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March 2, 2015

Homework Help: Science: Physics

Recent Homework Questions About Physics

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physics
a ball rolls off the table top 2m tall. with a velocity of 10m/s. with what speed will it strike the ground? A. 10m/s B. 6.3m/s C. 16.3m/s D. 11.8m/s E. 139m/s
Sunday, January 4, 2015 at 12:35am

physics
An acceptable unit for power would be A. kg-m/s B. kg-m-m/s/s/s C. N/s D. Kg-m-m/s/s E. J-s
Sunday, January 4, 2015 at 12:32am

physics
a wooden block of mass equal to 15kg is pressed against a spring. The spring has constant of 225N/m. If the spring is compressed 0.15m, how fast will the block travel when released?
Sunday, January 4, 2015 at 12:15am

physics
a toy car rolls horizontally on to a ramp that has a total height of 0.8m. what minimum velocity will allow the car to reach the top of the ramp/
Saturday, January 3, 2015 at 8:05pm

Physics, Math, Aerospace, Engineering
A de-orbit burn, similar (but not the same) to that presented in the previous math problem, has been performed. During this de-orbit burn a pre-calculated ∆V (delta V, change in velocity) of 99.1 meters per second will be used to decrease the Shuttle’s altitude from...
Saturday, January 3, 2015 at 7:22pm

physics
A 0.5 kg rock is projected from the edge of the top of a building with an initial velocity of 9.66 m/s at an angle of 41 degrees. The building is 10.1 m in height. At what horizontal distance, x, from the base of the building will the rock strike the ground? Assume the ground ...
Saturday, January 3, 2015 at 4:49pm

Physics
How much force is required to accelerate a 1500kg car to a speed of 17m/s in a distance of 45m? Thank you.
Saturday, January 3, 2015 at 7:28am

Physics
A mass of 25kg is acted on by a force of 56N. If a friction force of 12N exists, find the acceleration of the mass. I have worked the following: a=F/M = 44/25 = 1.76 m/s2 Am I correct? Thank you.
Saturday, January 3, 2015 at 7:14am

physics
Three vectors are specified as A is 5 m at 45o north of east, B is 7 m at 60o east of south, and C is 4 m at 30o west to south. Find the magnitude and direction of their sum.
Saturday, January 3, 2015 at 6:11am

physics
A man walks 5 m at 37 degree north of east then 10 m at 60 degree west of north.? calculate the magnitude and direction of his displacement.
Saturday, January 3, 2015 at 6:10am

physics
a car is traveling 25 ns^-1 around a level curve of radius 120 m. what is the minimum value of the coefficient of static friction µs between the tires and the road to prevent the car from skidding
Saturday, January 3, 2015 at 5:44am

physics
An object is thrown up from the top of building 50 m high. it rises to a maximum height of 20 m above the roof.? a) when does it land on the ground b) at what velocity does it land? c) what is its velocity 15m below the roof?
Saturday, January 3, 2015 at 4:43am

physics
Determine the x and y components of the following vectors? a) P of length 5 m directed at 150 degree counter clockwise from the positive x axis b) Q of length 3.6 m directed at 120 degree clockwise from the positive y axis
Saturday, January 3, 2015 at 4:22am

physics
a ship sails from a point at a distance of 4 km and a bearing of 40 degree noth of east relative to a lighthouse to a point 6 km from the lighthouse at 60 degree north to west. calculate a) the displacement b)the least distance between them
Saturday, January 3, 2015 at 4:13am

physics
Three vectors are specified as A is 5 m at 45o north of east, B is 7 m at 60o east of south, and C is 4 m at 30o west to south.?Find the magnitude and direction of their sum.
Saturday, January 3, 2015 at 4:11am

physics
A man walks 5 m at 37 degree north of east then 10 m at 60 degree west of north.? calculate the magnitude and direction of his displacement.
Saturday, January 3, 2015 at 4:01am

Physics
You are going diving in a pool of fresh water. Your body can only take a total pressure on it of 2.0 atmospheres. How deep can you dive before your body can no longer take the pressure?
Friday, January 2, 2015 at 8:31pm

physics
A toy boat has a volume of 0.0005m^3. It has a mass of 450 grams. How much of the boat is under fresh water?
Friday, January 2, 2015 at 6:44pm

