# Homework Help: Science: Physics

## Recent Homework Questions About Physics

**Physics**

An aluminum (with Young's modulus 7 x 10^10 Pa) rail is 88.0 m long and has cross-sectional area 0.00050 m^2. The rail is fixed at one end and a 4000 N force is applied at the other end. By how much does the bar stretch?

*Sunday, November 27, 2016 by Mary*

**Physics**

A brick of mass 2kg just begins to slide down an inclined plane at an angle of 45 degree with horizontal.what will be the force of friction

*Sunday, November 27, 2016 by Anonymous*

**Physics**

Block A, with a mass of 10 kg, rests on a 36.9° incline. It is attached to a string that is parallel to the incline and passes over a massless, frictionless pulley at the top. Block B, also with a mass of 10 kg, is attached to the dangling end of the string. The two blocks ...

*Sunday, November 27, 2016 by ANON*

**Physics**

A substance has the following properties; Boiling Point = 140 °C, Freezing Point = -10 °C, specific heat as a gas, liquid and solid, 0.3 cal/g.C°, 1.8 cal/g.C° and 0.8 cal/g.C° respectively. Heat of fusion =100 cal/g and heat of vaporization = 480 cal/g. How much heat ...

*Sunday, November 27, 2016 by Clarity*

**physics**

a certain force gives m1 an acceleration of 12m/s^2 the same force gives object m2 an acceleration 3.3m/s^2. wahty acceleration gives to an object having mass(A) the difference m1 and m2 (B)the sum of m1 and m2

*Sunday, November 27, 2016 by jino*

**Physics**

(a) Would the pattern change if you were to use a shorter wavelength of light? Clearly state what change(s) would occur (if any) and briefly explain why. (b) The apparatus is surrounded by air. Would the pattern change if it were immersed in water instead? Clearly state what ...

*Saturday, November 26, 2016 by Po*

**physics**

An airplane is flying above the Earth's surface at a height of 9.30 km. The centripetal acceleration of the plane is 18.2 m/s2. What is the angular velocity of the plane moving in uniform circular motion? Take the radius of the earth to be 6400 km.

*Saturday, November 26, 2016 by Please help*

**Physics**

A tension spring opposes being stretched, but offers no resistance to being compressed (think of a slinky!). A tension spring, with an equilibrium length of 1.25 m, is suspended by one end from a ceiling at a height of 2.5 m above the ground; a mass of 100 g is attached to the...

*Saturday, November 26, 2016 by Nick*

**physics**

A pendulum clock has a pendulum shaft made of aluminum which has a coefficient of linear expansion of 24.0*10^-6K^-1. At 22 degrees celsius the period of the swing of the pendulum is 1.00seconds. If the temperature is reduced to 5 degrees celcius, how much time does the clock ...

*Saturday, November 26, 2016 by dan*

**Physics**

A satellite orbits the Earth in an orbits 750 km high. Find (*) the satellite's orbital speed and (**) period. (The mass and radius of the Earth are 5.98E + 24 kg and 6370000 m, respectively.)

*Saturday, November 26, 2016 by Mary*

**Physics**

A bank robber, after completing his heist, jumps into his getaway car and drives away from the scene of a crime, down a straight highway at 40 m/s. A police vehicle follows in pursuit, leaving the bank 2 minutes after the robber left. If the police travel at 42 m/s, how much ...

*Saturday, November 26, 2016 by Wei*

**Physics**

If the angle of incidence is 30degree and refractive index is 2 find the angle of refraction.find whether the medium is denser or rarer

*Saturday, November 26, 2016 by Anonymous*

**Physics , static fluids**

The density of ice is ρ(ice) = 920 kg/m3, and the average density of water is ρ(water) = 1.00 g/cm3. What fraction of the total volume of a block of ice is exposed when floating in water? what does this even mean?

*Saturday, November 26, 2016 by Andrea*

**Physics**

A plank 3m long and having a mass of 20kg is supported at its ends. Imagine that a person with a mass of 50 kg stands m from one end. What are the magnitudes of the force exerted by the supports?

*Saturday, November 26, 2016 by Josh*

**Physics , static fluids**

A particular object weighs 313 N in air and 264 N when immersed in alcohol of density 0.70 g/cm3. What is the volume (in L) and the density (in kg/m3) of the object? I had origionally used the 264N as the force of buoyancy and did the Fb=density*volume*g, then solved for ...

