Tuesday

September 16, 2014

September 16, 2014

**Recent Homework Questions About Physics**

Post a New Question | Current Questions

**Physics**

What is the value of each of the angles of a triangle whose sides are 95, 150, 190 cm in length? I have tried to do this problem, don't get me wrong, but I don't really know where to go. Can someone tell me how to even approach this problem? The textbook states that ...
*Sunday, July 6, 2014 at 1:20am*

**physics**

rex stands 3m away from a concave mirror.his hieght is 1.70m. If the image formed on the screen is 12cm from the mirror,what is the size of the image
*Saturday, July 5, 2014 at 9:02pm*

**physics**

An object with mass 110 kg moved in outer space. When it was at location < 11, -35, -7 > its speed was 17.5 m/s. A single constant force < 230, 420, -230 > N acted on the object while the object moved to location < 16, -41, -13 > m. What is the speed of the ...
*Saturday, July 5, 2014 at 3:00pm*

**PHYSICS**

a car is proceeding at a speed of 14.0m/s when it collides with a stationary car in front. during the collision the first car moves a distance of 0.300 m as it comes to a stop. the driver is wearing her seat belt, so she remains in her seat during the collision. if the drivers...
*Saturday, July 5, 2014 at 12:35pm*

**physics**

A worker in a warehouse uses a rope passing through some pulleys to lift a heavy crate. The worker exerts a force five times less than the weight of the crate but has to move the rope four times as far as the crate moves. This situation... A) can happen because the extra ...
*Saturday, July 5, 2014 at 12:30pm*

**PHYSICS**

a 2.00kg object A is connected with a massless string across a massless, frictionless pulley to a 3.00kg object B. the smaller object rests on an inclined plane which is tilted at an angle of theta=40degrees. what are the acceleration of the system and the tension in the string?
*Saturday, July 5, 2014 at 11:48am*

**PHYSICS**

a locomotive pulls 10 identical freight cars. the force between the locomotive and the first car is 100,000 Newtons, and the acceleration of the train is 2m/s^2. there is no friction to consider.what is the force between the ninth and tenth cars?
*Saturday, July 5, 2014 at 11:44am*

**PHYSICS**

a locomotive pulls 10 identical freight cars with an acceleration of 2m/s^2. How does the forced between the third and fourth cars compare to the force between the seventh and eighth cars?
*Saturday, July 5, 2014 at 11:41am*

**physics**

two forces F1 and F2 acting at a point have a resultant F. If F2 is doubled, F is also doubled. If F2 is reversed in direction, then also F is doubled, then options A. F1:F=1:1 B. F2:F=root3:root2 C. F1:F2=root2:root3 D. F1:F2:F=root2:root3:root2
*Saturday, July 5, 2014 at 10:24am*

**physics**

Two forces of magnitude 20 newtons and 25 newtons respectively act at a point. If the resultant force is 39 newtons, the angle between the forces has to be nearly?
*Saturday, July 5, 2014 at 10:03am*

**physics**

the vectors sum of two vectors of magnitudes 10 units and 15 units can never be?
*Saturday, July 5, 2014 at 9:22am*

**PHYSICS**

T.E of e in excited state is E . WHAT IS KINETIC ENERGY with proper sign
*Saturday, July 5, 2014 at 5:58am*

**physics**

An elevator is travelling upwards at 15m/s2 and the hoisting cable is cut when it is 40 m from the ground. Determine the maximum height reached by the elevator & the velocity just before it hits the ground.
*Saturday, July 5, 2014 at 3:54am*

**Physics **

Four rocks are thrown horizontally from a building, with varying speeds and from various floors. Rock 1 lands a distance r away from the building, rock 2 lands 2r away from the building, rock 3 lands at distance 3r, and rock 4 at 4r. Ignore air resistance. Drag the rocks into ...
*Saturday, July 5, 2014 at 12:15am*

