght of 3.50 m? Ignore air resistance.
Thursday, October 20, 2016 by Cuti

Physics algebra and trig
A pair of fuzzy dice is hanging from the rearview mirror of a race car. As the car accelerates smoothly, the strings of the dice are tilted slightly toward the rear of the car. From the perspective of the driver, which one of the following statements is true, if the dice are ...
Thursday, October 20, 2016 by Kyle

Physics
Two identical boxcars (m = 14866 kg) are traveling along the same track but in opposite directions. Both boxcars have a speed of 5 m/s. If the cars collide and couple together, what will be the final speed of the pair?
Thursday, October 20, 2016 by Cindy

Physics
A 0.15 kg baseball is moving at 35 m/s toward home plate when it is hit with the bat. The ball is in contact with the bat for 0.0019 s, and leaves the bat at 25 m/s directly away from home plate. Determine the average force exerted by the bat on the ball.
Thursday, October 20, 2016 by Timmy

physics
a 700g solid cube having an edge of length 10cm floats in water how much volume of the cube is outside the water?
Thursday, October 20, 2016 by Jahnavi

Physics
Ok, I have few questions which I solved but the answers in he book do not match with the ones that I got. Q1. The de-Brogile wavelength of a neutron at 927 degree C is {lambda}. What will be its wavelength at 27 degree C? I got 2 {lambda}, book says {lambda}/2 Q2. The distance...
Thursday, October 20, 2016 by new user

Physics
Movers are looking to lower a cabinet out of an open window to a mattress on the ground below. One end of a rope is tied to a 188 kg dresser, looped through a pulley, and the other end of the rope is tied to a cabinet. If the coefficient of kinetic friction between the dresser...
Thursday, October 20, 2016 by Grace

PHYSICS- PROJECTILE MOTION
Crickets Chirpy and Milada jump from the top of a vertical cliff. Chirpy just drops and reaches the ground in 3.10 s , while Milada jumps horizontally with an initial speed of 89.0 cm/s. How far from the base of the cliff will Milada hit the ground? Ignore air resistance.
Thursday, October 20, 2016 by SAM

PHYSICS- PROJECTILE MOTION
A physics book slides off a horizontal table top with a speed of 1.90 m/s. It strikes the floor after a time of 0.410 s. Ignore air resistance. a) Find the magnitude of the horizontal component of the book's velocity just before the book reaches the floor. b) Find the ...
Thursday, October 20, 2016 by SAM

Physics
At room temperature of 30 degree celsius, a glass of water takes one minute to cool from 80 degree celsius to 60 degree Celsius. How long will it take to further cool from 60 degree celsius to 50 degree celsius?
Thursday, October 20, 2016 by new user

Physics
An object of mass 12kg is pushed 34m up a frictionless slope that is at an angle of 56^o to the horizon. Determine both (a) the work on the object and (b) its change on gravitational potential energy.
Thursday, October 20, 2016 by Saphina AlMatary

Physics
A vehicle of mass 600kg, moving at a speed of 30ms^-1 collides with a stationary vehicle of mass 900kg. The two vehicles lock together on impact. Calculate: 1) The speed of the two vehicles immediately after the impact. 2) The force of the impact, if the duration of the ...
Thursday, October 20, 2016 by Saphina AlMatary

Physics
A ball of mass 1.5kg is struck by a bat in the opposite direction to the motion of the ball. Before the impulse the ball is travelling at 16ms^-1 and the impulse of the bat on the ball is 50 Ns. Find the velocity of the ball immediately after the impact.
Thursday, October 20, 2016 by Saphina AlMatary

Physics
A ball of mass 2kg travelling in a straight line at 4ms^-1 is acted on by a force of 3N acting in the direction of motion for 5 seconds. What is the speed of the ball after 5 seconds?
Thursday, October 20, 2016 by Saphina AlMatary

physics
a 1000 kg truck traveling at a speed of 40m/s skids to a halt on wet concrete where µk = 0.60. how long are the skid marks? (Please explain all variables and equations I'm clueless in this subject) I keep trying to use the equation I found online: d= v^2/2ug but I do not ...
Thursday, October 20, 2016 by joe

physics
Anne flies due east from san Francisco to Washington dc a displacement of 5600 km. She then flies from Washington to Boston a displacement of 900 km at an angle of 55 degrees east of north. What is Anne's total displacement?
Wednesday, October 19, 2016 by wes

physics
How many joules of energy are required to heat 2 L of water from 25 C to 100 C? I looked up that the specific heat is 4200 J/kgK and i keep getting Q to equal 630000 but my homework website says that's wrong.
Wednesday, October 19, 2016 by Sarah

physics
van can swim 3.0 m/s in still water. while trying to swim directly across a river from west to east, van is pulled by a current flowing southward at 2.0 m/s. what is the magnitude of van's resultant velocity?
Wednesday, October 19, 2016 by wes