Physics
A hot air balloon of radius 12 meters has been heated so that the air inside has a density of 1.05 kg/m^3. What can the total load of the balloon be (mass of balloon itself plus cargo) if you need the balloon to accelerate into the air with an acceleration of 4 m/s^2?
Friday, January 2, 2015 at 6:16pm

Physics
A place kicker must kick a football from a point 33.0 m (about 36 yd) from the goal. As a result of the kick, the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 20.0 m/s at an angle of 48◦ to the horizontal. To...
Friday, January 2, 2015 at 3:51pm

physics
Explain why a minibus is more likely to topple over when the roof rack is heavily loaded than when the roof rack is empty.
Friday, January 2, 2015 at 3:36pm

physics
A ball is thrown horizontally from the top of a building 43.4 m high. The ball strikes the ground at a point 57.3 m from the base of the building. The acceleration of gravity is 9.8 m/s^2. a. Find the time the ball is in motion. Answer in units of s. b. Find the initial ...
Friday, January 2, 2015 at 2:09pm

physics
An insect walks 50 cm in a straight line along a wall. if its horizontal displacement is 25 cm,? calculate its vertical displacement.
Friday, January 2, 2015 at 11:15am

physics
a baseball is thrown at 30ms^-1. the batter hits it and gives it a velcoity of 40ms^-1 in the opposite direction. if the ball and bat are in contact for 0.04 s, what is the average acceleration of the ball during this interval?
Friday, January 2, 2015 at 10:46am

Physics 1
a piece of stone was dropped from the top of the building. the stone took 10 s to hit the ground. what is the veocity of the stone just before it hit the ground?
Thursday, January 1, 2015 at 11:11pm

Physics
A force of 270N acts on a mass of 13.5kg for 13sec. Calculate a) the acceleration b) the final velocity c) the distance covered. a)F=m*a, so 270=13.5*a/13, answer 260m/s b)Not sure which formula. c)Formula d=v*t, once velocity is worked out in question b). I am not sure with a...
Thursday, January 1, 2015 at 10:21pm

physics
A golfer takes two putts to get his ball into the hole once he is on the green. The first putt displaces the ball 3.4 m east, and the second 6.55 m south. What displacement would have been needed to get the ball into the hole on the first putt. answer in units of m
Thursday, January 1, 2015 at 8:26pm

Physics
A 6kg mass is acted on by a force for 60sec and acquires a speed of 10m/s. What is the value of the force? I have calculated this as below: F = ma Therefore F = 6*10/60 F=1N Am I on the correct path? Thank you kindly
Thursday, January 1, 2015 at 5:28pm

Physics
A block and tackle with a velocity ratio of 5 is used to raise a mass of 25kg through a vertical distances of 40cm at a steady rate.if the effort is equal to 60N,determine.(a)The distance moved by the effort.(b)The workdone by the effort in lifting the load.(c)The loss in ...
Thursday, January 1, 2015 at 10:54am

Physics
What force is required to give a 1kg body a velocity of 5m/s after acting for 5sec? I know I can use F=mxa What do I do with the 5sec? Thanks
Thursday, January 1, 2015 at 7:33am

physics
A stone is thrown into water pond forming 10 waves in 5 seconds. The diameter of the first crest is 13 m and the diameter of the last crest is 4m. Find a.the periodic time b.the frequency c.the wave length d.the wave velocity
Thursday, January 1, 2015 at 5:58am

physics
A ball strikes against the floor and returns with double velocity.In which type of collision is it possible?
Thursday, January 1, 2015 at 3:24am

physics
A car moves at a constant speed of 60 km/hr for 1 km and 40 km/hr for next 1 km. What is the average speed of the car ?
Thursday, January 1, 2015 at 3:09am

physics
to view full image of an object 160 cm high, the minimum size of the plane mirror required is?
Wednesday, December 31, 2014 at 7:34pm

