# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**PHYSICS**

A 3.5 kg block is pushed along a horizontal floor by a force of magnitude 15 N at an angle 40° with the horizontal (Fig. 6-19). The coefficient of kinetic friction between the block and the floor is 0.25. Calculate the magnitudes of (i) the frictional force on the block from ...

*Monday, November 14, 2016 by Carmen*

**Physics**

Two bumper cars crash head on in an elastic collision. One car #1 was moving 2.5 m/s west and car #2 was moving 3.7 m/s east. Each car has a mass of 254 kg. What are the final velocities after the collision? I think this problem is supposed to be solved with m1v1, i + m2v2, i...

*Monday, November 14, 2016 by George*

**Physics**

In projectile motion, what angle would the same distance as a 45 degree angle?

*Monday, November 14, 2016 by Lester*

**Physics**

A person whose weight is W = 658 N is doing push-ups. From his feet to his center of gravity he is 0.840m and from the center of gravity to his hands is 0.410m. Find the normal force exerted by the floor on (a) each hand and (b) each foot, assuming that the person holds this ...

*Sunday, November 13, 2016 by BrookeNeed*

**Physics**

In a fast-pitch softball game the pitcher is impressive to watch, as she delivers a pitch by rapidly whirling her arm around so that the ball in her hand moves in a circle. In one instance, the radius of the circle is 0.622 m. At one point on this circle, the ball has an ...

*Sunday, November 13, 2016 by BrookeNeed*

**Physics**

If a train starts from rest and accelerate at the rate alpha and attains velocity v ,then moves at a constant velocity,then deaccelerates at the rate beta and stops ,if the total distance is found to be l then what is the total time??

*Sunday, November 13, 2016 by Nashif*

**Physics**

Two bumper cars crash head on in an elastic collision. One car #1 was moving 2.5 m/s west and car #2 was moving 3.7 m/s east. Each car has a mass of 254 kg. What are the final velocities after the collision? I think this problem is supposed to be solved with m1v1, i + m2v2, i...

*Sunday, November 13, 2016 by George*

**physics**

What is the direction and magnitude of the net force acting on the hot air balloon? It has an arrow up with 6300, an arrow down with 3200, an arrow to the right of 1350 and an arrow left with 745. Is this how to do it and if so, how do I convert the sin of theta into degrees. ...

*Sunday, November 13, 2016 by Sam*

**physics**

During a crash, a race car driver decelerates from 48.0 m/s to 0 m/s in a distance of 14.9 m. If the drivers mass is 70.0 kg, what is the average force acting on the driver during the crash? This is what I have so far. Am I starting right?

*Sunday, November 13, 2016 by Sam*

**Physics**

A team in Quebec is playing ice baseball. A 72 kg player who is initially at rest catches a 145 g ball traveling at 18 m/s. If the player's skates are frictionless, how much time is required for him to glide 5 m after catching the ball?

*Sunday, November 13, 2016 by OJ*

**Physics**

You demonstrate hitting a board in a karate class. The speed of your hand as it hits the thick board is 14 m/s with respect to the board, and the mass of your hand is about .80 kg. How deep does your hand go into the board before stopping if the collision lasts for 2. X 10^-3 s?

*Sunday, November 13, 2016 by HELP I WANT TO DROP OUT*

**Physics**

An astronaut with a mass of 90 kg (including spacesuit and equipment) is drifting away from his spaceship at a speed o f.2 m/s with respect to the spaceship. The astronaut is equipped only with a 0.5 kg wrench to help him get back to the ship. With what speed and in what ...

*Sunday, November 13, 2016 by Kelsey*

**Advanced physics**

A child on a swing is traveling at 2 m/s as she passes through the lowest part of swing’s arc. What is the period of the motion?

*Sunday, November 13, 2016 by Mona*

**physics**

You decide to use your garden hose to wash your garage door. The water shoots out at a rate of 10 kg/s and a speed of 16 m/s with respect to the hose. When the water hits the garage, its speed decreases to zero. Determine the force that the water exerts on the wall. What ...

