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Question1
A 1200-kg automobile travels at a speed of 12 m/s.
(a) what is it the kinetic energy?
(b) What is work that would be required to bring it to a stop?
(c) If the force that causes it to stop is a constant 1250 N, how far before it stops?
Question2
A 0.500-kg ball is thrown vertically upward with an initial speed of 10.0 m/s. If initial potential energy is taken as zero, find balls-
a) Kinetic energy 1.00 m above initial position
b) potential energy 1.00 m above initial position
c) mechanical energy 1.00 above initial position
Two poles, one of which is 5 times as strong as the other, exert on each other a force equal to 0.8x10^-3 kgf, Find the strength of each pole
Points A and B have electric potentials of 320 and 160, respectively. When an electron released from rest at point A arrives at point C, its kinetic energy is.
A crate with mass 36.0 initially at rest on a warehouse floor is acted on by a net horizontal force of 142. Explain how far does it travel in 12s and what is its speed at that time?
A patients blood pressure is measured as 140 / 80, measured in level with the heart. What would you expect the blood pressure to be at the top of the head if there is a 45cm height difference in the two points. Density of blood is 100kmm-3. Give r..
A 30 kg box is pushed by a horizontal force of 900. N as it slides up a plane inclined at an angle of 30 degrees with the horizontal. The coefficient of friction between box and plane is 0.20. How far-off will the box travel along the plane in 5.0..
Assume that the rod is held at rest horizontally and then released. (Throughout the remainder of this problem, your answer may include the symbol, moment of inertia of the assembly, whether or not you have answered the first part correctly.)
A transformer connected to a 125 V (rms) ac line is to supply 12000 V (rms) for a neon sign. What current rating should the fuse in the primary circuit have
A tennis player swings her 1000 g racket with a speed of 15.0m/s . She hits a 60 g tennis ball that was approaching her at a speed of 15.0m/s. compute the average force that the racket exerts on the ball
A diffraction grating produces a first order maximum at an angle of 20.0°. What is the angle of the second order maximum
The pilot of an aircraft wishes to fly due west in a 30.8 km/h wind blowing toward the south. In what direction should the aircraft head
A 2,200-kg pile driver is used to drive a steel I-beam into the ground. calculate the average force the beam exerts on the pile driver
An aluminum wire having a cross-sectional area of 4.00 3 1026 m2 carries a current of 5.00 A. Find the drift speed of the electrons in the wire
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