Physics
Starting from rest, a 5kg block slides 2.5 m down a rough 30o incline in 2 seconds. Find a) the work done by the force of gravity. b) the work done by friction. c) the work done by the normal force Do part b last
Wednesday, October 19, 2016 by Anonymous

Physics
Use the Work-Energy Theorem to show that an object with initial velocity vo will travel a distance d across a rough horizontal surface before stopping, where d = vo2/(2mKg).
Wednesday, October 19, 2016 by Anonymous

Physics
At what speed would a 50kg person have to run to have the same kinetic energy as a 1000kg auto traveling at 100 km/h?
Wednesday, October 19, 2016 by Anonymous

Physics
In the figure, a 6-kg box is sliding up an incline that makes an angle of theta=30 degree (with respect to the horizontal). As it slides up the incline, a kinetic frictional force fk acts on it. The acceleration of the block has magnitude 8 m/s2. Let the x+ direction point up ...
Wednesday, October 19, 2016 by Alexis

physics
Two identical boxcars (m = 14866 kg) are traveling along the same track but in opposite directions. Both boxcars have a speed of 5 m/s. If the cars collide and couple together, what will be the final speed of the pair?
Wednesday, October 19, 2016 by Sue

physics
Assume: A 78 g basketball is launched at an angle of 54.5 ◦ and a distance of 10.4 m from the basketball goal. The ball is released at the same height (ten feet) as the basketball goal’s height. A basketball player tries to make a long jump-shot as described above. The...
Wednesday, October 19, 2016 by Julia

physics
a 280. kg crate, to the right of the pulley, is released from rest and begins to fall to the ground. If the mass on the left is m=160. m=160. kg, what is the magnitude of the tension of the rope attached to the 280. kg crate? Assume the rope and pulley are massless.
Wednesday, October 19, 2016 by Marina

physics
A group of construction workers are building a house and want to lower down an excess bundle of 2390 kg bricks to ground. They tie one end of a rope to the bundle of bricks, loop it through a pulley, and tie the other end of the rope to a toolbox. If the coefficient of ...
Wednesday, October 19, 2016 by Marina

physics
A row of blocks are lined up with masses of 1.10 kg, 2.72 kg and 4.05 kg. The masses are then pushed forward by a 14.3 N force applied to the 1.10 kg block. If the table is frictionless, how much force does the 2.72 kg block exert on the 4.05 kg block?
Wednesday, October 19, 2016 by Marina

physics
A block of mass 0.49kg starts from rest at point A and slides down a frictionless hill of height h. At the bottom of the hill it slides across a horizontal piece of track where the coefficient of kinetic friction is 0.28. This section (from points B to C) is 3.60m in length. ...
Wednesday, October 19, 2016 by taylor

physics
A body is thrown verticarry upwards with an initial velocity of 12m/s.(taking G to be 10m/s^2) a)how far does it go during this first second? b)find the maximum height it reaches. c)how long does it remain in the air?
Wednesday, October 19, 2016 by sibonisile jere

physics
if r1=2ohms, r2=4ohms, r3=6ohms. Then what is the voltmer reading connected in series
Wednesday, October 19, 2016 by vikky

Physics
a twin engine plane flies due south with an air speed of 335km/h. There is a wind blowing at 75km/h to the east relatve to the ground. what are the plane's speed and direction relative to the ground
Wednesday, October 19, 2016 by Daniel

Physics
When boiling​ water, a hot plate takes an average of 9 minutes and 47 seconds to boil 100 milliliters of water. Assume the temperature in the lab is 75 degrees Fahrenheit. The hot plate is rated to provide 195 watts. How efficient is the hot​ plate? Thanks.
Wednesday, October 19, 2016 by Bobby

physics
a ball thrown vertically upward from the ground,hit the ground after 4seconds,calculate the maximum height reach by the ball during the jorney
Wednesday, October 19, 2016 by cardinal

physics
Two railroad cars, each of mass 1800 kg and traveling 70.0 km/hr, collide head-on and come to rest. How much thermal energy in joules is produced in this collision?
Tuesday, October 18, 2016 by kassy

physics
An object slides down a frictionless 33 degree incline whose vertical height is 37.0 cm. How fast is it going in meters/second when it reaches the bottom?
Tuesday, October 18, 2016 by kassy

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