*Sunday, November 13, 2016 by Abbie*

**Physics**

A 65-kg astronaut pushes against the inside back wall of a 2000kg spaceship and moves toward the front. Her speed increases from 0 to 1.6 m/s If her push lasta 0.3 seconds what is the average force that the astronaut exerts on the wall of the spaceship?? If the spaceship was ...

*Sunday, November 13, 2016 by Hang*

**physics**

A child is sitting on a stationary skateboard with a pile of rocks which she throws in one direction in order to make the skateboard travel in the opposite direction. If the rocks each have a mass of 0.95 kg and she can throw them with a speed of 19 m/s relative to the ground...

*Sunday, November 13, 2016 by Amy*

**Physics**

a box sliding on a horizontal surface with a speed of 6m/s encounters an incline plane that makes a 15 degree angle with the horizontal line. What is the max distance that will be travelled by the box up the incline before coming to rest if the coefficient of kinetic friction ...

*Sunday, November 13, 2016 by Kayla*

**physics**

A bicycle starts from rest and reaches 6.0 m/s after 4 seconds. What is its acceleration?

*Sunday, November 13, 2016 by maha*

**Physics**

A bowling ball pendulum demonstration goes bad. The 8.0-lb bowling ball is raised to the height of the demonstrators nose, 160 cm above the ground, and releases the bowling ball. When the bowling ball is at the lowest point of the swing (36 inches above the ground), the knot ...

*Sunday, November 13, 2016 by Stuart*

**Physics**

At what other angle (other than 45 degrees) could a gun be fired to travel the same horizontal distance Is the answer: There is not one?

*Sunday, November 13, 2016 by Lester*

**Physics**

A force of 123 N acts on a 10.0kg object for 45.6 meters. If the objects starts at rest, and the surface is flat and frictionless, how fast is the object moving after the force is removed. I got acceleration to be 12.3, but I am not sure how to move on with the problem.

*Sunday, November 13, 2016 by James*

**Physics**

If sound travels at 330m/s in air, how long does it take for sound to travel 10,000m in air? If sound travels at 1500m/s in water, how long does it take for sound to travel 10,000m in water?

*Sunday, November 13, 2016 by Lucyyyyy*

**Physics C: Mechanics**

A 1.00 kg mass is attached to a string wrapped around a cylinder of radius 0.05m. Two masses are connected with a rod and attached to the end of the cylinder, perpendicular to its axis. as the mass falls from rest the rotating contraption spins through 12 pi radians in 1.2 ...

*Sunday, November 13, 2016 by Riya*

**Physics C: Mechanics**

A hollow, thin-walled cylinder and a solid sphere start from rest and roll without slipping down an inclined plane of length 5.0 m. The cylinder arrives at the bottom of the plane 2.6 s after the sphere. Determine the angle between the inclined plane and the horizontal.

*Sunday, November 13, 2016 by Kani*

**physics**

a metal bar 70cm long and 4.00 kg in mass supported on two knief -edge placed 10 cm from each end. a 6.00 kg weight is suspended at 30 cm from one end . find the reaction at the knife-edge ?

*Sunday, November 13, 2016 by nirbhay*

**Physics**

A child pushes a wagon with a passenger of total mass 42 kg along a horizontal surface as fast as the child can run, and then releases the wagon, which continues for another 16 m before stopping. The coefficient of kinetic friction acting to slow the wagon is 0.18. What was ...

*Saturday, November 12, 2016 by Jatin*

**Physics**

A 125-g arrow is shot vertically upward with an initial speed of 28 m/s. Assuming 30% loss in total mechanical energy while ascending, what maximum height above the position from which it was shot does the arrow reach?

*Saturday, November 12, 2016 by Matt*

**physics**

What is the kinetic energy gained by a 500kg car accelerating from rest to 27m/s? 1/2=mv^2 > 1/2(500)(27m/s)^2= 182,250J a. What is the power output in watts of the engine that causes this acceleration in 4.00s? 27m/s*4s= 108m/s^2 1/2(500)(108)= 27,000 Watts b. How many ...

