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1. A car has an initial speed of 15 ms-1 when a truck rolls out of a driveway 18 m ahead of it. The driver takes 0.35 s to react before applying the brakes. If the car is to just be able to stop before hitting the truck the deceleration of the car will be nearest to:
2. A rock is thrown vertically upwards with a velocity of 30 m.s-1 from the top of a 25 m high building. When it falls back down it just misses the building and falls to the ground. The acceleration due to gravity is 9.8 m.s-2. Find the nearest total time of flight of the rock
A mining lift, with a 80kg cage, should be able to pull up to the surface ten 90kg miners, from a 20m deep well, in 20s. If the gearboxes available have an efficiency of 75%, what should be the power rating of the DC motor used. If the driving gear p..
Two particles of mass m and 2m are connected by massless rod oflength L. What is moment of inertia of the rod
A tennis ball is thrown straight up with initial velocity V→o. Assuming that the air drag on the ball varies with velocity as cv2, (c >0) where c is the coefficient of friction. How long will it take for the ball to reach to top
A dog has thick fur, with a thermal conductivity of 0.040W/(m • K). The dog's metabolism produces heat at a rate of45 W, determine what is the outside temperature
for a single isolated point charge carrying a charge of q 68.7 pc one equipotential surface consists of a sphere of
An iron disk has a radius of 0.445 m and a mass of 367 kg. The disk is mounted on its axis so that it is free to spin. If the torque is applied at the edge of the disk, how much force is required
An athlete swings a ball, connected to the end of a chain, in a horizontal circle. The athlete is able to rotate the ball at the rate of 7.69 rev/s, Which rate of rotation gives the greater speed for the ball
What is the radius of the turn?
A defiblirator is used during a heart attact to restore theheart to its normal beating ppattern. How much charge moves during this time
The motor of a table saw is rotating 3450 rev/min. A pulley attached to the motor shaft drives a second puller of half the diameter by means of a V-belt. Compute the radial acceleration of points on the outer edge of the blade
The max wavelength of light, which emits electrons is 460 nm. Calculate work function of sodium
a 100 w incandescent light bulb converts approximately 2.5 of the electrical energy supplied to it into visible light.
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