**Physics- check answer please**

1. A 15 kg boy falls out of his bed at a height of 0.50 m. What is the amount of gravitational potential energy lost by the boy? my answer: 74 J 2. What is the speed of a 0.25 kg ball if its kinetic energy is 15 J? my answer: 11 m/s 3. if the speed of an object is tripled and ...
*Friday, July 4, 2014 at 9:00pm*

**Physics**

a child throws a ball in a net where it gets stuck. Does the motion of this ball defy the law of conservation of momentum? explain
*Friday, July 4, 2014 at 5:32pm*

**physics word problem**

A 60.0 kg girl stands up on a stationary floating raft and decides to go into shore. She dives off the 180 kg floating raft with a velocity of 4.0 m/s [W]. Ignore the substantial friction real objects in water experience. What is the speed of the raft just after the girl dives?
*Friday, July 4, 2014 at 5:29pm*

**Physics**

A dog sits on the left end of a boat of length L that is initially adjacent to a dock to its right. The dog then runs toward the dock, but stops at the end of the boat. If the boat is H times heavier than the dog, how close does the dog get to the dock? Ignore any drag force ...
*Friday, July 4, 2014 at 2:59pm*

**physics**

Two cars are approaching a perpendicular intersection without a stop sign. Car 1 has a mass 900 kg and is heading north and car 2 has mass 900 kg and is heading west. The two cars collide at the intersection, and stick together as a result of the collision. The police report ...
*Friday, July 4, 2014 at 2:58pm*

**physics**

A firecracker explodes, sending pieces of equal mass in three directions as shown in the diagram. Angle θ is 14 degrees, and angle ϕ is 30 degrees. Assume that the firecracker is initially at rest, and take upward and rightward as the positive directions. What are ...
*Friday, July 4, 2014 at 2:57pm*

**Physics**

Two NBA players are revered for their ability to dunk a basketball, i.e., both players can jump very high. The first player is a tall, heavy center, and the second player is an average height, slim guard. The first player is 1.5 times the mass of the second player, and the ...
*Friday, July 4, 2014 at 2:57pm*

**Physics**

Two skaters, Alan and Betsy, move toward each other on a very smooth skating rink. Their masses and speeds are respectively: 60 kg; 4.0 m/s and 50 kg; 0.4 m/s. After the skaters collide and use their hands to push each other away, Alan is moving backwards at 2.0 m/s. Taking ...
*Friday, July 4, 2014 at 2:56pm*

**Physics (Classical Mechanics)**

Mr. X drops A ball from a height of 1 metre above the ground. Mr. Y starts a camera which takes picture of the ball every 250 ms, with the first click occuring at the moment Mr. X lets go of the ball. Let the ball's height about the groundat the n-th click, in metres, be ...
*Friday, July 4, 2014 at 8:23am*

**physics**

The vectors sum of two vectors of magnitude 10units and 15units can never be
*Friday, July 4, 2014 at 6:31am*

**physics**

Which of the following sets of forces acting simultaneously on a particle keep it in equilibrium?
*Friday, July 4, 2014 at 6:28am*

**physics**

The magnitude of two vectors p and q differ by 1. The magnitude of their resultant makes an angle of tan inverse ( 3 / 4 ) with p. The angle between p and q is
*Friday, July 4, 2014 at 6:26am*

**physics**

The greatest and least resultant of two forces acting at a point are 16N and 4N. If they are acting at an angle 120 degrees with one another their resultant is A. root 38N , B.root 76N, C.root 19N, D.none
*Friday, July 4, 2014 at 6:23am*

**physics**

Two electrons are placed; one at north pole and other at south pole of earth. Find the force between them. Given diameter of earth= 12800 km.
*Friday, July 4, 2014 at 4:23am*

**physics**

A ship is moving West at a velocity of 30 mph and a person is on deck walking EAST at a velocity of 5 mph. To the observer on shore, what is the relative speed of the person walking on the ship’s deck?
*Thursday, July 3, 2014 at 9:13pm*