*Saturday, November 12, 2016 by JAY*

**PHYSICS**

Heat transfer Q and work done W are always energy in transit, whereas internal energy E is energy stored in a system. Give an example of each type of energy, and state specifically how it is either in transit or resides in a system.

*Saturday, November 12, 2016 by JAY*

**Physics**

Imagine you are driving a car up Pike’s Peak in Colorado. To raise a car weighing 1000 kilograms a distance of 100 meters would require about a million joules. You could raise a car 12.5 kilometers with the energy in a gallon of gas (if all stored chemical energy was ...

*Saturday, November 12, 2016 by JAY*

**physics**

Rain drops do not accelerate for long terminal speed due to the vicious drag of the air.if this did not happen rain drop would hit us with a dangerous high speed.discuss

*Saturday, November 12, 2016 by ameen*

**Physics - Energy**

An airplane is flying with a speed of 250km/h at a height of 3610m above the ground. A parachutist whose mass is 75.2kg, jumps out of the airplane, opens the parachute and then lands on the ground with a speed of 3.75m/s . How much energy was dissipated on the parachute by the...

*Saturday, November 12, 2016 by Kidd*

**physics**

a uniform wooden beam 10 m long ang weighting 200 N is used to support a load of 300 N on the left end , and 500 N on the right end. Determine the center of the gravity if another load of 80 N is 2 m from the left end

*Saturday, November 12, 2016 by angelan*

**PHYSICS**

To pull a car out of a ditch, one end of the rope POR is tied around a pillar at P and the other end is tied to the car at R. A force of 100N is applied to the Center O of the rope and perpendicular to PR. find the tensions in the rope if the angle POR = 150 degrees

*Saturday, November 12, 2016 by Anonymous*

**Physics**

A car is traveling at 7.0 m/s when the driver applies the brakes. The car moves 1.5 m before it comes to a complete stop. If the car had been moving at 14 m/s, how far would it have continued to move after the brakes were applied? Assume the braking force in both cases is ...

*Saturday, November 12, 2016 by Kayla*

**Physics**

If a racehorse starts from rest and accelerates at a rate of 4.7 m/s2, how long does it take the horse to go 20 m?

*Friday, November 11, 2016 by Brook*

**Physics - Buoyant Force Question**

Find the buoyant force on a helium balloon in air (Standard Pressure and Temperature) if the balloon is spherical with diameter 12.0 cm.

*Friday, November 11, 2016 by Anon*

**Physics - Angular Speed Question**

A merry-go-round can be modeled as a disk with radius 2.5 meters and mass of 150 kg. For this problem, assume the density is uniform. It is initially rotating at 2.0 rad/sec. Two children of mass 30 kg and 40 kg hop onto the merry-go-round and stay near the edge. What is the ...

*Friday, November 11, 2016 by Anon*

**Physics Question**

Find the escape speed from (a) the Sun, (b) a white dwarf star with one solar mass (same as the Sun) and radius 10,000 km, (c) a neutron star of 2.0 solar masses and radius of 10.0 km, and finally (d) a star with 2 solar masses and radius 5930 m. Comment on the speed of part (d).

*Friday, November 11, 2016 by Anon*

**Physics - Tension Question**

A uniform bar of mass 12 kg and length 1.4 m is held by a hinge on a vertical wall. A string is attached to the end so that the bar is in mechanical equilibrium. The angle between the bar and the string is 25o. Find the tension in the string.

*Friday, November 11, 2016 by Anon*

**Physics**

A child on a swing is traveling at 2 m/s as she passes through the lowest part of swing’s arc. What is the period of the motion?

*Friday, November 11, 2016 by Mona*

**Physics**

What is the ratio of the volumes for two black holes whose masses are 20 and 10 times the mass of the Sun, respectively? Assume the ’event horizon’ deﬁnes the edge of each black hole’s ’volume’

*Friday, November 11, 2016 by Rick*

**Physics**

if the area of cross section of a wire in a circuit is doubled its resistivity? (a)becomes one fourth,(b) becomes half (c) remains the same (d) doubles. Exlpain please?

