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Describe in 1-2 sentences how the discovery of the period-luminosity law by Henrietta Leavitt makes it possible to calculate distances.
The current in a 50.0 mH inductor changes with time as I = 2t2 - 5t (in SI units). At what time is the emf zero
A roofer accidently drops a bundle of shingles. If it hits the ground with a speed of 86 m/s, how fast was it moving 3 seconds earlier (g=10 m/s/s)
Suppose the moon were held in its orbit not by gravity but by a massless cable attached to the center of the earth. What would be the tension in the cable
sir dudley the dextrous is loading cannons on top of the castles tallest towers in preparation for an expected attack.
A skier is gliding along at 3.0 m/s on horizontal, frictionless snow. He suddenly starts down a 13 degree incline. His speed at the bottom is 13 m/s. What is the length of the incline
A 0.48-kg object connected to a light spring with a force constant of 23.6 N/m oscillates on a frictionless horizontal surface. The spring is compressed 4.0 cm and released from rest.
How high a tree would a 79.0 kg person have to climb to increase his gravitational potential energy relative to the ground by that amount.
In this problem, the question tells us that there are two springs connected to each other, and that the spring constant of each of them is 6430 N/m. Can someone explain why the total effective spring constant of the 2 springs is k/2 and not just 6430..
To the unaided eye, the planet Jupiter has an angular diameter of 50 arc seconds. What will its angular size be when viewed during a 0.75 m focal length refracting telescope by an eyepiece whose focal length is 30 mm?
A uniform thin rod of length 0.400 m and mass 4.50 kg can rotate in a horizontal plane about a vertical axis through its center. what is the bullet's speed just before impact
A football is thrown at an angle of 38 above the horizontal. Assume the ball is throw and received at the same height. what must be the initial speed of the ball
a compound pendulum mass m is at rest hanging freely from a point o distance l from its center of gravity g. it has a
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