*Saturday, November 26, 2016 by Andrea*

**Physics , static fluids**

hello, I hope you can help... A diver accustomed to standard snorkel tubing of length 25 cm tries a self-made tube of length 8.6 m. During the attempt, what is the pressure difference (in kPa) between the external pressure on the diver's chest and the air pressure in the diver...

*Saturday, November 26, 2016 by Andrea*

**Physics**

A diver accustomed to standard snorkel tubing of length 25 cm tries a self-made tube of length 8.6 m. During the attempt, what is the pressure difference (in kPa) between the external pressure on the diver's chest and the air pressure in the diver's lungs? I've been trying to ...

*Saturday, November 26, 2016 by Andrea*

**Physics**

A playground merry–go–round has a mass of 118 kg and a radius of 1.80 m and it is rotating with an angular velocity of 0.470 rev/s. What is its angular velocity after a 20.0–kg child gets onto it by grabbing its outer edge? The child is initially at rest.

*Friday, November 25, 2016 by Anonymous*

**Physics**

Jacob is a little too excited about finishing his homework and throws his hands up in the to shout, "I'm done!" He accidentally drops his 2.3 kg pencil straight down from a height of 2.12 m. what will be the kinetic energy of the pencil just before it hits the ground?

*Friday, November 25, 2016 by Anonymous*

**Physics**

Jacob is working on his physics portfolio and stands on a 0.45m high step. If Jacob’s mass is 103kg, what is his potential energy while on top of the step? Givens: Unknown: Equation: Substitute: Solve:

*Friday, November 25, 2016 by Anonymous*

**Physics**

A catapult of a spring constant 100N/M contains 2.0J of elastic potential energy when it is pulled back. What is the extension of the rubber band? I know that E= F/K but I don't know how to work out the force from the information provided, help would be much appreciated, thanks

*Friday, November 25, 2016 by Holly*

**Physics**

A siren emits a sound of frequency 1200 kHz. With which frequency is it received by a car moving at a speed of 20 m/s. a) Away from the siren? b) Towards the siren?

*Friday, November 25, 2016 by Rita*

**Physics y.s.n.**

A body start with an initial velocity of 10metre per second move along the straight line with constant acceleration and the velocity of the body is 50 metre per second the acceleration is reversein the direction find the velocity of the particle as it reach the starting point

*Friday, November 25, 2016 by Nisha*

**physics**

an aeroplane has a mass of 15 tonnes. At cruising speed,air flows over the top of it's wing at 150 m/s and under the wing at 120m/s. Calculate the pressure in difference between the top and the bottom of the wing and the surface area underside the wing

*Friday, November 25, 2016 by Kay*

**Circuits and electronics applications3**

One way to model a vehicle is as a massive object that is connected by springs and shock absorbers to the wheels. Here is a simple model: There is a mass m suspended by a spring with spring constant k and a oil-filled shock-absorber with viscous friction constant b over a ...

*Friday, November 25, 2016 by sengeni*

**Physics, Class XI**

If a force of 15 kg. weight acts on a mass of 14 kg, what will be its velocity after 8 seconds? What is the process to apply the formulas in this question? Please help me fast!

*Friday, November 25, 2016 by Ritu*

**Physics**

If a force of 15kg. wt acts on a mass of 14 kg, what will be its velocity after 8 seconds?

*Friday, November 25, 2016 by Ritu*

**Physics**

Two glass microscope slides, of length 10 cm, are in contact at one end and separated by a sheet of paper at the other end, which creates a wedge-shaped film of air. The thickness of the paper is t = 59 μm, and the glass has index of refraction n = 1.5. Light with wavelength ...

*Friday, November 25, 2016 by Po*

**Physics**

Find the resultant of 50 N acting east and 30 N acting 30 degrees northeast

*Friday, November 25, 2016 by Ilith*

**physics**

a body of massb20kg slides down a plane inclined at 30degree to the horizontal if a constant resting force of 40N act on the body it acceleration down the plane is what? f=mgsin ma=mg sin 20×a=20×10sin30 20a=100 a=50

*Thursday, November 24, 2016 by favour*

**physics**

a body of massb20kg slides down a plane inclined at 30degree to the horizontal if a constant resting force of 40N act on the body it acceleration down the plane is what?