*Friday, November 11, 2016 by Mumtaz*

**Physics**

A hamster is pushed off a cliff by wind. Its mass is 0.040 kg and has a Potential Energy of 98 J. Find the kinetic energy...

*Friday, November 11, 2016 by Anonymous*

**Physics**

A hamster is pushed off a cliff by wind. Its mass is 0.040 kg and has a Potential Energy of 98 J. Find the kinetic energy.

*Friday, November 11, 2016 by Bob*

**Physics**

A typical candy bar contains 300 kilo-calories of energy. if all the energy released by eating the candy bar could be used to do work in lifting a 1000 kg car, how high could it be lifted?

*Thursday, November 10, 2016 by Thomas*

**Physics**

A motor takes 5 s to go from 30 rad/s to 130 rad/s at constant angular acceleration. The total angle through which its shaft turns during this time is... A. 400 rad B. 320 rad C. 640 rad D. 800 rad E. 1600 rad F. None of the above

*Thursday, November 10, 2016 by Tanner*

**Physics**

The orbital period of the moon about the earth is approximately 27.3 days. given that the average earth-moon distance is 384,000 kilometers, predict the moon's speed using the expression for centripetal force and the gravitational force, setting them equal to each other.

*Thursday, November 10, 2016 by max*

**Physics**

Use the Law of conservation of energy to predict the final speed of a bowling ball dropped from the top of a 25.0 m tall building just before hitting the ground. ignore air resistance.

*Thursday, November 10, 2016 by lexi*

**Physics**

Consider two fly wheels labeled A and B both of which are spinning with the same angular velocity. Each flywheel consists of two small heavy spheres connected by very light rods to a light axis. Flywheel A has spheres of mass 2m, each a distance R from the axis. Flywheel B has...

*Thursday, November 10, 2016 by Tyler*

**Physics**

A bar of length 2L can rotate about a frictionless axle at its center. The bar is initially at rest and is then acted on by the three forces shown. What is the magnitude of the net torque on the bar?

*Thursday, November 10, 2016 by Amanda*

**Physics**

a pendulum of length (L) = 1m swings through an angle 20 deg. What is the length (d) of the path traveled by the pendulum mass?

*Thursday, November 10, 2016 by PLEASE HELP*

**Physics**

An astronaut throws a ball with mass m to the right with speed v. It strikes the wall of the space station and rebounds, moving left with a speed V/2. What was the magnitude of the impulse of the ball caused by the collision?

*Thursday, November 10, 2016 by Courtney*

**Physics**

In DESPERATE NEED OF HELP!!! An object of mass m = 10 kg and speed v = 2 m/s collides head on with a second object of mass m = 5 kg which has a speed v = 1 m/s. The objects stick together. There are no external forces on the two objects (note the given "v"s are the speeds, not...

*Thursday, November 10, 2016 by Carl*

**Physics**

an astronaut throws a ball with mass m to the right with speed v. It strikes the wall of the space station and rebounds, moving left with a speed V/2. What was te magnitude of the impulse of the ball caused by the collision? Any help would be greatly appreciated

*Thursday, November 10, 2016 by Brandon*

**Physics**

A pair of objects with masses 3m and m are connected by a hook and have a massless compressed spring between them. Initially the objects are at rest. Then the hook unlatches, the spring expands to its released length and the larger mass is then found moving left with speed v. ...

*Thursday, November 10, 2016 by Jordan*

**Physics**

An object consists of 5 masses, each of mass m, connected by massless rods. The two short rods have length L and the two long rods have length 2L. What is the moment of inertia about an axis perpendicular to the diagram (out of the page) and through the mass labeled x (the ...

*Thursday, November 10, 2016 by Samantha*

**Physics**

A mass m = 1 kg initially at rest at height h = 2m slides to the bottom of a 45 ramp. there is no friction between the mass and the ramp. At the bottom of the ramp the speed of the mass is 4 m/s. How much heat was generated by the friction as the mass slides down the ramp? Any...