**physics**

How would I answer number 3? 1. A sumo wrestler originally jumps 10 cm above a trampoline but has the same total energy of a small ball that was 200 cm higher than the trampoline. What causes this equivalency? 2. If a 40 kg gymnast and a 400 kg sumo wrestler each dropped from ...
*Thursday, July 3, 2014 at 8:07pm*

**Physics**

A sumo wrestler originally jumps 10 cm above a trampoline but has the same total energy of a small ball that was 200 cm higher than the trampoline. What causes this equivalency?
*Thursday, July 3, 2014 at 7:02pm*

**Physics -- check answers please**

Use g=10 N/kg in this assignment. 1. What is the gravitational energy (relative to the unstretched surface of the trampoline) of the 20 kg ball at its apex 2 m above the trampoline? I got 400 J 2. What is the kinetic energy of the ball just before impacting the trampoline? I ...
*Thursday, July 3, 2014 at 5:56pm*

**Physics**

fill in the blank ( Energy and momentum unit) 1. the work done to stretch a spring is not equal to the to force multiplied by displacement because force is ____ as the spring stretches 2. A child goes down a slide at the playground, gaining speed as she goes. Her momentum ____...
*Thursday, July 3, 2014 at 2:06pm*

**PHYSICS**

a girl weighing 620 n sits in the middle of a 2.8 m long hammock which sags 1.2m below th e point of support. What force is exerted by each of the two ropes supporting the hammock
*Thursday, July 3, 2014 at 1:38pm*

**Physics (A man in the lift)**

A man of mass m is standing in an elevator. The elevator is accelerating downward at g/k, where k>1 and g is the gravitation acceleration. If the force on the man by the elevator's floof jmg, where j is a constant and k= a/(b+cj), where gcd(|a|,|b|,|c|)=1, what is a+b+c...
*Thursday, July 3, 2014 at 12:56pm*

**Astro-Physics(Binary Star System)**

In a binary star system in which 2 stars orbit each other about their centre of mass, the mass of one star is 20m while the other star is m. In another binary star system, the masses of the star are 14m and m. The fixed distance between the stars in the both cases are the same...
*Thursday, July 3, 2014 at 12:45pm*

**Physics**

Mr. X drops A ball from a height of 1 metre above the ground. Mr. Y starts a camera which takes picture of the ball every 250 ms, with the first click occuring at the moment Mr. X lets go of the ball. Let the ball's height about the ground at the n-th click, in metres, be ...
*Thursday, July 3, 2014 at 12:17pm*

**physics**

A trunk of mass 15 kg is on the floor. The trunk has a very small initial speed. The acceleration of gravity is 9.8 m/s2 . What constant horizontal force pushing the trunk is required to give it a velocity of 10 m/s in 20 s if the coefficient of sliding friction between the ...
*Wednesday, July 2, 2014 at 10:42pm*

**Physics**

The acceleration due to gravity on the moon is about one-sixth its value on earth. If a baseball reaches a height of 64 m when thrown upward by someone on the earth, what height would it reach when thrown in the same way on the surface of the moon? Answer in units of m Can you...
*Wednesday, July 2, 2014 at 10:26pm*

**Physics**

A flowerpot falls from a window sill 37.7 m above the sidewalk. What is the velocity of the flowerpot when it strikes the ground? The acceleration of gravity is 9.81 m/s2 . Can you tell me the steps and why?
*Wednesday, July 2, 2014 at 10:20pm*

**Math**

he physics department of a college has 9 male professors, 8 female professors, 10 male teaching assistants, and 13 female teaching assistants. If a person is selected at random from the group, find the probability that the selected person is a teaching assistant or a female
*Wednesday, July 2, 2014 at 9:42pm*

**Physics**

A net force of 44N accelerates a 5.4-kg mass over a distance of 13 m. a. What is the increase in kinetic energy of the mass?
*Wednesday, July 2, 2014 at 7:27pm*

