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October 1, 2014

Homework Help: Science: Physics

Recent Homework Questions About Physics

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Physics
Suppose that a disk rotates through two revolutions in 5.5 seconds. (a) What is its displacement in radians in this time? (b) What is its average rotational velocity in rad/s?
Monday, July 7, 2014 at 4:10pm

Physics
Consider two cases in which the same ball is thrown against a wall with the same initial velocity. In case A, the ball sticks to the wall and does not bounce.In Case B, the ball bounces back with the same speed that it came with. a.) In which of the two cases is the change in ...
Monday, July 7, 2014 at 4:02pm

physics
Two parallel wires both carry currents directed from left to right .A circular wire loop lies in the plane of the two wires, mid-way between them.As always, assume the currents are positive charges. Sketch the changes in magnetic fields induced and the resultant current ...
Monday, July 7, 2014 at 3:05pm

Physics
Consider two cases in which the same ball is thrown against a wall with the same initial velocity. In case A, the ball sticks to the wall and does not bounce.In Case B, the ball bounces back with the same speed that it came with. a.) In which of the two cases is the change in ...
Monday, July 7, 2014 at 3:05pm

Physics
Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is the kinetic energy of ...
Monday, July 7, 2014 at 3:03pm

Physics
Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is the kinetic energy of ...
Monday, July 7, 2014 at 3:02pm

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?
Monday, July 7, 2014 at 7:29am

Physics
Consider two cases in which the same ball is thrown against a wall with the same initial velocity. In case A, the ball sticks to the wall and does not bounce.In Case B, the ball bounces back with the same speed that it came with. A.)In which of the two cases is the change in ...
Monday, July 7, 2014 at 4:09am

Physics
Four railroad cars, all with the same mass of 11300 kg, sit on a track, as shown in the figure below. A fifth car of identical mass approaches them with a velocity of 19.3 m/s (to the right). This car collides and couples with the other cars. (a) What is the kinetic energy of ...
Monday, July 7, 2014 at 4:06am

Physics
A railroad car with a mass of 12400 kg collides and couples with a second car of mass 18700 kg that is initially at rest. The first car is moving with a speed of 7.7 m/s prior to the collision. (a) What is the initial momentum of the first car? (b) If external forces can be ...
Monday, July 7, 2014 at 4:04am

Physics
Two charge 10C and 5C but no radius. How can I determine Force?
Monday, July 7, 2014 at 3:05am

college physics 2
steel train rails are placed end to end with space in between on a day where a temperature is 30 degrees. How much stress will be build if the temperature is increase to 150 degrees .assume that the original is 1.5m
Monday, July 7, 2014 at 2:12am

Physics
A rifle with a mass of 1.84 kg fires a bullet with a mass of 4.5 g (0.0045 kg). The bullet moves with a muzzle velocity of 413 m/s after the rifle is fired. (a) What is the momentum of the bullet after the rifle is fired? (b) If external forces acting on the rifle can be ...
Monday, July 7, 2014 at 12:22am

Physics
A 60-kg front seat passenger is moving in a car initially with a speed of 18.4 m/s is brought to rest by an airbag in 0.6 sec. (a) What is the impulse acting on the passenger? (b) What is the average force acting on the passenger in this process?
Monday, July 7, 2014 at 12:22am

Physics
A force of 36.7 N acts on a ball for 0.3 sec. If the ball is initailly at rest (a) What is the impulse on the ball? (b) What is the final momentum of the ball?
Monday, July 7, 2014 at 12:22am

Physics
A bowling ball has a mass of 7 kg and a speed of 1.73 m/s. A baseball has a mass of 0.12 kg and a speed of 25.1 m/s. Which ball has the larger momentum? a. The bowling ball. b. More information needed c. The baseball. d. Both have the same momentum
Monday, July 7, 2014 at 12:22am

Physics
An average force of 208 N acts for a time interval of 0.058 s on a golf ball. (a) What is the magnitude of the impulse acting on the golf ball? (b) What is the change in the golf ball's momentum?
Monday, July 7, 2014 at 12:22am

Physics
A 24.0-V battery is connected to a 4.70-µF capacitor. How much energy (in J) is stored in the capacitor? I'm guessing this is really easy but my professor sent us into the homework blind...again...
Sunday, July 6, 2014 at 9:54pm

physics
an object displace 6 meters toward the east and 8 meters toward the north find its resultant displacement in graphical
Sunday, July 6, 2014 at 9:40pm

physics
how does the gas stove emit light?
Sunday, July 6, 2014 at 3:39pm

physics
Karen and Bill are rearranging furniture in their house, but they don’t always agree on where all the items should go. At one instant, Karen pushes a large chest of drawers (mass of 20kg) horizontally to the right with a force of 35N, while Bill pushes horizontally to the...
Sunday, July 6, 2014 at 10:43am

physics
How many electrons pass through a lamp in 3 minutes.If the current is 300 ma?
Sunday, July 6, 2014 at 10:36am

physics
How much force is needed to accelerate a 50kg rider and his 250kg motorcycle at 4m/s27
Sunday, July 6, 2014 at 6:45am

PHYSICS
he following data were obtained for the position of a ball as it rolled along a straight track DISPLACEMENT (CM) 2.90 7.40 11.00 22.70 31.10 TIME 0.60 2.10 3.30 7.20 10.00
Sunday, July 6, 2014 at 4:43am

PHYSICS
the following data were obtained for the position of a ball as it rolled along a straight track DISPLACEMENT (CM) TIME 2.90 0.60 7.40 2.10 11.00 3.30 22.70 7.20 31.10 10.00
Sunday, July 6, 2014 at 4:40am

PHYSICS
an ant walks 22 cm in a northerly directions turns and walks southeasterly (45 degree East Of South) a distance of 47 cm what is a resultant displacement?
Sunday, July 6, 2014 at 4:37am

PHYSICS
a motorcycle is driven 50 km west then 30 km south and 25 km 30 degree west of south show the vector diagram find the total displacement of motorcycle
Sunday, July 6, 2014 at 4:21am

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

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