Thursday

November 26, 2015
**Physics **

At t=0 a particle leaves the origin with a velocity of 5.0 m/s in the positive y direction, its acceleration is given by a=3i-2j m/s^2 At the instant the particle reaches its maximum y coordinate, how far is it from the origin? I'm not sure how to do a question like this, ...
*Saturday, October 17, 2015 by alyssa*

**Physics**

A 2.9 kg brick has a kinetic coefficient of friction of 0.33. what force must be applied to the brick for it to move at a constant velocity? Show work
*Saturday, October 17, 2015 by hamza*

**Physics**

Ivan rides his motorcycle 4.5 times around a circular track that has a radius of 100 m a)what is the distance traveled and b)what is the displacement?
*Saturday, October 17, 2015 by Isha*

**physics**

An astronaut was working on the exterior of her spaceship tightening a bolt with her wrench. The astronaut and a spaceship both experience weightlessness and become separated from each other. Suggest a way in which the astronaut can use her knowledge of Newton's Laws to ...
*Saturday, October 17, 2015 by Mike*

**physics**

You are driving on a very long, very straight 2 lane road, stuck behind a lorry which travels at a constant 75 km/hour. You want to overtake the lorry, which has a length of 12.0 m. You car is 3.8 m long. To overtake the lorry, and to do this safely, you need to move to the ...
*Saturday, October 17, 2015 by Physics*

**physics**

You are driving on a very long, very straight 2 lane road, stuck behind a lorry which travels at a constant 75 km/hour. You want to overtake the lorry, which has a length of 12.0 m. You car is 3.8 m long. To overtake the lorry, and to do this safely, you need to move to the ...
*Saturday, October 17, 2015 by Anonymous*

**Physics**

A 72 kg skier leaves the end of a ski-jump ramp with a velocity of 24 m/s directed 25◦ above the horizontal. The skier returns to the ground at a point that is 14 m below the end of the ramp with a total speed of 22 m/s. (a) What is the rate at which the gravitational ...
*Saturday, October 17, 2015 by Adam*

**physics**

An elevator is moving upward with a speed of 11 m/s. Three seconds later, the elevator is still moving upward, but its speed has been reduced to 5.0 m/s. What is the average acceleration of the elevator during the 3.0 s interval? a.5.3 m/s2, upward b.2.0 m/s2, upward c.5.3 m/...
*Saturday, October 17, 2015 by N*

**physics**

a car accelerating from reast at 2m/s2 for 5s?..
*Saturday, October 17, 2015 by ibrahim*

**Physics**

A crate of mass 40 kg is pushed up a ramp by a person as shown in the figure below. The person pushes the crate a distance of 14 m as measured along the ramp. Assume the crate moves at constant velocity. Assume the coefficient of kinetic friction between the crate and the ramp...
*Friday, October 16, 2015 by Noel*

**physics**

A 82.0 kg crate, starting from rest, is pulled across a floor with a constant horizontal force of 314.0 N. The floor is rough with a coefficient of friction of 0.30. What is the final speed of the crate, in m/s, after it has been pulled a distance of 13.0 m?
*Friday, October 16, 2015 by Anonymous*

**PHYSICS**

A sprinkler mounted on the ground sends out a jet of water at a 20 ∘ angle to the horizontal. The water leaves the nozzle at a speed of 11 m/s . How far does the water travel before it hits the ground?
*Friday, October 16, 2015 by Meg*

**physics help**

A block Q Of mass 70 kg is at rest on a table it is connected to block P By means two light inextensible strings knotted at S .A Third string is arranged in such a way that the string connecting block Q is horizontal. Calculate the maximum weight of block P for which block Q ...
*Friday, October 16, 2015 by alex*

**Physics **

A shell is fired from the ground with an initial speed of 1.60 × 103 m/s (approximately five times the speed of sound) at an initial angle of 43.0◦ to the horizontal. The acceleration of gravity is 9.81 m/s2 . a) Neglecting air resistance, find the shell’s ...
*Friday, October 16, 2015 by Anonymous*