*Thursday, November 10, 2016 by Bobby*

**Physics**

A motor lifts an elevator of mass m at constant speed. The power output of the motor is P and there are no frictional losses so that all the power output from the motor goes into lifting the elevator mass. What is the correct expression for the time required for the motor to ...

*Thursday, November 10, 2016 by Bobby*

**Physics**

Searches related to a motor lifts an elevator of mass m at constant speed. The power output of the motor is P and there are no frictional losses so that all the power output from the motor goes into lifting the elevator mass. What is the correct expression for the time ...

*Thursday, November 10, 2016 by Bobby*

**Physics science**

A 10 ohm, 20 ohm lamp and 12v battery are connected in a parallel. A current of 1.8 A passes through the battery and a current of 1.2 A passes through the motor. 1) Determine the current through the lamp. 2) Calculate the potential difference across the motor. 3) is this the ...

*Thursday, November 10, 2016 by Tina*

**Physics**

An snowboard manufacturer wants to make the smoothest boards ever, she believes that can be achieved by reducing friction as much as possible. Describe 3 things that could be change on a board so that friction between it and the ice gets smaller.

*Thursday, November 10, 2016 by Abner*

**Physics**

you pull your 6kg dog on a sled which has a mass of 15kg. while you are pulling at 33N, there is a 12N frictional force that is encountered. what is the acceleration of your sled and dog?

*Thursday, November 10, 2016 by Molly*

**physics multiple choice MCQ 7- i need help please @all respective sir & bro**

the unit of energy in S.I units is? a. watt b. joule c. joule/s d. joule/m e. joule m

*Thursday, November 10, 2016 by hi bro it's me ( ^_^) himel@,Damon ,Steve,Henry. ,Ms.Sue .bobpursley& all respect sir*

**physics multiple choice MCQ 5- i need help please @all respective sir & bro**

The unit of time in S.I. units is? a. second b. minute c. hour d. day e. year

*Thursday, November 10, 2016 by hi bro it's me ( ^_^) himel@,Damon ,Steve,Henry. ,Ms.Sue . bobpursley& all respect sir*

**physics multiple choice MCQ 3- i need help please @all respective sir & bro**

q3= The unit of temperature in S.I units is? a. Centigrade b. Celsius c. Fahrenheit d. kelvin e. Rankin

*Thursday, November 10, 2016 by hi bro it's me ( ^_^) himel@,Damon ,Steve,Henry. ,Ms.Sue .bobpursley& all respect sir*

**physics multiple choice MCQ 2- i need help please @all respective sir & bro**

which of the following laws is applicable for the behavior of a perfect gas? a. Boyle's law b. Charles' low c. Gay-Lussac law d. all of the above e. joule's law

*Thursday, November 10, 2016 by hi bro it's me ( ^_^) himel@,Damon ,Steve,Henry. ,Ms.Sue .bobpursley& all respect sir*

**physics multiple choice MCQ 1- i need help please @all respective sir & bro**

which of the following variable controls the physical properties of a perfect gas? a. pressure b. temperature c. volume d. all of the above e. atomic mass

**physics**

A ball is thrown vertically upwards from ground level hits the ground after 4secs, calculate the maximum hieght it reached during its journey.

*Thursday, November 10, 2016 by chelsey*

**Physics**

query=a stone of mass 30grams is placed in a measuring cylinder containing some water. the reading of the water level increases from 50cm cubic to 60cm cubic. what is the density of the stone?

*Thursday, November 10, 2016 by Matthew*

**Physics**

A simple Atwood’s machine uses a massless pulley and two masses m1 and m2. Starting from rest, the speed of the two masses is 8.2 m/s at the end of 2.2 s. At that time, the kinetic energy of the system is 30 J and each mass has moved a distance of 9.02 m. Find the value of ...

*Thursday, November 10, 2016 by Jenny*

**physics 1**

Q4= The unit of mass in S.I. unit is? a. kilogram b. gram c. tonne d. quintal e. newton

*Thursday, November 10, 2016 by hi bro it's me ( ^_^) himel@,Damon ,Steve,Henry. ,Ms.Sue & all respect sir*

**physics**

A loop of surface area s1=10cm^2 placed ina uniform magnetic field Bof magnitude B1=8×10^-2T, has its plane perpendicular to the field lines . A second loop of area s2=15cm^2 is placed in another uniform field B2 of magnitude B2=0.1T such that its normal unit vector n makes ...