**Physics**

A rope applies a horizontal force of 208 N to pull a crate a distance of 1.91 m across the floor. A frictional force of 154 N opposes this motion. (a) What is the work done by the force applied by the rope? (b) What is the work done by the frictional force? What is the total ...
*Wednesday, July 2, 2014 at 7:16pm*

**physics**

A load W=2 kN is applied vertically to joint C of truss ABCDE as indicated. You will use the method of joints to obtain the axial forces in the bars and reactions at the supports A, E . E4_1? All the bars in truss ABC have constant cross section and are made of a homogeneous ...
*Wednesday, July 2, 2014 at 5:46pm*

**Physics**

The Leyden jar, invented by chance in 1746, was one of the earliest types of capacitors (see the figure below), made by covering the inner and outer surfaces of a glass jar with conducting layers (for example, aluminum foil). It is a good approximation to treat the Leyden jar ...
*Wednesday, July 2, 2014 at 5:06pm*

**Physics**

A 42.0 kg swimmer with an initial speed of 1.50 m/s decides to coast until she comes to rest. If she slows with constant acceleration and stops after coasting 2.00 m, what was the magnitude of the force exerted on her by the water?
*Wednesday, July 2, 2014 at 5:02pm*

**Physics**

Consider a torque ⃗τ that is constant in both magnitude and direction, and acts on a rigid body of mass 10 kg at a point 1 m from the pivot. How much work does the torque do on the rigid body, if it turns through an angle of 180◦ while the torque is acting? ...
*Wednesday, July 2, 2014 at 4:22pm*

**Physics**

Given: A flat dance floor of dimensions lx = 24 m by ly =23m and has a mass of M = 1200 kg. Use the bottom left corner of the dance floor as the origin. Three dance couples, each of mass m = 110 kg start in the top left, top right, and bottom left corners. What is the initial ...
*Wednesday, July 2, 2014 at 4:08pm*

**Physics**

Given: A flat dance floor of dimensions lx = 24 m by ly =23m and has a mass of M = 1200 kg. Use the bottom left corner of the dance floor as the origin. Three dance couples, each of mass m = 110 kg start in the top left, top right, and bottom left corners. What is the initial ...
*Wednesday, July 2, 2014 at 2:31pm*

**Physics**

A horizontal disk with a radius of 23 m ro- tates about a vertical axis through its center. The disk starts from rest and has a constant angular acceleration of 5.5 rad/s2. At what time will the radial and tangen- tial components of the linear acceleration of a point on the ...
*Wednesday, July 2, 2014 at 2:27pm*

**Physics**

Consider a torque ⃗τ that is constant in both magnitude and direction, and acts on a rigid body of mass 10 kg at a point 1 m from the pivot. How much work does the torque do on the rigid body, if it turns through an angle of 180◦ while the torque is acting? ...
*Wednesday, July 2, 2014 at 2:10pm*

**physics**

A golfer, standing on a fairway, hits a shot to a green that is elevated 5.80 m above the point where she is standing. If the ball leaves her club with a velocity of 46.3 m/s at an angle of 36.0° above the ground, find the time that the ball is in the air before it hits ...
*Wednesday, July 2, 2014 at 1:34pm*

**Physics**

Two point charges q1 = +5.6 10-8 C and q2 = -5.7 10-8 C. |-----q2 | | | q1----A----------B from the q2 to A is 10cm from the q1 to A is 5cm from A to B is 10 cm (a) Find the potential at A. (b) Find the potential at B. (c) Find the potential difference.
*Wednesday, July 2, 2014 at 12:27pm*

**physics**

Find the total displacement of a body in 8seconds starting from rest with an acceleration of 2cm/sec2
*Wednesday, July 2, 2014 at 12:05pm*

**Physics**

In 1910 Rutherford performed a classic experiment in which he directed a beam of alpha particles at a thin gold foil. He unexpectedly observed a few of the particles scattered almost directly backward. This result was not consistent with then current models of atomic ...
*Wednesday, July 2, 2014 at 11:45am*