*Thursday, November 24, 2016 by favour*

**math,physics,chemisty,biology**

the number of moles of H2O2 required to completely react with 400ml of 0.5N KMnO4 in acidic medium are

*Thursday, November 24, 2016 by Chanchal*

**Momentum physics 11 conceptual question**

A pitcher throws a fastball to a catcher. assume the speed of the ball does not change Which player exerys the larger impulse on the ball Which player exerts the larger force on the ball?

*Thursday, November 24, 2016 by Penny*

**physics**

To test the speed of a bullet, you create a pendulum by attaching a 5.40 kg wooden block to the bottom of a 2.40 m long, 0.700 kg rod. The top of the rod is attached to a frictionless axle and is free to rotate about that point. You fire a 10 g bullet into the block, where it ...

*Thursday, November 24, 2016 by jasmine*

**physics**

Two blocks are connected by massless string that is wrapped around a pulley. Block 1 has a mass m1=6.50 kg, block 2 has a mass m2=2.50kg, while the pulley has a mass of 1.40 kg and a radius of 22.0 cm. When the pulley turns, there is friction in the axel that exerts a torque ...

*Thursday, November 24, 2016 by jasmine*

**Physics**

A bike wheel is spun until it reaches an angular velocity of 2.00 rad/s. It was spun for 1.96 s. What was its change in angle during this time if it started from rest?

*Thursday, November 24, 2016 by Physics Lover*

**physics**

A 0.200 m long string that has a ball attached to it is spinning around on a flat horizontal plane. It spins over a 116° angle in 0.360 s. What is the centripetal acceleration of the ball if it is in uniform circular motion?

*Thursday, November 24, 2016 by Physics Lover*

**Physics**

A merry-go-round has an angular velocity of 5.20 rad/s. A ribbon is tied at the end of one of the arms and it has speed of 3.60 m/s. At what distance is the ribbon from the center of the merry-go-round?

*Thursday, November 24, 2016 by Physics Lover*

**physics**

A ladder has a weight of 400 N and a length of 10.0 m, it is plac s over a wall without friction. A person whose wight is of 800N stands in the ladder and is 2m from the bottom of the ladder, which is 8 m over the inferior part of the wall. Calculate the force that the wall ...

*Thursday, November 24, 2016 by Leela*

**physics**

A liquid stands at the same level in the u-Tube when at rest what will the difference in height h of the liquid in the two limbs of the u-Tube, when the system is given An acceleration a towards right? take a as area of a cross section and G as the acceleration due to gravity

*Thursday, November 24, 2016 by vijay kumar*

**Physics**

A truck travelling at 50 kph. It brakes retarding it at 5 m/sec. How long it will take up to stop the truck? What distance reached it when it finally stop?

*Thursday, November 24, 2016 by Ilith*

**physics**

a bullet is fired into a trunk of a tree losses1/4 kinetic energy in travelling distance of 5cm .before stopping it travels a further distance of ....

*Thursday, November 24, 2016 by vasu*

**Physics**

Two questions and a small confusion that is not letting me do my homework: When is said that an object is rotating it is mandatory that the addition of rotational momentums gives 0? Under what conditions, two forces of same magnitude but different direction exerted in a body, ...

*Thursday, November 24, 2016 by Kim*

**physics**

A student uses spring balance of range 500gwt. He records the weight of a small iron cube of mass 100g in air, in tap water and in a concentrated solution of common salt in water. His three readings taken in the goben order are w1,w2,w3 his measurement is

*Thursday, November 24, 2016 by hari*

**physics**

a particle starts from rest and travels a distance x with uniform acceleration, then it travels a distance 2x with uniform speed ,finally it travels a distance of 3x with uniform retardation and comes to rest. If the whole motion of the particle is a straight line, then the ...

*Thursday, November 24, 2016 by hari*

**Physics**

A 5kg ball is dropped from a height of 10m a) find the initial potential energy of the ball B. Find the kinetic energy of the ball just before it reaches ground. C. Calculate the velocity before it reaches the ground.

*Thursday, November 24, 2016 by Tejika Bajaj*

**Physics**

A bullet of mass .03 kg moving with a speed of 400m/s penetrates 12cm into a fixed block of wood calculate the average force exerted by the wood on the bullet.

*Thursday, November 24, 2016 by Tejika Bajaj*

**physics**

A stone of 400g is whirled by a string of length 2.8m so that it moves in horizontal circle of radius 0.7m.find the tension on the string.

