In early test flights for a space shuttle using a "glider" (mass of 1000kg including pilot), it was noted that after a horizontal launch at 500 km/h at a height of 3500m, the glider eventually landed at a speed of 200 km/h. a) What would its landing speed have been in the absence of air resistance?b) What was the average force of air resistance exerted on it if it came in at a constant glide of 10 degrees to the Earth?

(2) (a) you have a simple circuit that consists of only a battery (δvbat=1.5v) and two resistors with resistance r1=10ω and r2=5ω, connected in series with each other. what is the current running through the battery? (b) you re-arrange your circuit so now r2 is attached in parallel to r1 rather than in series. what is the current running through the battery? (c) you add an additional resistor r3=7ω on the same branch as r2. what is the current running through the battery? (d) what is the power dissipated in r3?

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?

How much energy must a refrigerator absorb from 225 g of water so that the temperature of the water will drop from 35°c to 5°c