**Physics- check answer please**

I am supposed to fill in the blanks without a word bank. 1. I you push a crate with 40 N of force at an angle of 30 degrees and your friend pushes with a force of 40 N horizontally, the amount of work you are doing is _____ the amount of work your friend is doing on the crate ...
*Wednesday, July 2, 2014 at 11:39am*

**Physics**

1. How is average speed related to instantaneous speed? What certain conditions must be met for the two variables to have the same or close value? 2. Cite one practical example on the use of the concepts of instantaneous speed, average speed in observing safety on the road.
*Wednesday, July 2, 2014 at 5:33am*

**Physics**

An astronaut of mass m in a spacecraft experiences a gravitational force F=mg when stationary on the launchpad. What is the gravitational force on the astronaut when the spacecraft is launched vertically upwards with an acceleration of 0.2g? A 1.2mg B mg C 0.8mg D 0 Ans= B ...
*Tuesday, July 1, 2014 at 11:20pm*

**PHYSICS**

Two lifeguards pull on ropes attached to a raft. If they pull in the same direction, the raft experiences a net external force of 332 N to the right. If they pull in opposite directions, the raft experiences a net external force of 122 N to the left. Draw a free body ...
*Tuesday, July 1, 2014 at 9:50pm*

**physics 1**

You are driving your car, and the traffic light ahead turns red. You apply the brakes for 2.13 s, and the velocity of the car decreases to +4.90 m/s. The car's deceleration has a magnitude of 3.55 m/s2 during this time. What is the car's displacement?
*Tuesday, July 1, 2014 at 9:45pm*

**physics**

A particle (m=3*10^-6 g, q=5*10^-6 C) moves in a uniform magnetic field given by (60j) mT. At t=0 the velocity of the particle is equal to (30j - 40k)m/s. The subsequent path of the particle is? I know that the answer is: helical with a 40-cm radius. But i dont know the ...
*Tuesday, July 1, 2014 at 3:29pm*

**Physics**

Which of the following is an inertial frame of reference? a) a child on a moving swing observes the child next to them moving in sync b) a child on a moving swing observes a ball that they throw to their parents standing on the ground c) a child observes the motion of the ...
*Tuesday, July 1, 2014 at 2:56pm*

**college physics**

A block of mass 21.5 kg supported by a vertical massless cable is initially at rest. The block is then pulled upward with a constant acceleration of 3.79 m/s2. what is the tension in the cable? what is the magnitude of the net force acting on the mass? what is the speed of the...
*Tuesday, July 1, 2014 at 12:28pm*

**physics**

1. what happens to the force required for an object to maintain circular motion if the period is halved (goes twice as fast around the circle)? a) force doubles b) force quadruples c) force is halved d) force is quartered 2. In a pulley problem involving an inclined plane: a) ...
*Tuesday, July 1, 2014 at 12:17pm*

**physics**

A car moves with a speed of 30km/hr for half an hr,25km/hr for 1he and 40km/hr for 2hrs. What is the average speed of car?
*Tuesday, July 1, 2014 at 5:30am*

**physics**

what force parallel to an inclined plane of height 3 meter and base 4 meter can just support a block mass 500 gram on the plane ? the coefficient of friction 0.25
*Tuesday, July 1, 2014 at 2:33am*

**Physics**

You take a 10 N block and lift it 1 meter vertically from the floor and then place it back down on the floor. How much work do you do during this motion? W = F x d x cos(theta) So lifting it does work and the lowering it does negative work won't that cancel out to get OJ ...
*Tuesday, July 1, 2014 at 2:13am*

**PHYSICS**

HOW CAN YOU TELL WETHER 2 CHARGES HAVE THE SAME MAGNITUDE
*Tuesday, July 1, 2014 at 1:11am*

**Physics**

The velocity acquired by a body moving with uniform acceleration is 12m/s in 2 seconds and 18m/s in 4 seconds.Find the initial velocity of the body.
*Tuesday, July 1, 2014 at 12:02am*