*Wednesday, November 23, 2016 by valenten*

**Physics**

Suppose that at least 14.7 eV is needed to free an electron from a particular element, i.e., to ionize the atom. What is the lowest frequency photon which can accomplish this? And, what is the corresponding wavelength for that photon?

*Wednesday, November 23, 2016 by Niki*

**physics**

a curve along the highway is to be banked for traffic expected to move at 80km/hr. find the angle of banking if the radius of the curve is 100 meters

*Wednesday, November 23, 2016 by denver*

**Physics**

A water tank is 20 metre Doon Ek Baar water barometer is estimated that Palace then what is the pressure at the bottom of the tank in atmosphere

*Wednesday, November 23, 2016 by Vijay*

**Physics**

A water tank is20m deep if the water barometer reads10m at that place then what is the pressure at the bottom of the tank in atmosphere

*Wednesday, November 23, 2016 by Vijay*

**Physics**

A force F =(8.700 N)i +(−9.000 N)j F→=(8.700 N)i +(−9.000 N)j is exerted on a particle located at r=(−8.400 m)i +(7.700 m)j r→=(−8.400 m)i +(7.700 m)j. What is the torque on the particle about the origin?

*Wednesday, November 23, 2016 by Grace*

**physics**

A boy has a mass 40kg and a girl of mass 30kg play on a see-saw, where must the girl sit to make it balance?

*Wednesday, November 23, 2016 by atiyya*

**physics**

A girl uses a spanner of length 20cm to tighten a nut. IF she pulls at right angles to the end of the spanner with a force of 50N, calculate the moment of her pull

*Wednesday, November 23, 2016 by atiyya*

**Physics**

How could you use 100 pounds of force to lift a 200 pound weight? Explain precisely, listing any necessary distances and details. (This will take some converting!) I don't understand this question, could someone please help me? I think I only need the distances from the ...

*Wednesday, November 23, 2016 by Nathaly*

**Science Physics**

An air plane flies 20 km in a direction 60 degree west of north then 40 km straight east and then 10 km in a direction 30 degree north of east . How far and at what direction is the plane from the starting point?

*Wednesday, November 23, 2016 by Kundan Subedi*

**Physics**

How could you use 100 pounds of force to lift a 200 pound weight? Explain precisely, listing any necessary distances and details. (This will take some converting!) I don't understand this question, could someone please help me? I think I only need the distances from the ...

*Wednesday, November 23, 2016 by Nathaly*

**Physics**

You are given five identical resistors each of resistance r. How can you arrange all these resistors (in series, in parallel, or both) in order to have an equivalent resistance of 7r/2, 7r/3 or 2r

*Wednesday, November 23, 2016 by Sarah*

**physics**

Find the gravitational force of attraction between two balls each weighing 10 kg,when placed at a distance of 1 meter apart

*Wednesday, November 23, 2016 by saddam*

**physics**

Does the kinetic energy of a car change more when it speeds up from 10 to 15 m/s or from 15 to 20 m/s? Explain.

*Wednesday, November 23, 2016 by Anonymous*

**physics**

Does the kinetic energy of a car change more when it speeds up from 10 to 15 m/s or from 15 to 20 m/s? Explain.

*Wednesday, November 23, 2016 by Anonymous*

**Physics**

While analyzing a sample of one, geologist finds that it weighs 2n in air and 1.3N when immersed in water. Calculate the density of the one

*Wednesday, November 23, 2016 by Jenner*

**Physics**

A ball thrown downward with an initial velocity of 20m/s.what will be itsvelocity after 5s

*Wednesday, November 23, 2016 by Subhasong*

**Physics**

A 5 gm bulet initial velocity is 300ms-1 and after penetrating a 5cm plank then the bulet stopped . So how much time is needed to penetrate the plank..?

*Wednesday, November 23, 2016 by Alvi*

**vertical motion physics**

a body projected vertically up from ground crosses a point Pafter 4 seconds and again after 6 seconds Maximum height reached by that body above the ground is (g=10m/s)

*Wednesday, November 23, 2016 by devi*

**physics**

Two forces are applied to a 0.5 kg hockey puck causing it to accelerate. The first force has a magnitude of 10.0 N and is applied to the puck at an angle of 80 degrees with respect to the x axis. The second force has a magnitude of 3.5 N and is applied to the puck at an angle ...

*Tuesday, November 22, 2016 by Mark*

**Physics**

A 238U nucleus is moving in the x-direction at 5.0x10^5m/s when it decays into an alpha particle (4He) and a 234Th nucleus. The alpha moves at 1.4x10^7 m/s at 22 degrees above the x-axis. Find the recoil velocity of the thorium. I know that the original x momentum is 238*5.0*...