**Physics **

A shell is fired from the ground with an initial speed of 1.60 × 103 m/s (approximately five times the speed of sound) at an initial angle of 43.0◦ to the horizontal. The acceleration of gravity is 9.81 m/s2 . a) Neglecting air resistance, find the shell’s ...
*Friday, October 16, 2015 by Jessika *

**physics**

A box containing food supplies for a refugee camp was dropped from a helicopter flying horizontally at a constant elevation of 414.1 m. If the box hit the ground at a distance of 95.3 m horizontally from the point of its release, ... a) what was the speed of the helicopter? b...
*Friday, October 16, 2015 by sandy*

**Physics**

If the rope pulling on the leg exerts a 120-N force on it, how massive should be the block hanging from the rope that passes over the pulley?
*Friday, October 16, 2015 by Joseph*

**physics**

An object is launched at a speed of 24.68 m/s from the top of a tall tower. The height y of the object as a function of the time t elapsed from launch is y(t) = –4.905 t2 + 18.01 t + 60.34, where y is in meters and t is in seconds. Determine: a) the height H of the tower;
*Friday, October 16, 2015 by linda*

**Physics**

Baseball player A bunts the ball by hitting it in such a way that it acquires an initial velocity of 2.0 m/s parallel to the ground. Upon contact with the bat the ball is 1.0 m above the ground. Player B wishes to duplicate this bunt, in so far as he also wants to give the ...
*Friday, October 16, 2015 by Adrian *

**Physics**

A horizontal rifle is fired at a bull's-eye. The muzzle speed of the bullet is 640 m/s. The gun is pointed directly at the center of the bull's-eye, but the bullet strikes the target 0.028 m below the center. What is the horizontal distance between the end of the rifle...
*Friday, October 16, 2015 by Adrian *

**Physics**

A tennis ball is struck and departs from the racket horizontally with a speed of 28.6 m/s. The ball hits the court at a horizontal distance of 18.4 m from the racket. How far above the court is the tennis ball when it leaves the racket?
*Friday, October 16, 2015 by Adrian *

**Physics**

A skier launches off a ski jump with a horizontal velocity of 25.3 m/s (and no vertical velocity component). a) What is the magnitude of the horizontal component of her velocity the instant before she lands 1.95 s later? b) What is the magnitude of the vertical component of ...
*Friday, October 16, 2015 by Mark*

**Physics**

A model airplane has a mass of 0.95 kg and moves at a constant speed on a circle that is parallel to the ground. Assume that there is no upward lift on the plane generated by its wings. Without such lift, the guideline slopes downward due to the weight of the plane. Find the ...
*Friday, October 16, 2015 by James*

**Physics **

A pilot, whose mass is 70.0 kg, makes a loop-the-loop in a fast jet. Assume that the jet maintains a constant speed of 325 m/s and that the radius of the loop-the-loop is 5.922 km. What is the apparent weight that the pilot feels (i.e., the force with which the pilot presses ...
*Friday, October 16, 2015 by Nick*

**physics**

Two identical sources S1 and S2 are moving towards an observer P. The two sound sources S1 and S2 produce notes of frequency 500hz. If the speed of S1 and S2 are 20ms-1 and 23ms-1 respectively, calculate the beat frequency heard by P. (Speed of sound = 340ms-1) I don't ...
*Friday, October 16, 2015 by shu yan*

**PHYSICS**

The height of a tower is 25m. A stone is thrown upwards from the top of the tower at 20.5m/s. Calculate the total time the stone was in the air.
*Friday, October 16, 2015 by MAMBA NP*

**Physics**

Consider the equation v = (1/7)zxt2. The dimensions of the variables v, x, and t are [L/T], [L], and [T] respectively. The numerical factor 7 is dimensionless. What must be the dimensions of the variable z, such that both sides of the equation have the same dimensions?
*Friday, October 16, 2015 by Harry*

