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A boy enters a tall tower, needing to know its height. He notes that a long pendulum extends from the ceiling almost to the floor and that its period is 15.0 second.
(a) Evaluate how tall is the tower?
m
(b) If this pendulum is taken to the Moon, where the free-fall acceleration is 1.67 m/s2, find what is the period there?
s
A retired bank president can easily read the fine print of thefinancial page when the newspaper is held no closer than at arm'slength, What should be the focal length of an eye glass lens
A light bulb is wired in series with a 119- resistor, and they are connectedacross a 120.0-V source. The power delivered to the light bulb is22.3 W. What is the resistance of the light bulb? There are twopossible answers. Give the larger of the two.
A football is thrown horizontally with an initial velocity of (18.9 m/s)x. Calculate the direction of the velocity with respect to the positive x-axis at this time
A student applies a 20.-newton force to move a crate at a constant speed of 4.0 meters per second across a rough floor
The isotope 64Cu can decay by EC, beta- and beta + transtions, calculate the average enrgies of emitted beta- and beta +
The gas is first cooled at constant volume until it reaches its final pressure. It is then allowed to expand at constant pressure until it reaches its final volume. Find the heat absorbed by the gas during this process
a -N block hangs from the second spring. A block of unknown weight hangs from the third spring. find the weight of the block hanging from the third spring
A 2 kg projectile is shot straight up with initial velocity v0= 50 m/s. find the Maximum value of the gravitational potential energy
A lab will soon be able to accelerate electrons at restthrough a potential voltage of 12x1012 V. what is the electron's speed after being accelerated
A hoop and a disk, both of 0.72- m radius and 4.0- kg mass, are released from the top of an inclined plane 2.5 m high and 8.9 m long. What is the speed of the hoop
A 6-kg bucket of water is being pulled straight up by a string at a constant speed. What is the tension in the rope
a 1.00-kg mass m1 on a frictionless inclined surface is connected to a 2.00-kg mass m2.the pulley is massless and
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