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Q1. Assume a small child rolls off a bed that is 0.4 m above floor. If the floor is hardwood, the child's head is brought to rest in approximately 2 mm. If the floor is carpeted, this stopping distance is increased to about 1cm. computed the magnitude and duration of the deceleration in both cases, to determine the risk of injury. Presume the child remains horizontal during the fall to the floor. Note that a more complicated fall could result in a head velocity greater or less than the speed you calculate.
Q2. A heavy crate rests on the bed of a flatbed truck. When truck accelerates, the crate remains where it is on the truck, so it, too, accelerates. What force causes the crate to accelerate? Does force change if the truck is on an incline or on level ground? If it changes, what is difference?
Weight of a box is 150 pounds. The horizontal force required to move the box is 70 lb. What horizontal force is required if 60lbs is added to box.
A train is travelling up a 4.40 incline at a speed of 3.30 when the last car breaks free and begins to coast without friction. How long does it take for the car to come to rest? How far does the car travel.
Find the energy, in joules, of one quantum of energy for an atomic oscillator in a block of aluminium.
A 27 pound meteorite struck a car, leaving a dent 21 cm deep in the trunk. If the meteorite struck the car with a speed of 500 m/s, what was the magnitude of its deceleration, assuming it to be constant.
Two projectiles are thrown with the same initial speed, one at an angle with respect to the level ground and the other at angle 90 degree. Both projectiles strike the ground at the equivalent distance from the projection point. Are both projectiles i..
Macaroni and cheese packages specify how long to cook the pasta in boiling water. Calculate the concept relating temperature and pressure in cooking of food.
Discover the magnitude of acceleration
What's the advantage of launching space vehicles from high flying aircraft in place of from the ground.
What is the greatest amount through which the wavelength of an incident photon could change when it undergoes Compton scattering from an atom or molecule with a 19 u mass.
Obtain an expression for the velocity
If you now place a pencil under the edge of the mirror nearer the wall, tilting it upward by 5.0, how much higher on the wall is the spot?
A water pipe is inclined 32.0° below the horizontal. The radius of the pipe at the upper end is 3.00 cm. If the gauge pressure at a point at the upper end is 0.117 atm, what is the gauge pressure at a point 2.65 m downstream, where the pipe has narro..
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