*Thursday, November 10, 2016 by angy*

**physics**

a car travels at 25m/s on a slick road takes 4 second to come to a complete stop. what was the car's average acceleration over 4 second?

*Thursday, November 10, 2016 by lala*

**Physics**

2. When traveling down the road at a constant speed of 55 mph, 26.4 m/s, the tangential velocity of the wheels is also 55 mph. If a car tire is 65.0 cm in diameter, then; a. What is the period and frequency of the spinning car tire? b. What is the centripetal acceleration of a...

*Thursday, November 10, 2016 by Cris*

**Physics**

A 2.5m long string vibrates as a 100 Hz standing wave with nodes at 1m and 1.5m from one end of the string and no points in between the two.Which harmonic is this?work out

*Thursday, November 10, 2016 by Anonymous*

**Physics**

A jet plane traveling 1890 km/h (525 m/s ) pulls out of a dive by moving in an arc of radius 5.20 km What is the plane's acceleration in g's?

*Wednesday, November 9, 2016 by Stuck*

**Physics**

Two parallel straight wires are 1 meter apart. Each wire carries a current of 2 Amperes in the same direction. What is the resultant magnetic field produced by both wires at a point: 2) 1/4 of the distance between them I don't really understand what 2 is saying to be real ...

*Wednesday, November 9, 2016 by Jo*

**Physics**

Blocks with masses of 1 kilogram, kilogram, and 3 kilogram are lined up in a row on a frictionless table. All three are pushed forward by a 12 Newton Force applied to the 1 kilogram block. Draw a free body diagram of all 3 blocks. How much force does the 2 kilogram block ...

*Wednesday, November 9, 2016 by Anonymous*

**Physics**

A brave but inadequate rugby player is being pushed backward by an opposing player who was exerting a force of 800 Newtons on him. The mass of the losing player plus the equipment is 90 kilograms and he is accelerating at 1.2 meters per second backward. How would I sketch the ...

*Wednesday, November 9, 2016 by Anonymous*

**Physics**

A raft is made of 15 logs lashed together. Each is 30.0 cm in diameter and has a length of 7.00 m. How many people (whole number) can the raft hold before they start getting their feet wet, assuming the average person has a mass of 66.0 kg? Do not neglect the weight of the ...

*Wednesday, November 9, 2016 by Kayla*

**Physics**

A 1500 kilogram car skids to a hold on a wet road where the coefficient of kinetic friction is 0.5. How fast was the car traveling if it leaves 65 meter long skid marks?

*Wednesday, November 9, 2016 by Anonymous*

**Physics**

For the object in the preceding problem, what magnitude torque is necessary to give the object an angular acceleration of 1.5 rad/s^2 a) along the x-axis? b) along the y-axis? c) along the z-axis (perpendicular to the page, passing through the origin)? Help please! Use the ...

*Wednesday, November 9, 2016 by Anonymous*

**Physics**

A clock has a second hand which rubs against the inside of the glass cover. If the frictional force between the glass cover and the tip of the hand is 0.0020 N and the length of the hand is 8 cm, what minimum torque must be supplied to the hand by the clock mechanism if the ...

*Wednesday, November 9, 2016 by Anonymous*

**Physics**

A certain number of identical resistors are connected in series and their total resistance is measured. When the resistors are disconnected and re-connected in parallel, their total resistance drops to one-percent of the value measured when they were connected in series. How ...

*Wednesday, November 9, 2016 by Tim*

**physics**

Blood flows in an aorta of radius 4.12mm at 35.0cm/s. Calculate the volume flow rate. Although the cross-sectional area of a capillary is much smaller than that of the aorta, there are many capillaries, so their total cross-sectional area is much larger. If all the blood from ...

