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Question: A radiation detector indicates the decay activity of a radioactive material. Which would have a higher reading a material with long half life or a material with short half life?
A laser beam of power 4.40 W and diameter 2.70 mm is directed upward at one circular face of a perfectly reflecting cylinder, which is made to "hover" by the beam's radiation pressure
At rest, a car's horn sounds at a frequency of 480 Hz. The horn is sounded while the car is moving down the street. A bicyclist moving in the same direction with one-third the car's speed hears a frequency of 470 Hz. What is the speed of the car?
A uniform sphere with mass 57.0kg is held with its center at the origin, What is the magnitude of the net gravitational force due to these objects on a third uniform sphere with mass 0.510kg placed at the point x= 4.00m, y = 0
A hot iron horseshoe (mass = 0.38 kg), just forged (Fig. 14-16), is dropped into 1.68 L of water in a 0.33 kg iron pot initially at 20 °C. estimate the initial temperature of the hot horseshoe
water at TL= 30 degrees celsius is used as a low temperature reservoir for an energy plant, what is the largest electrical output the enery plant delivers
A magician pulls a tablecloth from under a 200 g mug located 30.0 cm from the edge of the cloth. The cloth exerts a friction force of 0.100 N on the mug, and the cloth is pulled with a constant acceleration of 3.50 m/s2.
A baseball player hits a double and ends up on second base. A baseball "diamond" is a square, each side of length 27.4 m, with home plate and the three bases on the four corners. What is the magnitude of the player's displacement?
High-impact activities are hard on the joints and can cause significant damage to the cartilage in the knees. what is the maximum change in thickness of the cartilage
A train is approaching a highway crossing at a speed of 40 m/s. What frequency would the driver hear if the train stopped
An aluminum ball does not fit through a brass ring at 20oC. The diameter of the ball is 2.001 cm, At what temperature does the ball just fit through the ring
An old bucket of mass 6.75kg hangs in awell at the end of a rope. What is the total work done on the bucket
A simple of helium gas occupies 5 liters at 22degree C and a gauge pressure of 200,000 pascals. What is the mass of the gas
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