Physics
1) On the construction site an electric crane is used to lift materials to the 10th floor. A 180 kW motor requires 2.0 minutes to lift a 10500 kg load if bricks 218 m. How efficient is the crane? 2. Burning 1.0 kg of coal releases 33 MJ of energy. This energy is converted into...
Wednesday, December 31, 2014 at 4:08pm

physics
10. A 2-kg object is moving at 3m/s. A 4-N force is applied in the direction of motion and then removed after the object has traveled an additional 5m. The work done by this force is: A. 12 J B. 15 J C. 18 J D. 20 J E. 38 J ans: D 11. A sledge (including load) weighs 5000 N. ...
Wednesday, December 31, 2014 at 2:09pm

Physics
Starting from Newton’s law of universal gravitation, show how to find the speed of the moon in its orbit from the earth-moon distance of 3.9 × 108 m and the earth’s mass. Assume the orbit is a circle. So I calculated this and got 1.0 km/s, I was just wondering ...
Wednesday, December 31, 2014 at 1:49pm

Physics
What is the orbital velocity of the Earth around the Sun, assuming the Earth takes a perfectly circular orbit around the Sun? What would be the centripetal acceleration of the Earth around the Sun? (I have no clue :() From my textbook I found out that Earth has a mass of 5....
Wednesday, December 31, 2014 at 1:09pm

physics
a battery has an e.m.f of 6 volts and an internal resistance of 0.4 ohm.it is connected to a 2.6 ohm resistor through a SPST{single pole,single throw}switch.when the switch is closed,the potential difference between the terminals of the battery is,involts?
Wednesday, December 31, 2014 at 7:15am

physics
two forces of the same magnitude act at a point.the square of their resultant is 3 times the product of their magnitudes.the angle between them is?
Wednesday, December 31, 2014 at 7:10am

physics
2.4 ampere current is flowing in a wire .how many electrons pass a given point in the wire in one second if the charge on an electron is 1.6x10 power -19 couloms.
Wednesday, December 31, 2014 at 7:07am

physics
a toroid has 3000 turns. the inner and outer diameter are 22 cm and 26 cm. what is the flux density inside the core when there is a current of 5 amperes?
Wednesday, December 31, 2014 at 7:02am

physics
the resistance of a platinum resistance thermometer is 200.0 ohm at o degree centigrade and 257.6 ohm when immersed in hot bath,what is the temperature of the bath when 'alpha' for platinum is 0.00392degree centigrade inverse.
Wednesday, December 31, 2014 at 6:57am

physics
A locomotive is running at a constant speed of 100 km/ h. The diameter of driving wheels is 1.8 m. The stroke of the piston of the steam engine cylinder of the locomotive is 600 mm. Find the centripetal acceleration of the crank pin relative to the engine frame.
Wednesday, December 31, 2014 at 5:52am

physics
A flywheel is making 180 r.p.m. and after 20 seconds it is running at 140 r.p.m. How many revolutions will it make, and what time will elapse before it stops, if the retardation is uniform ?
Wednesday, December 31, 2014 at 5:48am

physics
what will be the centipetal acceleration on a man whose mass is 80 kg,when resting on a ground at the equator if the radius of the earth'R' is 6.4x10 power 6 meter.
Wednesday, December 31, 2014 at 5:39am

physics
the speed of an object at the end of 4 successive seconds is 20,25,30 and 35 meters per second,respectively.the acceleration of this object is?
Wednesday, December 31, 2014 at 5:35am

physics
a ball of weight 200 grams,is tied to the end of a cord and whirled in a horizontal circle of radius 0.6 m.if the ball makes five complete revolutions in 2 seconds,what will be the linear speed of the ball?
Wednesday, December 31, 2014 at 5:32am

physics
A cage descends a mine shaft with an acceleration of 0.5 m/s2. After the cage has travelled 25 metres, a stone is dropped from the top of the shaft. Determine : 1. the time taken by the stone to hit the cage, and 2. distance travelled by the cage before impact.
Wednesday, December 31, 2014 at 5:30am

physics
What is the mass if an elephant that has 45,000 J when it is moving 5.0 m/s
Tuesday, December 30, 2014 at 8:28pm

