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Q. Gillian buys a pendulum clock at a discount store and discovers when she gets it home that it loses 6.00 minutes each day.
a) Should she lengthen or shorten the pendulum in order for it to keep accurate time?
b) If the pendulum has a period of 2.00 s, by how much must the length be changed so that the clock keeps accurate time?
An astronaut in a satellite says she can just barely resolve two point sources on the Earth, 110km below. Assume λ=540nm, and the pupil diameter of the astronaut's eye to be 5.20mm.
35 kg girl is bouncing on a trampoline. Throughout a certain interval after leaving the surface of the trampoline, her kinetic energy decreases to 170 J from 470 J. How high does she rise during this interval? Avoid air resistance.
A dish of hot food has an emissivity of 0.40 and emits 20 W of thermal radiation. If you wrap it in aluminium foil, which has an emissivity of 0.008, how much power would it radiate.
King Arthur's knights fire cannon from the top of the castle wall. The cannonball is fired at a speed of 60 m/s and an angle of 33. A cannonball that was accidentally dropped from the top of the castle wall hit the moat below in 1.80s.
An airplane is flying with a velocity of 97.0 at an angle of 25.0 above the horizontal. while the plane is a distance 103 directly above a dog that is standing on level ground, a suitcase drops out of the luggage compartment. How far from the dog ..
The wire is cut at point P. Will the potential difference between points A and B increase, decrease, or remain the same? Give reason for.
At what angle is the curve banked? The acceleration due to gravity is 9.8 m/s2.
What is relative velocity
At t=0 a grinding wheel has an angular velocity of 30.0 rad/s. It has a constant angular acceleration of 31.0 rad/s^2 until a circuit breaker trips at time t = 2.00 s. From then on, it turns through an angle 428 rad as it coasts to a stop at constant..
Two packages at UPS start sliding down a ramp 40 degrees from the horizontal, Package A is sliding down in front of Package B. Package A has a mass of 3.50 and a coefficient of kinetic friction of 0.220. Package B has a mass of 8.00 and a coefficient..
Calculate change in kinetic energy
He would like a prescription for contact lenses to serve the same purpose. What is the exact contact lens prescription, in diopters.
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