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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
The density of an ideal gas is found to vary with temperature according to the equation d=PM/RT, where P and M were held constant in this case.
Common transparent tape becomes charged when pulled from a dispenser. If one piece is placed above another, the repulsive force can be great enough to support the top piece\'s weight.
The length between lenses equals 1m, the eyepiece has a focal point of 32mm, what is the magnification of an object at infinity
A skier finds that she must give hersel a push to get started down ski slopes with angles less than 8 degrees. What is the coefficient of static friction between the skis and the snow
When viewed by an observer on the Earth, light from a distantgalaxy is Doppler shifted to the red such that the ratio of the unshifted frequency to the observed frequency is 2.9. What is the galaxy's speed relative to the Earth?
A small girl and boy take a sled up to the top of a snow covered slope which is inclined 30 degrees above the horizontal, How fast are they going at the bottom
Suppose a bat uses sound echoes to locate its insect prey, 3.00 m away. What is the percent uncertainty does this cause for the bat in locating the insect
Two children with masses of 23 and 41 kg are sitting on a balanced seesaw. If the lighter child is sitting 3 m from the center, where is the heavier child sitting from the center
A football kicker can give the ball an initial speed of 27 m/s. He is 48 m from the goalpost which has a crossbar 2.72 m high. What is the smallest angle of elevation that he can kick the football and score a field goal
two charges -17 c and 5.5 c are fixed in place and separated by 2.3 m. a at what spot along a line through the charges
charges q q and -q are placed on the x-axis of x0 x2m and x4m respectively. at which of the following points does the
The temperature at a point 50 km north of a station is 3 degree C coolor than at the station. If the wind is blowing from the northeast at 20 m s^-1 and the air is being heated by radiation at the rate of 1 degree C H^-1, what is the local temperatur..
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