**physics**

The drawing shows four point charges. The value of q is 1.4 μC, and the distance d is 0.86 m. Find the total potential at the location P. Assume that the potential of a point charge is zero at infinity
*Friday, October 16, 2015 by Sarah*

**Physics**

A sprinkler mounted on the ground sends out a jet of water at a 30 ∘ angle to the horizontal. The water leaves the nozzle at a speed of 11 m/s . How far does the water travel before it hits the ground?
*Friday, October 16, 2015 by raquel *

**Physics**

When the motor in the figure below raises the m = 1010kg mass, it produces a tension of 1.04E+4N in the cable on the right side of the pulley. The pulley has a moment of inertia of 78.9kgm^2 and a radius of 0.736m. The cable rides over the pulley without slipping. Determine ...
*Friday, October 16, 2015 by Nora*

**physics**

A swimmer wants to cross a river, from point A to point B, as shown in the figure. The distance d1 (from A to C) is 200 m, the distance d2 (from C to B) is 180 m, and the speed of the current in the river is 1.0 m/s. Suppose that the swimmer's velocity relative to the ...
*Thursday, October 15, 2015 by walter*

**Physics**

A 63.7 kg skier encounters a dip in the snow's surface that has a circular cross section with radius of curvature of $r$ = 11.5 m. If the skier's speed at point A in the figure below is 7.87 m/s, what is the normal force exerted by the snow on the skier at point B? ...
*Thursday, October 15, 2015 by Anonymous*

**Physics**

In a glancing collision between two identical steel spheres, which of the following statements are correct? (Assume this collision is perfectly elastic. Select all that apply.) a) The velocities of the spheres after the collision in the direction perpendicular to the incoming ...
*Thursday, October 15, 2015 by David*

**Physics**

A steel ball rolls off a flat table of height 1.05 m with a velocity of 1.90 m/s a) How long will it take the ball after leaving contact with the table to hit the ground? b) How far from the edge of the table will the ball hit the floor?
*Thursday, October 15, 2015 by David*

**physics**

You throw a snowball at an angle of 34.0° below the horizontal from the roof of a building that is 74.0 m above flat ground. The snowball hits the ground a distance of 44.0 m from the base of the building. Assume free fall with up as positive, and use g = 9.80 m/s2. how ...
*Thursday, October 15, 2015 by walter*

**physics**

An object is launched at a speed of 15 m/s. If it rises to a height of 2 m, at what angle was it launched?
*Thursday, October 15, 2015 by walter*

**Physics**

If a rocket is launched at an initial speed of 120m/s at an angle of 25 degrees, find the time of flight, range, and it's highest height.
*Thursday, October 15, 2015 by BN*

**physics**

A 330 kg box rests on an adjustable ramp having s = 0.25. The angle on inclination of the ramp is increased until the box begins to slide. At what angle will the box begin to slide?
*Thursday, October 15, 2015 by Sara*

**PHYSICS URGENT**

While flying at an altitude of 7.25 km, you look out the window at various objects on the ground. If your ability to distinguish two objects is limited only by diffraction, find the smallest separation between two objects on the ground that you can resolve as distinguishable. ...
*Thursday, October 15, 2015 by Kent*

**Physics**

A 21 kg child swings on a playground swings 3.6 m long. What is period of her motion? 2) If her older brother, who weighs twice as much as she does, rides in the swing instead, what is the period of the motion? Assume the center of mass to be at the position of the seat in ...
*Thursday, October 15, 2015 by Vishwajeet*

**Physics**

A 5 g bullet has a speed of 300 m/s and embeds itself into a 500 g block. The block is initially at rest sitting on a rough surface which has a coefficient of kinetic friction equal to 0.5. A) What is the speed of the block after the collision? which is= 2.97 m/s B) What ...
*Thursday, October 15, 2015 by Melissa*

