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You throw a ball upward with an initial speed of 4.6 {\rm m/s}. When it returns to your hand 0.94 {\rm s} later, it has the same speed in the downward direction (assuming air resistance can be ignored). What was the average acceleration vector of the ball?
Keeping a constant speed of 0.6 m/s, a marble of mass 18 g rolls back & forth across a shoebox that is 14 cm high & 2 mm thick. Estimate the probability of its escaping through the wall of the box by quantum tunnelling.
Why is the thermal energy not shared instantaneously with the rest of the block to warm it as a whole?
A spherical balloon of volume 4.08 103 cm3 contains helium at a pressure of 1.21 105 Pa. How many moles of helium are in the balloon
A piece of Nichrome wire has a radius of 6.2 x 10-4 m. It is used in a laboratory to make a heater that dissipates 4.40×102 W of power when connected to a voltage source of 130 V. estimate the necessary length of wire
An Australian emu is running due east in a straight line at a speed of 12.5 m/s and slows down to a speed of 11.4 m/s in 7.3 s. (a) What is the direction of the bird's acceleration? north south east west.
A 100-kg object and a 400-kg object are separated by 4.20 m. Find the magnitude of the net gravitational force exerted by these objects on a 64.0-kg object placed midway between them
The mass of Venus is 81.5% that of the earth, and its radius is 94.9% that of the earth. If a rock weighs 75.0N on earth, what would it weigh at the surface of Venus
Mabel walks down a straight hall from a bench to the door of her spanish class at a rate of 1.4m/s for 28 s, then she realizes she forgot her folder. Compute Mabel's average speed
The Earth can be approximated as a sphere of uniform density, rotating on its axis once a day. What is the moment of inertia of the Earth
A rubber ball of mass 37.0 g is dropped from a height of 1.80 m onto a floor. What impulse was applied to the ball during the collision
A converging lens can be used as a lighter (on a sunny day). If you want to use it to light a match, where should you put the match, What is the radius of the mirror
A sphere of radius 6.21 cm and uniform surface charge density, Find the separation between the point charge and the center of the sphere
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