**college physics**

A block of mass 21.5 kg supported by a vertical massless cable is initially at rest. The block is then pulled upward with a constant acceleration of 3.79 m/s2. what is the tension in the cable? what is the magnitude of the net force acting on the mass? what is the speed of the...
*Monday, June 30, 2014 at 11:43pm*

**Physics**

A 20 kg box approaches the foot of a 30 degree inclined plane with a speed of 10 m/s. the coefficient of friction between the box and the inclined plane is 0.2. (a) How far up the inclined plane will the box go? (b) If the box slides back down the inclined plane, what is its ...
*Monday, June 30, 2014 at 9:27pm*

**physics**

A girl inside a room is looking at the window and sees a volleyball passing outside the window of width w and height d. The ball appears from the upper left corner A of the window and disappears at the lower right corner B in t0 second. The girl knows that the ball has been ...
*Monday, June 30, 2014 at 8:11pm*

**Physics**

Four point charges are at the corners of a square of side a as shown in the figure below. Determine the magnitude and direction of the resultant electric force on q, with ke, q, and a left in symbolic form. (Let B = 2.5q and C = 8q. Let the +x-axis be pointing to the right.) ...
*Monday, June 30, 2014 at 3:00pm*

**physics**

a bullet travelling horizontally at a speed of 350 m/s hits a board perpendicular to the surface, passes through it and emerges on the other side at a speed of 210 m/s . if the board is 4.00 cm thick, how long does the bullet takes to pass through it ?
*Monday, June 30, 2014 at 10:36am*

**physics**

pilots can survive radial acceleration up to 9g(88m/s^2). can a fighter pilot flying at a constant speed of 500m/s and in a circle that has a diameter of 8800 m survive to tell about his experience?
*Monday, June 30, 2014 at 8:37am*

**physics, science**

What effect does friction have upon a) ball bounce angle, and b) ‘speed’ of the court? Refer to clay and grass courts to help illustrate your answer. (4 marks) please help!
*Monday, June 30, 2014 at 6:52am*

**physics**

A car traveling at2.24m/s skids and stops in 2.55s determine the skidding distance of car
*Monday, June 30, 2014 at 2:28am*

**physics**

A missile is fired from a launcher with an initial velocity of 250 m/s at a target located 500 m above the launcher and at a horizontal distance of 3000 m. Determine the following: i) The possible firing angles required to hit the target. ii) The maximum height reached for all...
*Sunday, June 29, 2014 at 8:43pm*

**Physics**

(a) Calculate the linear acceleration of a car, the 0.280 m radius tires of which have an angular acceleration of 15.0 rad/s2. Assume no slippage. (m/s2) (b) How many revolutions do the tires make in 2.50 s if they start from rest? (rev) (c) What is their final angular ...
*Sunday, June 29, 2014 at 8:06pm*

**Physics**

You and a friend are playing a game of squirt-gun tag in a maze. Suddenly you see your friend's image in a small planar mirror (see illustration). You take a shot over the barrier in front of you and find that your friend is just at the end of the 7.0 m range of your ...
*Sunday, June 29, 2014 at 5:05pm*

**Physics**

A large store escalator that is designed to transfer customers to one floor to another, a vertical distance of 8.0m. It takes each person 20 seconds to ride from bottom to top of the escalator. Explain how you would determine the power of the escalator motor.
*Sunday, June 29, 2014 at 1:06am*

**physics**

The velocity of a ball changes from ‹ 8, −5, 0 › m/s to ‹ 7.88, −5.28, 0 › m/s in 0.04 s, due to the gravitational attraction of the Earth and to air resistance. The mass of the ball is 140 grams. I calculated the acceleration and got <-3,-7,...
*Saturday, June 28, 2014 at 6:14pm*

**physics**

1. the applied force on a stationary object is less than the maximum force of static friction. Which of the statements are false a) the object will move backwards b) the actual force of static friction will be equal to the applied force c) the object will remain stationary ...
*Saturday, June 28, 2014 at 5:20pm*

