A roller coaster car starts out at rest at the top of the first hill and reaches a speed of 10 m/s at the bottom of the hill. What is its speed when it is half-way down? Assume that the track is frictionless...

A roller coaster car starts out at rest at the top of the first hill and reaches a speed of 10 m/s at the bottom of the hill. What is its speed when it is half-way down? Assume that the track is frictionless...

A 500 kg roller coaster car crests a 20 m high hill at a speed of 10 m/s. It then rolls down the other side, all the way to ground level, and climbs a second hill. What is the speed of the car when...

A pendulum, 2.0 m in length, is released with a push when the string is at an angle of 25° from the vertical. If the initial speed of the pendulum is 1.2 m/s, what is its speed at the bottom of the...

possible answers below none of the above its potential energy is constant its total mechanical energy is constant work is being done by a non-conservative forc &nbs...

A 6.00 kg block slides down a 3.40 m long inclined plane. The speed of the block at the bottom is 5.40 m/s. If the height of the plane is 2.00 m, what is the work done by friction? Im...

I'm editing this problem because I was able to get a couple of the answers, but I still need help on the rest. An electromagnatic wave is traveling in vacuum with frequency 7 x 1014 Hz. The wave has...

Assume that g=9.8m/s^2

A force of 250 N pushes a 50 kg box along a horizontal surface. The force is directed 30o below the horizontal. What is the acceleration of the box if the coefficient of kinetic friction between the...

A 500 N weight is hung at the middle of a rope attached to two buildings at the same level. The cable will break if the tension exceeds 1800 N, what is the minimum angle the rope can make with the...

possible answers: gravity alone gravity and the original force cannot be determined the original force alone

I know the correct answer is 1.5, but i am unsure as to how one arrives to the answer. Also what would the resulting acceleration be in this problem?

Also find the find the cliff height and the horizontal distance from the cliff.

Sorry for the word errors. It will only allow so many characters.

Find the magnitudes of the x, y, and z components of the vector vector A shown in Figure 3-41, given that A = 75 m and θ = 56°. http://www.webassign.net/walker/03-38alt.gif

A sailboat race course consists of four legs, defined by the displacement vectors A, B, C, and D, as the drawing indicates. The magnitudes of the first three vectors are A = 3.40 km, B = 5.10 km,...

A golfer, putting on a green, requires three strokes to "hole the ball." During the first putt, the ball rolls 5.0 m due east. For the second putt, the ball travels 2.1 m at an angle 20°...

Part a is as follows: A long cylindrical insulator has a uniform charge density of 1.89 μC/m3 and a radius of 5 cm. What is the electric field inside the insulator at a distance of 4 cm?...

A 1.00-kg block is pushed along a rough horizontal floor with a horizontal force of 5.00 N for a distance of 5.00 m. If the block is moving at a constant velocity of 4.00 m/s, find... The...

A hockey puck is hit on a frozen lake and starts moving with a speed of 12.0 m/s. Five seconds later it's speed is 6.00 m/s. What is the average value of the coefficient of kinetic friction between...

A dlock worker loading crates on a ship finds that a 20 kg crate, initially at rest on a horizontal surface requires a 75-N horizontal force to set it in motion. However, after the crate is...

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