*Wednesday, November 9, 2016 by taylor*

**physics**

a car with a mass of 1.50 x 10^3 kg starts from rest and acceleration to a speed of 18.0 m/s in 12.0 s. Assume that the force of resistance remains constant at 400.0 N during this time. What is the average power developed by the cars engine

*Wednesday, November 9, 2016 by sharon*

**Physics**

Water at a pressure of 4.20 atm at street level flows into an office building at a speed of 0.65 m/s through a pipe 6.60 cm in diameter. The pipes taper down to 2.20 cm in diameter by the top floor, 28.0 m above. Calculate the water pressure in such a pipe on the top floor in ...

*Wednesday, November 9, 2016 by Trish*

**Physics**

A tennis ball is thrown with a velocity of 30m/s at an angle of 60^ of the horizontal calculate the time,m/s,and the range

*Wednesday, November 9, 2016 by Samuel*

**physics!!!!**

There is a two member dog sled team pulling with all their strength in the middle of a snow storm. Dog A is pulling with a force of 178 N at 15ð‘œ and Dog B is pulling with 225 N at âˆ’10ð‘œ . The sled and gear weigh 980 N and has a coefficient of friction of 0...

*Wednesday, November 9, 2016 by Jackie*

**Physics**

A quarterback throws a spiral to a receiver that is 40m away. The football has a spin of 14 rev/s and went through 58 revolutions before being caught. if the ball is caught at the same height it was thrown at, at what velocity and at what angle should the quarterback throw the...

*Wednesday, November 9, 2016 by Jack*

**Physics**

two charges of 40 microc and -20 micro c are placed at a certain distance apart. they are touched and kept at the same distance.the ratio of their initial to the final force between them is

*Wednesday, November 9, 2016 by Xyz*

**physics 101**

You drive your car at a speed 40km/h for 1 hour, then slow down to 30km/h for the next 20km. How far did you drive, and what was your average speed?

*Wednesday, November 9, 2016 by Nuri*

**Physics**

A bullet fired in a horizontal direction with muzzle velocity 300m/s. In the absence of air resistance, a) how far will it have dropped in travelling a distance of 20m. b) how far will it have dropped in one second

*Wednesday, November 9, 2016 by Mokut*

**Physics**

Hooke's law states that the distance, d, a string is stretched varies directly with the force, F, applied to the spring. If a force of 12 pounds stretches a spring 3 inches, how far will the spring stretch when a force of 30 pounds is applied?

*Wednesday, November 9, 2016 by Rizza Mae*

**physics**

A 400-gram package lying on a horizontal surface is attached to a horizontal string which passes over a smooth pulley. When a mass of 200 grams is attached to the other end of the string, the package is on the point of moving. Find the coefficient of friction.

*Wednesday, November 9, 2016 by Rheabelle*

**Physics**

How much energy W needed to compress a spring from 15 cm to 10 cm if the constant of the spring is 150 N/m.

*Wednesday, November 9, 2016 by Rizza Mae*

**physics**

A 5kg box on a horizontal table is pushed by a horizontal force of 15N. If the coefficient of friction is 0.4, will the box move? what is the smallest force that could make the box slide along the table?

*Wednesday, November 9, 2016 by Rheabelle*

**Physics: Centre of Mass**

Three masses of 4.0 kg, 5.0 kg and 7.0 kg are located on a line at positions +4.0, +8.0, and -5.0 in meters from the origin, respectively. Where is the center of mass of these three masses? With respect to the origin as x = 0, I calculated the center of mass to be: (4.0 kg)*(4...

*Tuesday, November 8, 2016 by Bob*

**PHYSICS**

A 15 M LENGTH OF HOSE IS WOUND AROUND A REEL WHICH IS INITIALLY AT REST. THE MOMENT OF INERTIA OF THE REEL OF 0.44KGM^2 AND ITS RADIUS IS 0.160M. WHEN THE REEL IS TURNING FRICTION AT THE AXLE EXERTS A TORQUE OF MAGNITUDE 3.40NM ON THE REEL. IF THE HOSE IS PULLED SO THAT THE ...

*Tuesday, November 8, 2016 by kassy*