**Physics**

So if I have a rocket going to a certain height - I know its mass, and I know its total impulse, and the height it reaches -how do I calculate for another height? For example, 50Ns is total impulse, mass is 550g, and height is 750m. How do I calculate the impulse needed to ...
*Thursday, October 15, 2015 by Enrique*

**science- physics**

Two spheres are launched horizontally from a 1.1 m -high table. Sphere A is launched with an initial speed of 4.5 m/s . Sphere B is launched with an initial speed of 1.5 m/s . What is the distance that sphere A travels from the edge of the table? What is the distance that ...
*Thursday, October 15, 2015 by Laura*

**Physics**

A wire of length 2.00m and radius 1.0mm is stretched modulus for the wire
*Thursday, October 15, 2015 by Blessing*

**AP Physics**

Two blocks are connected by a string over a frictionless, massless pulley such that one is resting on an inclined plane and the other is hanging over the top edge of the plane. The hanging block has a mass of 16 kg and the one on the plane has a mass of 8 kg. The coefficient ...
*Thursday, October 15, 2015 by Brianna*

**physics**

A motor car of mass 1200kg is moving along a straight line with a uniform velocity of 90km/h.itsmvelocity is slowed down to 18km/h in 4 s by an unbalanced external force.calculate th acceleration and change in momentum of the car . Also calculate the magnitude of force required.
*Thursday, October 15, 2015 by piyush*

**Physics**

What is the power of an engine that pulls a 1000kg automobile at a steady speed of 10m/s along a level road?
*Thursday, October 15, 2015 by Arisha Aijaz Ali.*

**Physics**

A 200 g block is pressed against a spring with a spring constant of 1.4 kN/m until the block compresses the spring by 10 cm. The spring rests at the bottom of a ramp inclined at θ = 60◦ to the horizontal. Determine how far up the incline the block moves (L) before ...
*Thursday, October 15, 2015 by Mauricio*

**AP Physics**

You are standing at the top of a cliff that has a stairstep configuration. There is a vertical drop of 6 m at your feet, then a horizontal shelf of 10 m , then another drop of 4 m to the bottom of the canyon, which has a horizontal floor. You kick a 0.49 kg rock, giving it an ...
*Wednesday, October 14, 2015 by MJay*

**Physics**

You are pulling handle of a wagon with a force of 270N. The handle makes an upward 35 degrees angle with the ground. The loaded wagon has a mass of 95kg. 1.what is the weight of the wagon? 2.How much of your applied force pulls the wagon forward? 3.what is the normal force ...
*Wednesday, October 14, 2015 by Anonymous*

**physics**

A 5 kg box is sitting on a table. Bob's hand is pushing down on the box with a 12 N force. Find the normal force on the box. (draw this)
*Wednesday, October 14, 2015 by Beverly*

**physics**

The force of gravity on a box is 597 N on the surface of the Earth. Find the mass of the box.
*Wednesday, October 14, 2015 by Nicholis*

**physics**

What are differences between nuclear fusion and nuclear fission?
*Wednesday, October 14, 2015 by sujal*

**physics**

What is voltage and electromotive force?
*Wednesday, October 14, 2015 by sujal*

**AP Physics 1**

In the javelin throw at a track-and-field event, the javelin is launched at a speed of 33 m/s at an angle of 32° above the horizontal. As the javelin travels upward, its velocity points above the horizontal at an angle that decreases as time passes. How much time is ...
*Wednesday, October 14, 2015 by Anonymous*

**physics**

Why is voltmeter made of high resistance?
*Wednesday, October 14, 2015 by sujal*

**physics**

Why is voltmeter connected in parallel in electric circuit?
*Wednesday, October 14, 2015 by sujal*

**physics**

Sound wave with greater amplitude travels farther than that with smaller amplitude?
*Wednesday, October 14, 2015 by sujal*

