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A block is hung by a string from the inside roof of a car. When the car goes straight ahead at a speed of 21 m/s, the block hangs vertically down. But when the car maintains this same speed around an unbanked curve (radius=150 meter), the block swings toward the outside of the curve. Then the string makes an angle with the vertical. Find what the angle.
q1. a roller-coaster car speeds down a hill past point a where r1 10.0 m and then rolls up a hill past point b where
Four equal masses m=0.5kg are placed on the corners of a square ofnegligible mass, whose sides are 0.4m long. What is the kinetic energy of the system
A ball is shot from the top of a building with an initial velocity of 20m/s at an angle ? = 42? above the horizontal. What are the x and y components of the initial velocity
A plastic bag is filled with hydrogen at atmospheric pressure and 18.0 oC. Assume that the mass of the bag is negligible and take the temperature of the outside air to be 0 oC. With the help of this "balloon" we want to lift a 44.0 kg girl off her..
A neutron star is composed of neutrons and has a densitythat is approximately the same as that of a nucleus. What is the radius of a neutron star whose mass is one-fifth of the mass of the sun
When driving west toward the Rocky Mountains, you see a peak 2.8 degrees above the horizon. Your GPS gives your current elevation as 1500 m , and according to the map, you're 22.5 km (horizontally) from the peak. Find the peaks elevation.
A sledge loaded with bricks has a total mass of 17.0 kg and is pulled at constant speed by a rope inclined at 19.9° above the horizontal. How much work is done by the rope on the sledge
Some bacteria are propelled by biological motors that spin hair-like flagella. How long does it take the motor to make one revolution
q1. to stretch a relaxed biceps muscle 2.8 cm requires a force of 25 n. find out the youngs modulus for the muscle
lenzs law is said to be a consequence of the principle of conservation of energy. explain this statement by describing
A steel rivet 1.50 cm long and 1.5 mm radius has one end attached to a wall. If the other end is subjected to a shearing force of 6.0 × 104 N, what is the downward deflection
question a small sphere with a mass of 0.002g and carrying a charge of 510-8c hangs froma thread near a very large
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