Physics
Initially sliding with a speed of 2.5 m/s, a 2.0 kg block collides with a spring and compresses it 0.35 m before coming to rest. What is the force constant of the spring?
Tuesday, December 30, 2014 at 1:41pm

physics
How much thrust is required to launch a 5 kg bottle rocket with an upward acceleration of 6.4 m/s2? I've gotten 32 because F=MA but I don't understand how to account for gravity. Please help!
Tuesday, December 30, 2014 at 1:30pm

physics
a rock is dropped from a high brige.at the end of 3 seconds of free fall the speed of the rock is:[in centimeters per second,g=10 m/second square]
Tuesday, December 30, 2014 at 11:01am

physics
Given that an iron ball falls in glycerine contained in a jar where the viscous force F depends on terminal velocity V radius R of the ball and the coefficient of viscosity obtain and name the mathematical expression suitable for the relationship btw the parameter if the ...
Tuesday, December 30, 2014 at 10:55am

physics
Two carts are in contact on a horizontal frictionless surface. Cart 'A' has a mass of 3 kg, and cart 'B' a mass of 2 kg. (a) Find the force F on 'A' needed to give the two carts an acceleration of 0.8 m/sec2 . What is then the force exerted on 'B&#...
Tuesday, December 30, 2014 at 12:30am

Physics
Hi! Would one of you please check my work? Thanks! ( I used significant digits, by the way) A student throws a 5.00 kg steel shot directly upwards so that it leaves his hand when it is 2.00 m above the ground. If its velocity is 0.15 m/s when it leaves his hand, calculate: 1....
Monday, December 29, 2014 at 9:13pm

Physics
The work W0 accelerates a car from 0 to 20 km/h. How much work (in terms of W0) is required to accelerate the car from 20 km/h to 100 km/h?
Monday, December 29, 2014 at 7:47pm

I guess this is physics related?
What is the biggest source of error in measuring the acceleration of a ball down a ramp? knowing the length of the ramp accurately measuring the time knowing the height of the ramp knowing the mass of the ball****
Monday, December 29, 2014 at 5:09pm

Physics~ ONE MOREE
Which of the following must the investigator measure during an experiment? independent variable dependent variable <<<<< controlled variable
Monday, December 29, 2014 at 4:58pm

So what about this one bob? Physics
Which of the following is closer to a guess? hypothesis<<<<< law question theory
Monday, December 29, 2014 at 4:53pm

Physics
Which of the following statements is true? A hypothesis always leads to a theory which leads to a law. A hypothesis always leads to a law which leads to a theory. A hypothesis must lead to a theory only. A hypothesis can lead to either a theory or a law. <<<<<&...
Monday, December 29, 2014 at 4:16pm

physics
A 5kg block is placed on an inclined plane raised to an angle with it just started to slip down. if its coefficients of friction is 0.3 calculate. and the speed of the block up to the plane if it is being pull up by a force of 30N
Monday, December 29, 2014 at 10:51am

physics
the speed of an object at the end of 4 successive seconds is 20,25,30 and 35 meters per second,respectively.the acceleration of this object is?
Sunday, December 28, 2014 at 10:07pm

physics
a man having a mass of 60 kg exerts a horizontal force of 200 newton in pushing a 90 kg object a distance of 60 meters along horizontal floor. he does this at constant velocity in 3 seconds.the weight of this man is[in newton,taking g =10m/s square]
Sunday, December 28, 2014 at 10:03pm

physics
How to make a project based on physics laws
Sunday, December 28, 2014 at 1:07am

Physics
Hello! A falling piano reaches a velocity of 120 km/h. Find the kinetic energy if the mass of the piano is 357 kg. Ek= 1/2mv^2 Ek= 1/2(357)(33m/s)^2 Ek= 194386.5 J The problem is that my answer key has the answer 208kJ. What's my error? I have tried this problem many times...
Saturday, December 27, 2014 at 8:54pm

Physics
a 15000 kg airplane descends a vertical distance of 10.0 km over a horizontal distance of 80.0 km. What is the airplane's loss of potential energy. (I'm confused about the height) Ep=mgh m= 15000 kg g= 9.81 m/s^2 h=??
Saturday, December 27, 2014 at 6:53pm

physics
When relaxed, an elastic cord has length L, cross section area A, mass M, and Young modulus Y. An object of mass m is hung from the ceiling using the cord. The system reaches a steady state. What is the longitudinal mass distribution lambda(z) of the stretched cord as a ...
Saturday, December 27, 2014 at 3:13pm