**Physics**

A man exerts an effort of 250 Newtons through a distance of 4 meters to lift a load of 1000 Newtons through a height of 0.75 meters. Calculate the velocity ratio. I'm thinking i divide the 4 meters(displacement of effort)/0.75 meters (displacement of load)
*Wednesday, October 14, 2015 by Cortney*

**Physics**

Gun fires at 400m /sec.What is the range of the gun shen elevated at an angle of 30 degrees.
*Wednesday, October 14, 2015 by Carlene*

**physics**

Suppose that a net force F gives an object with a mass of m an acceleration of 9.65 m/s/s. Suppose that the net force were increased by a factor of 4.7, and the mass were increased by a factor of 3.0. What would be the new acceleration (in m/s/s)? Please help, for I do not ...
*Wednesday, October 14, 2015 by Janice*

**Physics**

Remember the Poynting vector? The magnitude of this vector gives the amount of energy per second that flows through a unit area (in the direction it gives) because of the presence of a combination of electric and magnetic field, like in an electro-magnetic wave. The units for ...
*Wednesday, October 14, 2015 by Ryan*

**Physics**

If there was a way to accelerate a spaceship close to the speed of light to go visit some neighboring star system, one would still face the problem that every particle the spaceship finds on its way will be a projectile hitting it with almost the speed of light, causing ...
*Wednesday, October 14, 2015 by Ryan*

**Physics**

A permanent magnet creates a homogenous magnetic field B~ inside a rectangular region. The magnet is moving with a velocity ~v ⊥ B~ . A particle at rest with mass m and charge Q is on the path of the magnet. Assume that the magnet has a mass much larger than the particle...
*Wednesday, October 14, 2015 by Ryan*

**PHYSICS**

On a banked race track, the smallest circular path on which cars can move has a radius of 114 m, while the largest has a radius of 170 m, as the drawing illustrates. The height of the outer wall is 17.5 m. Find (a) the smallest and (b) the largest speed at which cars can move ...
*Wednesday, October 14, 2015 by Anonymous*

**physics**

6. Calculate the gravitational force between you (weight: 140 lb) and your classmate (125 lb) sitting 20 inches apart on a bench. Answer must be in standard metric units. I dont want the answer can you just explain how to put it together and how do I add G Which is 6.67x10^-11
*Wednesday, October 14, 2015 by Anonymous*

**physics**

Suppose the stone is thrown at an angle of 30.0 degrees below the horizontal. If it strikes the ground 57.0 m away, find (a) the time of flight, (b) the initial speed, and (c) the speed and the angle of the velocity vector with respect to the horizontal at impact. (Hint: ...
*Wednesday, October 14, 2015 by Adam*

**Physics**

On a banked race track, the smallest circular path on which cars can move has a radius of 114 m, while the largest has a radius of 170 m, as the drawing illustrates. The height of the outer wall is 17.5 m. Find (a) the smallest and (b) the largest speed at which cars can move ...
*Wednesday, October 14, 2015 by Anonymous*

**Physics**

A uniform 4m plank with a mass of 45 kg is supported at its ends by two ladders. Two 75 kg men are standing on the plank. One is 1 m from one end and the other is 1.5 m from the other end. Determine the forces exerted by the ladders.
*Wednesday, October 14, 2015 by Maya*

**Physics**

A block of mass m = 5.0 kg is pulled along a rough horizontal surface by a rope as sketched in the figure below. ( rope is at a 30 degree angle from the horizontal) The tension in the rope is 50 N, and the coefficient of kinetic friction between the block and the surface is &#...
*Wednesday, October 14, 2015 by Wrenn*

**physics**

a force of 100.0N act in a direction at an angle of 45 degrees with the x axis. What is the magnitude of the x component of force. I got 70.7 but I think I am wrong can you tell me
*Wednesday, October 14, 2015 by cody *