**physics**

A 6 kg box with initial speed 5 m/s slides across the floor and comes to a stop after 1.4 s. a.What is the magnitude of the average net force on the box? b.You put a 3 kg block in the box, so the total mass is now 9 kg, and you launch this heavier box with an initial speed of ...
*Saturday, June 28, 2014 at 5:12pm*

**Physics**

In projectile motion, how would you find the final velocity of the object just before it hits the ground a) find the second vertical velocity b) add the final and horizontal velocities directly c)add the final and horizontal velocities as vectors d) add the final and ...
*Saturday, June 28, 2014 at 4:24pm*

**physics**

A referee tosses a coin straight up with a velocity of 5.25 m/s, how high does it go above its point of release? (Hint: How fast is it moving at the maximum height?)
*Saturday, June 28, 2014 at 3:34pm*

**Physics**

Is there normal contact force on a frictionless surface?
*Saturday, June 28, 2014 at 12:32pm*

**physics**

a stone is thrown straight up from a 50m high building and hits the ground at a speed of 37.1m/s. What is the initial velocity and what is the maximum height above the ground that the stone reaches?
*Saturday, June 28, 2014 at 11:27am*

**physics**

a car is driven off the edge of that is 54.0 m high. the point of impact is 130m from the base of the cliff. how fast was the car traveling in (miles/hr) when it went over the cliff?
*Saturday, June 28, 2014 at 9:41am*

**physics**

with an initial speed of 260km/h a train takes 1.50 x 10^3 m to stop on a level track. assuming the 'deceleration' is constant. what is the time in seconds taken for stopping?
*Saturday, June 28, 2014 at 9:38am*

**physics**

what was the initial velocity of a race car traveling down a long straight track if it accelerates at 5.79m/s^2 and ends up going 163km/h in a time of 3.60 seconds?
*Saturday, June 28, 2014 at 9:35am*

**Physics**

What happens when we bring a mercury barometer to the moon?
*Saturday, June 28, 2014 at 9:26am*

**Physics**

A person with a mass of 55kg climbs a tower with a height of 11m in 25 minutes. What power is produced?
*Friday, June 27, 2014 at 11:53pm*

**Physics**

A car is traveling at 11.0 m/s, and the driver sees a traffic light turn red. After .59 s (the reaction time), the driver applies the brakes, and the car decelerates at 8 m/s^2. What is the stopping distance of the car, as measured from the point where the driver first sees ...
*Friday, June 27, 2014 at 10:56pm*

**physics**

An object with a mass of 50.0 g displaces 230.0 ml of water when it is completely immersed. What is the buoyant force on the mass? (Use g = 9.8 N/kg as necessary.)
*Friday, June 27, 2014 at 10:12pm*

**Physics**

A 2.73 kg particle has a velocity of vx = 6.02 m/s and vy = 0.316 m/s. Find the magnitude of its total momentum. Answer in units of kg · m/s
*Friday, June 27, 2014 at 5:06pm*

**Physics**

A bicycle is turned upside down while its owner repairs a flat tire. A friend spins the other wheel and observes that drops of water fly off tangentially. She measures the heights reached by drops moving vertically. A drop that breaks loose from the tire on one turn rises ...
*Friday, June 27, 2014 at 2:20pm*

**physics**

Given: vector a+b+c= 0. Out of the three vectors a,b and c two are equal in magnitude. The magnitude of the third vector is √2 times that of either of the two having equal magnitude. The angles between the vectors are:
*Friday, June 27, 2014 at 1:59pm*

**physics**

A car is moving on a straight road due north with a uniform speed of 50km h^-1 when it turns left through 90°. It the speed remains unchanged after turning, the change in the velocity of the car in the turning process is :
*Friday, June 27, 2014 at 1:54pm*

**physics**

A soccer ball travelling at 15 m/s [E] bounces off of a goal post and ends up moving 12 m/s [S 30¡Æ E]. If the ball was in contact with the post for 0.10 seconds, calculate the acceleration of the ball.
*Friday, June 27, 2014 at 1:44pm*

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