Physics
A ball is thrown straight upward and returns to the thrower’s hand after 2.3 s in the air. A second ball is thrown at an angle of 60◦ with the horizontal. At what speed must the second ball be thrown so that it reaches the same maximum height as the first? The ...
Saturday, December 27, 2014 at 1:55pm

PHYSICS
An automobile accident investigator needs to determine the initial westerly velocity of jeep (m=1720 kg) that may have been speeding before colliding head-on with a Volkswagen (m=1510 kg) that was moving with a velocity of 75.7 km/h east. The speed limit on this road is 90 km/...
Saturday, December 27, 2014 at 1:15pm

Physics
Station Math Two station astronauts will each perform two 8-hour EVAs within 13 days to repair a damaged solar panel that was impacted by a micrometeoroid on the space station. What is the total amount of oxygen needed by the two astronauts to accomplish this? Please put your ...
Saturday, December 27, 2014 at 1:52am

physics
a vertical object placed on a bench is observed to have three shadows of different sharpness,in different directions.explain tha observation
Friday, December 26, 2014 at 3:41pm

physics
A golfer takes two putts to sink his ball in the hole once he is on the green. The first putt displaces the ball 8.70 m east, and the second putt displaces it 6.04 m south. What displacement would put the ball in the hole in one putt? Answer in units of m and.......... ...
Thursday, December 25, 2014 at 8:10pm

physics
Two bodies of mass 3kg and 4kg are suspended at the ends of massless string passing over a frictionless pulley .the acceleration system is
Thursday, December 25, 2014 at 10:21am

Physics
1. What is happening to that air between the instruments and your ears? 2. How can you produce the change in the frequency? 3. Describe how the notes are produced in a violin?
Wednesday, December 24, 2014 at 5:53pm

Physics
Two students (90.0 kg and 60.0 kg) on roller skates face-to-face push against each other. The 90.0 kg student moves at 5.0 m/s just after their hands lose contact. I figured out part A (final velocity of 60.0 kg student) to be 7.5 m/s backward. I need help with part B. (b) ...
Wednesday, December 24, 2014 at 12:52pm

Physics
Problem: As you walk to class with a constant speed of 1.60m/s , you are moving in a direction that is 20.8∘ north of east. Part A How much time does it take to change your displacement by 22.0m east? Part B How much time does it take to change your displacement by 31.0m...
Tuesday, December 23, 2014 at 9:56am

PHYSICS
Design a carnival ride on which standing passengers are pressed against the inside curved wall of a rotating vertical cylinder. It is to turn at most at 1/3 revolution per second. Assuming a minimum coefficient of friction of 0.70 between clothing and wall, what diameter ...
Monday, December 22, 2014 at 9:56pm

physics
Design a carnival ride on which standing passengers are pressed against the inside curved wall of a rotating vertical cylinder. It is to turn at most at 1/3 revolution per second. Assuming a minimum coefficient of friction of 0.70 between clothing and wall, what diameter ...
Monday, December 22, 2014 at 9:16pm

Physics
A clerk moves a box of cans down an aisle by pulling on a strap attached to the box. The clerk pulls with a force of 187.0 N at an angle of 25.0◦ with the horizontal. The box has a mass of 36.0 kg, and the coefficient of kinetic friction between the box and fl...
Monday, December 22, 2014 at 7:24pm

Physics
A bullet is fired vertically upward with an initial velocity of 98m/s from the top of a building 100m high, find a) the maximum height reached above the ground b) the total time before reaching the ground. C) the velocity on landing.
Monday, December 22, 2014 at 12:36am

Physics
A table tennis ball is dropped unto the floor from a height of 4m and it rebounds to a height of 3m. If the time of contact with the floor is 0.01secs, what is the magnitude and direction of the acceleration during the contact
Monday, December 22, 2014 at 12:28am

physics
a force of 200 N is exerted at an angle 30 degrees with respect to the horizontal on an object whose mass is 30kg. the coefficient of friction between the object and the surface is the 0.2.(a)what is the frictional force?(B) what is the acceleration of the object?(c) if the ...
Sunday, December 21, 2014 at 8:22pm