**PHYSICS**

Car A uses tires for which the coefficient of static friction is 0.399 on a particular unbanked curve. The maximum speed at which the car can negotiate this curve is 10.4 m/s. Car B uses tires for which the coefficient of static friction is 0.831 on the same curve. What is ...
*Wednesday, October 14, 2015 by Anonymous*

**Physics**

Resolve a force of 23 N at 180 degrees and a force of 47 N at 270 degrees.
*Wednesday, October 14, 2015 by Jason*

**Physics**

A 75 kg man sits at one end of a uniform seesaw pivoted at its center, and his 24 kg son at the other end. Where would his 55kg wife have to sit to balance the seesaw?
*Wednesday, October 14, 2015 by Maya*

**PHYSICS**

At an amusement park there is a ride in which cylindrically shaped chambers spin around a central axis. People sit in seats facing the axis, their backs against the outer wall. At one instant the outer wall moves at a speed of 3.78 m/s, and an 63.5-kg person feels a 528-N ...
*Wednesday, October 14, 2015 by Anonymous*

**Physics**

Two particles of mass 5 g and 10 g respectively are joined by a light string which passes through a small hole on a smooth table. The smaller particle describes a circle of radius R on the table at a rate of 4 revolutions per second while the heavier particle hangs at rest ...
*Wednesday, October 14, 2015 by an*

**Physics **

a student performing the centripetal force experiment added some mass to the 25.0g acceleration block. when he did the experiment, he found that the speed at which the accelerated block separate from the magnet was 102 m/s^2. The radius of the circular motion before breakaway ...
*Wednesday, October 14, 2015 by Layla Smith*

**Physics **

a student performing the centripetal force experiment added some mass to the 25.0g acceleration block. when he did the experiment, he found that the speed at which the accelerated block separate from the magnet was 102 m/s^2. The radius of the circular motion before breakaway ...
*Wednesday, October 14, 2015 by parna deljo *

**Physics**

A golf ball strikes a hard, smooth floor at an angle of 20.7 ° and, as the drawing shows, rebounds at the same angle. The mass of the ball is 0.0528 kg, and its speed is 40.2 m/s just before and after striking the floor. What is the magnitude of the impulse applied to the ...
*Wednesday, October 14, 2015 by John*

**Physics**

Two blocks M1 and M2 are connected by a massless string that passes over a massless pulley as shown in the figure. M1 has a mass of 8.25 kg and rests on an incline of 73.5°. M2 rests on an incline of 15.5°. Find the mass of block M2 so that the system is in equilibrium...
*Wednesday, October 14, 2015 by meg*

**PHYSICS**

A skier is gliding along at 2.0 m/s on horizontal, frictionless snow. He suddenly starts down a 10 ∘ incline. His speed at the bottom is 15 m/s . a).What is the length of the incline? b).How long does it take him to reach the bottom? (Please show work)
*Tuesday, October 13, 2015 by Meg*

**Physics**

When it comes to a ballistic pendulum, why would it be justified to say that the momentum in the horizontal direction is conserved over the collision interval? I think it's because of the law of conservation of linear momentum, but I feel like there is more to it than that...
*Tuesday, October 13, 2015 by Stevie*

**physics**

a 2.00 * 10^5 kg lunar landing craft is about to touch down on the surface of the moon
*Tuesday, October 13, 2015 by ali*

**Physics **

A cargo plane is moving with a horizontal velocity of vx = +223 m/s at a height of y = 980 m above level ground as shown in the figure below when it releases a package. Ignoring air resistance, how much time will it take the package to reach the ground? (Express your answer to...
*Tuesday, October 13, 2015 by Mariah*

**Physics **

The Asian Silver Carp is an invasive species of fish which has infested a number of American rivers. The disturbance of passing boats has been known to make these fish leap large distances out of the water. One such fish leaps with an initial velocity at the water's ...
*Tuesday, October 13, 2015 by Mariah*