*Tuesday, November 22, 2016 by Cristina*

**Physics**

A 103kg SWAT team member descends a 27.5m cable attached to a helicopter. If he wishes to reach the bottom in 3.5s, what average force should he apply to the cable?

*Tuesday, November 22, 2016 by Anonymous*

**Physics**

an upward force of 45.0N is applied to catch a falling girl's bowling ball with a mass of 5.45kg(12lb). What is the acceleration of the ball

*Tuesday, November 22, 2016 by Li Jun Heum*

**Physics**

Two identical loudspeakers are 2 m apart. A person stands 4.6 m from one speaker and 3.4 m from the other. What is the lowest frequency at which destructive interference will occur at this point?

*Tuesday, November 22, 2016 by Joshua*

**physics**

Specific heat capacity of a certain metal is found by heating the metal and then placing it into water which is in a container made of the same material. The metal has mass of 100g and is heated to 100 degrees celsius. The container has mass of 200g and contains water of 500g ...

*Tuesday, November 22, 2016 by Micheal*

**sir damon i need u help physics**

The equation y=As in(wt-kx)represents a plane wave traveling along the x-direction. If a=0.10m, w=8500hz and k=25/secs......Calculate the speed of the Waves -Calculate the speed of the medium through which the wave is travelingl -What is the equation of the reflected wave ...

*Tuesday, November 22, 2016 by ....*

**Physics**

A 12000 kg truck strikes the back end of a 750 kg car moving at 15 m/s. If the truck loses 7500 kg-m/s of its momentum to the car, what is the car's velocity after the collision? I'm not sure how to solve this one... Help please?!

*Tuesday, November 22, 2016 by Emilee*

**physics**

How many minutes would it take a radio wave to travel from the planet Venus to earth?

*Tuesday, November 22, 2016 by Musiyab Awan*

**physics**

A 1 meter long rod of diameter 1 cm supports a hanging mass of 10^4kg. The rod stretches by 6.2 mm. What is Young's modulus for the rod?

*Tuesday, November 22, 2016 by Diane*

**physics need help anybody**

The equation y=As in(wt-kx)represents a plane wave traveling along the x-direction. If a=0.10m, w=8500hz and k=25/secs......Calculate the speed of the Waves -Calculate the speed of the medium through which the wave is travelingl -What is the equation of the reflected wave ...

*Tuesday, November 22, 2016 by ....*

**PHYSICS URGENT!!!**

Consider a solid ball of mass m = 50g and is placed on a long flat slope that makes an angle of 30° to the horizontal. The ball was initially at rest and was then released such that it rolled down the slope without slipping. With a detailed explanation of your method ...

*Tuesday, November 22, 2016 by Shoaib*

**Physics**

A steel spring is hung vertically. Using a ruler, the lower end of the spring was measured to be 25.0cm from its upper end. However, when an object of mass 0.500kg it attracted to the lower end of the spring the spring stretches to a new length of 45.0cm. With the aid of a ...

*Tuesday, November 22, 2016 by grace777*

**PHYSICS PLEASE HELP ME**

Consider a solid ball of mass m = 50g and is placed on a long flat slope that makes an angle of 30° to the horizontal. The ball was initially at rest and was then released such that it rolled down the slope without slipping. With a detailed explanation of your method ...

*Tuesday, November 22, 2016 by Daniel*

**Physics- Equilibrant Force**

Two movers are pushing a large crate with a force of 50.0 N each. One pushes north, the other east. What is the equilibrant force? a. 71 N Southwest b. 50 N Northeast c. 100 N Southeast d. 71 N Northeast

*Monday, November 21, 2016 by MM*

**Physics- Equilibrium**

Which of the following is in equilibrium? a. an object that was thrown straight upward at the moment it has zero velocity (my answer) b. an object moving in a circle at constant speed c. an object that moves at constant velocity d. an object that moves at constant acceleration

*Monday, November 21, 2016 by MM*

**Physics- Accleration of a Falling Penny**

A visitor to the observation deck of a skyscraper manages to drop a penny over the edge. As the penny falls faster, the force due to air resistance increases. How does this affect the acceleration of the penny? a. The acceleration decreases b. The acceleration remains constant...