Physics
A 0.0420-kg hollow racquetball with an initial speed of 18.3 m/s collides with a backboard. It rebounds with a speed of 7.4 m/s. Calculate the total impulse on the ball.
Sunday, December 21, 2014 at 7:34pm

Physics
Two objects, one of mass 3kg moving at 2m/s, the other of mass 5kg and speed of 2m/s move towards each other and collide in a head on collision. If the collision is perfectly inelastic, find the speed of the objects after the collision.
Sunday, December 21, 2014 at 7:31pm

physics
120 grams of an unknown metal at a temperature of 95 degrees celcuius is poured into 140 grams of aluminum calorimeter containing 220 grams of water. If the inital temperature of the water and calorimeter was 15 degree celcuius and the final temperature was 18 celcius, find ...
Sunday, December 21, 2014 at 5:35pm

physics
A speeder doing 50.0 mi/hr (about 22 m/s) in a 25 mi/hr zone approaches a parked police car. The instant the speeder passes the police car, the police begin their pursuit. If the speeder maintains a constant velocity, and the police car accelerates with a constant acceleration...
Sunday, December 21, 2014 at 3:00pm

physics
A ball is thrown vertically up from the edge of a 150 m building with a veloicty of 10m/s. (A) how high did the ball rise? (b) how much time did it take fort he ball to reach this height ? (C) what is the velocity oft he ball as it strikest he ground ? (D) how long does it ...
Sunday, December 21, 2014 at 2:34pm

Physics- revolutions
A 0.013 kg rubber stopper attached to a 0.93 m string is swung in a circle. If the tension in the string is 0.70 N, what is the period of the stopper's revolution?
Sunday, December 21, 2014 at 2:24pm

Physics~
The moon's gravity is one-sixth that of the earth. What is the period of a 0.25 m long pendulum on the moon?
Sunday, December 21, 2014 at 1:58pm

Physics
A baseball with mass of 0.145 kg is thrown straight down at the ground. At a particular speed, it has a drag force of 0.4 N acting on it. What is its acceleration at that time? -2.8m/s^2
Sunday, December 21, 2014 at 1:16pm

Physics
A 10.0 kg barrel is lifted by pulling up on a rope. The barrel accelerates at 1.50 m/s2. Find the force of tension on the rope.
Sunday, December 21, 2014 at 12:48pm

physics
a horizontal force of 3 N is excerted on an object while a vertical force of 4 N is excerted at the same time. calculate the resultant force on the object? 3 square + 4 square = 25 so the resultant force will be 25 N
Sunday, December 21, 2014 at 6:35am

physics
two girls exeret a force of 30 N and 10 N on a bag in same direction. a dog tugs at bag and drag it in oppsite direction with the force of 5 N. calculate the new force exerted on bag and draw a vector diagram. F= 10+30 = 40 N dog applied force in opposite direction with 5 N ...
Sunday, December 21, 2014 at 5:19am

Physics- Horizontal Velocity
How do you calculate the horizontal velocity of an object in a projectile problem?
Sunday, December 21, 2014 at 1:32am

physics
A block slides on a rough 45 degree incline .the coefficient of friction the block and incline is µk. what is the ratio of acceleration when the block accelerates down the incline to the acceleration when the block is projected up the incline?
Saturday, December 20, 2014 at 6:38pm

physics
A person can jump to a height of 1.5m on surface of earth. Find the velocity with which he jumps.
Saturday, December 20, 2014 at 6:20pm

physics
explain the terms uniform acceleration and average speed.
Saturday, December 20, 2014 at 6:12pm

physics
A small sphere of mass m is connected to the end of a cord of length r and rotates in a vertical circle about a fixed point O. The tension force exerted by the cord on the sphere is denoted by T . What is the correct equation for the forces in the radial direction when the ...
Saturday, December 20, 2014 at 3:59pm

Physics
What is the purpose of the resonator stringed instrument
Saturday, December 20, 2014 at 1:50pm

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