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A 1967 Kennedy half-dollar has a mass of 1.150 x 10-2 kg. The coin is a mixture of silver and copper, and in water weighs 0.1012 N. Determine the mass of silver in the coin. Give your answer to two significant figures.
when combing your hair, you transfer electrons from the hair onto the comp. is your hair then positively or negatively charged? how about the comb.
Assume that the universe is a spherical cavity with a radius of 10^26 m and temperature of 2.7 K. How many thermally excited photons are there in the universe
q1. a sled and rider with a combined weight of 68 kg are at rest on the top of a hill 28 m high. what is their total
A 168 kg polar bear standing 1.2 meters tall walks onto a floating sheet of ice 0.305 m thick. What is the surface area of the ice floe
You throw a ball vertically upward so that it leaves the ground with velocity 6.05 m/s. (a) What is its velocity and direction when it reaches its maximum altitude? magnitude m/s
Two violinists, one directly behind the other, play for a listener directly in front of them. Both violinists sound concert A (440 Hz), What is the smallest separation between the violinists that will produce destructive interference for the listene..
a golf ball of mass 0.050 kg is at rest on the tee and has a velocity of 102 m/s immediately after being struckif the club, what is the average force exerted on the ball
A solid cylinder of mass M = 2.59 kg is released from rest at the top of an incline of height H= 1.99 m and rolls without slipping to the bottom. Calculate the speed of the cylinder's center of mass at the bottom of the ramp
A 8760-kg car is travelling at 29.7 m/s when the driver decides to exit the freeway by going up a ramp, What is the magnitude of the average drag force exerted on the car
A small ball is attached to one end of a spring that has an unstrained length of 0.179 m. By how much would the spring stretch if it were attached to the ceiling and the ball allowed to hang straight down
A box-shaped wood stove has dimensions of 0.75 m x 1.2 m x 0.40 m an emissivity of 0.80, Calculate its rate of radiation into the surrounding space
A long, straight wire of length 1.3 m carries current I = 3.1 A. what is the magnitude of the force on the wire
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