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Question1
A knight sits on a castle wall during a siege. To while away time, he notes that boulders catapulted from below land on the top of his wall with a vertical velocity of 8.5 m/s. If he is 34 m above the catapult, what is an initial velocity of the boulders? The acceleration of gravity is 9.8 m/s2.
Question2
In a lab experiment you note than an object experiences a steady decrease in temperature with the passage of time. If that object is absorbing 100 units of radiant energy every second, what should be true about the amount it emits?
Describe the answer with reference to the concept of radiative equilibrium.
A small glass bead has been charged to + 25nC . A tiny ball bearing 3.0cm above the bead feels a 1.8×10?2Ndownward electric force. What is the charge on the ball bearing
A square plate is 2.4 × 10^-2 m thick, measures 4.5 × 10^-2 m on a side, and has a mass of 7.2 × 10^-2 kg. determine the maximum possible amount of shear strain
Suppose a car's brakes can produce an acceleration of -7 m/s2. what is the minimum distance necessary to stop the car
A boat crosses the river from the south shore to the north shore by maintaining a constant velocity of 10.9 m/s due north relative to the water. If the river is 362 m wide, explain how far downstream is the boat when it reaches the north shore?
A circular loop carries a current I = 20A, and the magnetic energy density at the loop's center is equal to 6 mJ/m^3. What is the radius of the loop
Gas in a container is at a pressure of 1.5 atm and a volume of 4.0m3. What is the work done on the gas (a)if it expands at constant pressure to twice its initial volume? (b) if it is compressed at constant pressure to one-quarter its initial volum..
A bat at rest sends out ultrasonic sound waves at 49.4kHz, What is the received sound frequency
A point charge of ?3.3 ?C is located in a uniform electric field of 34 N/C. You move the charge, find the resulting change in the electric potential energy of the system
An MSU linebacker of mass 118.0 kg sacks a UM quarterback of mass 87.0 kg. Just after they collide, they are momentarily stuck together, how fast was the linebacker moving just before the collision
Two small insulating spheres with radius 9×10-2 are separated by a large center-to-center distance of 0.52. One sphere is negatively charged.
A child in a boat throws a 3.50 kg package out horizontally with a speed of 15m/s. Calculate the velocity of the boat immediately after, assuming it was initially at rest. The mass of the child is 25kg and that of the boat is 70kg. Ignore water re..
Lead has a latent heat of fusion of 2.32x10^4 J/kg, a specific heat of 128 J/(kg K), and a melting point of 228°C. determine velocity needed to achieve melting the bullet
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