*Monday, November 21, 2016 by MM*

**Physics**

Is it true that with buoyancy, the weight of the displaced water equals the weight of the complete object, even if only a part of the object is submerged? If so, why, since the weight of a larger object would be greater than that of a smaller one?

*Monday, November 21, 2016 by Anonymous*

**Physics- Baseball thrown upwards, accleration**

When a baseball is thrown straight upward, what is its acceleration at its greatest height? a. 9.8 m/s2 upward b. 9.8 m/s2 downward (my answer?) c. 0 m/s2 d. 9.8 m/s2 horizontally

*Monday, November 21, 2016 by MM*

**Physics- Object Reaches Maximum Height**

When an object that has been thrown into the air reaches its maximum height, which is true? a. its velocity is zero. b. it is at its terminal velocity. c. it is not in free fall. d. its acceleration is zero.

*Monday, November 21, 2016 by MM*

**Physics-Tension Force**

A strong, weightless rope has a 0.15 kg mass hanging from the middle of it. What tension force will make the rope horizontal, corresponding to θ=0°?

*Monday, November 21, 2016 by MM*

**Physics**

A baseball with a 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? a. -7.0 m/s2 b. -2.8 m/s2 c. -9.8 m/s2 d. -12.6 m/s2

*Monday, November 21, 2016 by MM*

**Physics**

Two spherical objects have masses of 3.5 x 10^7 kg and 6.5 x 10^9 kg. Their centers are separated by a distance of 125000 m. Find the gravitational attraction between them.

*Monday, November 21, 2016 by Student*

**Physics**

The temperature of the Sun’s surface (the so-called photosphere) is about 5500 C. Assume that the Sun’s surface is pretty close to a perfect black-body emitter. (a) At what wavelength does the peak intensity of Sun’s radiation lie? (b) Estimate the total power radiated ...

*Monday, November 21, 2016 by Dan*

**physics**

A uniform rigid rod of mass 1kg and length 30cm. Find the moment of inertia of the rod about an axis perpendicular to the rod through on end.

*Monday, November 21, 2016 by Kevin Land*

**Physics**

A 51-kg vampire and 139-kg werewolf clash during the Feat of Strength part of the annual celebration of Festivus. The werewolf velocity just before the clash is 6 m/s and is directed upwards, while the vampire velocity at the moment of the collision is 10m/s and is directed ...

*Monday, November 21, 2016 by Kevin Land*

**Physics**

The electric field between two equally but oppositely charged parallel plates is 2.35 N/C [south]. If a charge of –2.00 C was placed at the midway point between the plates, what force (magnitude and direction) would act on the charge? Give the direction as acting north or ...

*Monday, November 21, 2016 by Humera*

**physics**

(1) a car travelling at a constant speed of 20ms-1 overcomes a constant frictional resistance of 300N. What is the horse power of the engine? ( take 1h.p = 3/4 kw)

*Monday, November 21, 2016 by samuel*

**Physics**

You row a boat perpendicular to the shore of a river that flows at 2.5 m/s. The velocity of your boat is 4.5 m/s relative to the water. (a) What is the velocity of your boat relative to the shore? (b) What is the component of your velocity parallel to the shore? (c) What is ...

*Monday, November 21, 2016 by HELP*

**physics**

suppose the experiment was conducted on the surface of the moon of about 1-6th that of the earth. If a single period takes exactly 1.00 second, how long does a period take on the moon ?

*Monday, November 21, 2016 by Briana*

**Physics**

A car travels at an average speed of 100k-m/hr what distance does it cover in 5min.hint speed=distance/time

*Monday, November 21, 2016 by Kissless*

**Physics**

In a vertical lifting an object with mass of 2kg is lifted 1m above the ground. A work of 80J is done with a constant force. What is the acceleration of the object?

*Monday, November 21, 2016 by Anonymous*

**Physics**

A 0.14 kg baseball is pitched at a speed of 35 m/s. If it is hit straight back at the pitcher with a force of 5400N exerted over a time interval of 1.0 millisecond, find: the distance that the baseball was in contact with the bat (hint, use d = Vave*t) Vave = 1/2(vi + vf) Vave...

*Monday, November 21, 2016 by Louren*

**Physics**

An astronaut lands on a distant planet and places a mathematical pendulum with a length of 50 cm. He measures that the pendulum makes 100 oscillations in 136 sec. What is the gravity acceleration on that planet.

*Monday, November 21, 2016 by Anonymous*