**Physics **

The place kicker on a football team kicks a ball from ground level with an initial speed of 22.40 m/s at an angle of 15.0° above the horizontal. How far does the ball travel in the x-direction before it lands on the ground again? You may neglect air resistance.
*Tuesday, October 13, 2015 by Mariah*

**physics**

While John is traveling along a straight interstate highway, he notices that the mile marker reads 256 km. John travels until he reaches the 144 km marker and then retraces his path to the 173 km marker. What is John’s resultant displacement from the 256 km marker? How ...
*Tuesday, October 13, 2015 by eric*

**Revolution and frequency i need help physics**

A spring makes 60 revolution in 15mins calculate the period and the frequency of the revolution??
*Tuesday, October 13, 2015 by Collins*

**physics**

A person pushes a 16.5-kg shopping cart at a constant velocity for a distance of 36.6 m on a flat horizontal surface. She pushes in a direction 27.9 ° below the horizontal. A 48.1-N frictional force opposes the motion of the cart. (a) What is the magnitude of the force ...
*Tuesday, October 13, 2015 by Kim*

**physics**

A pendulum bob of mass 100g is pulled to a vertical height of 5m from the horizontal and released.calculate th maximum potiential energy. 2.The maximum speed of the bob
*Tuesday, October 13, 2015 by kayumba*

**physics**

a stone is dropped from the top of a cliff. it is seen to hit the ground 3.5 seconds later. how high is the cliff
*Tuesday, October 13, 2015 by Anonymous*

**physics**

The ball is in the pool (point A) to the edge of which is an observer (point B). A minimum distance ball from the edge of the pool is 36 m (point C), and an observer to that point has to walk along the edge of 42 m. a) If the speed of walking along the edge of the pool of 1.5 ...
*Tuesday, October 13, 2015 by ruza*

**physics**

A softball having a mass of 0.25 kg is pitched at 95 km/h. By the time it reaches the plate it may have slowed 10%. neglecting gravity, estimate the average force of air resistance during a pitch. if the distance between the plate and the pitcher is about 15 m.
*Tuesday, October 13, 2015 by joyce*

**Physics**

A car is traveling around a horizontal circular track with radius r = 270 m as shown. It takes the car t = 66 s to go around the track once. The angle θA = 19° above the x axis, and the angle θB = 56° below the x axis. 1What is the magnitude of the car’s...
*Tuesday, October 13, 2015 by Harman Preet*

**physics**

If 200 cm3 of tea at 95°C is poured into a 150-g glass cup initially at 25°C, what will be the common final temperature T of the tea and cup when equilibrium is reached, assuming no heat flows to the surroundings
*Tuesday, October 13, 2015 by jay*

**Physics**

A baseball is hit off the edge of a cliff horizontally at a speed of 30 m/s. It takes the ball 3 seconds to reach the ground, with no air resistance. How high is the cliff wall?
*Monday, October 12, 2015 by Francesca*

**physics**

if you use a horizontal force of 30 N to slide a 12 kg wooden crate across a floor at a constant velocity, what is the coefficient of kinetic friction between the crate and the floor?
*Monday, October 12, 2015 by carly*

**physics**

A 25-kg bullet traveling shoots into a physics textbook that is 3.5 cm wide, and exits the textbook traveling 40 m/s. Poor defenseless textbook! (A) What was the magnitude of the average deceleration of the bullet while it was penetrating through the textbook? (B) What was the...
*Monday, October 12, 2015 by Tiara*

**urgent physics help**

when the full moon directly overhead the angle from one edge of the moon to the other is measured to be 0.6970 if the diameter of the moon is 3650 km how far is it from the moon
*Monday, October 12, 2015 by Anonyomous *

**Physics**

An Object of mass 7 kg is pushed along a surface up to a velocity of + 10 m/s before it is let go. It then slows to a stop due to an 11-N frictional force. How long until it comes to a stop?
*Monday, October 12, 2015 by Erin*