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Question1
Two cars drive on a straight highway. At time t=0, car 1 pass mile marker 0 travelling due east with a speed of 20m/s. At the same time, car 2 is 1km east of mile marker 0 travelling 30m/s west. Car 1 is speeding up with an acceleration of magnitude 2.5m/s, and car 2 is slowing down with an acceleration of magnitude 3.2m/s.
(a) Write x-versus-t equations of motion for both cars, taking east as the positive direction.
(b) At what time do the cars pass after that to one another?
Question2
Ann is driving down a street at 63 km/h. rapidly a child runs into the street. If it takes Ann 0.799 s to react and apply the brakes, how far will she have moved before she begins to slow down? Response in units of m
The speed of a bobsled is increasing because it has an acceleration of . At a given instant in time, the forces resisting the motion, including kinetic friction and air resistance, total 500 N.
A map of a burned area obtained from remote sensing contains 120 pixels. The remote sensing image shows that the fire is isolated to 73 of the 120 pixels.
A 0.75?F capacitor is charged to 90V . It is then connected in series with a 35? resistor and a 150? resistor, How much energy is dissipated by the 35? resistor
For exercise, a 60 kg athlete runs up a 10-m high hill in 30 seconds. Assume the efficiency of the human body is 25%. Determine her metabolic power
In a serve, a tennis player hits the ball horizontally. Neglect the effects of air resistance and the diameter of the ball. Where will the ball land if it just clears the net
A 405 Hz sound wave travels through a substance. The wavelength of the sound wave is measured to be 2.7 meters. What is the speed of sound in the substance
In one design, the large spring with spring constant 2.0×10^4 was placed behind the cannon. The other end of the spring braced against a post that was firmly anchored to the ship's frame.
Two small insulating spheres with radius 9×10-2 are separated by a large center-to-center distance of 0.52. One sphere is negatively charged.
assume that a proof plane is a conducting disc with a radius of 1.0 cm and is used to transfer some charge from the sphere described above. How much charge will be transferred in one scoop
In a 45° - 90° - 45° prism with a ray of light entering and exiting on the long side of the prism after undergoing two total internal reflections. Determine the minimum index of refraction of the prism in order for this to occur
Start from the expression of the electric filed outside an infinite sheet of uniform surface charge density
A 0.05 kg bullet traveling at 600 m/s hits a 7.4 kg block of wood and stays in the wood. What is the velocity (speed)of the wood block
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