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Q1. A car is travelling at 46.0 km/h on a flat highway.
If the coefficient of friction between road and tires on a rainy day is 0.10, what is the minimum distance in which car will stop?
What is the stopping distance while the surface is dry and the coefficient of friction is 0.600?
Q2. A playground is on the flat roof of a city school, 5 m above the street below (see figure). The vertical wall of the building is h = 6.20m high, to form a 1.20 m high railing around the playground. A ball has fallen to the street below, and a passerby returns it by launching it at an angle of θ = 53.0° above the horizontal at a point d = 24.0m from the base of the building wall. The ball takes 2.20s to reach a point vertically above wall.
A particular organ pipe can resonate at 213 Hz, 355 Hz, and 497 Hz, but not at any other frequencies in between. What is the fundamental frequency of pipe.
Calculate the threshold wavelength, in nm, of a metal if that metal emits an electron with a kinetic energy of 6.32 × 10-19 J when illuminated with light that has a frequency of 1.97 × 1015 Hz.
Horse races once around a circular track in a time of 176 s, with a speed of 26 m/s. What is the radius of the track.
A 120 g trick baseball is thrown at 51 km/h. It explodes in flight into two pieces, with a 50 g piece regular straight ahead at 86 km/h. How much energy do the pieces gain in the explosion.
A string of 13 identical Christmas tree lights are connected in series to a 127 V source. The string dissipates 63 W. What is the comparable resistance of light string.
An alpha particle (m = 6.7 x 10^-27kg, q = +3.2 x 10^-19C) has a speed of 30km/s at point A and moves to point B where it momentarily stops. Only electric forces act on the particle throughout this motion. Find out the electric potential difference.
Chef at the infamous Fattening Tower of Pizza tosses the spinning disk of uncooked pizza dough into the air. The disk's diameter increases during the flight, whereas its rotational speed.
A dynamite blast at a quarry launches a rock straight upward, and later it is rising at a rate of 15m/s. Assuming air resistance has no effect on the rock, calculate the total time the rock is in the air.
How to find the position and height of an image
A gun shoots bullets that leave the muzzle with a speed of 336 m/s. If a bullet is to hit a target 136 m away at the level of the muzzle, the gun has to be aimed at a point above the target. How far above the target is this point.
The lander is 8.2 meters above the surface and has the downward speed of 0.89 m/s while the engine is cut off. What is the speed of the lander just before it touches the surface.
Two long thin parallel wires 13.0 cm apart carry 32 A currents in the same direction. Determine the magnetic field at point P, 12.0 cm from one wire and 5.0 cm from the other.
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