Consider a building that used 12 × 106 Btu for heating over the period of 30 days. What average power does this correspond to? Show your calculations here:
You have a 90 W electrical appliance that is on 24 hours per day. At $0.51 per kWh, how much are you paying daily for electricity to operate this appliance?Show your calculations here:
a 1.00kg piece of aluminum metal at 90 degrees Celsiusis placed in 4 L (=4.00kg)of water at 25°C determine the final temperature
A 62kg rock climber is attached to a rope that is allowing him to hang horizontally with his feet against the wall. The tension in the rope is 710N and the rope makes an angle of 32 degrees with the horizontal. Determine the force exerted by the wall on the climber's feet. Answer is 710N, Why?
A helicopter flying west begins experiencing an acceleration of 3m/s2 east. Will the magnitude of its velocity increase or decrease?
Use the position equation given below, where s represents the height of the object (in feet), v0 represents the initial velocity of the object (in feet per second), s0 represents the initial height of the object (in feet), and t represents the time (in seconds), as the model for the problem. s = –16t2 + v0t + s0 You drop a coin from the top of a building. The building has a height of 942 feet. (a) Use the position equation to write a mathematical model for the height of the coin. s=__________ (b) Find the height of the coin after 4 seconds. s = _______ ft (c) How long will it take before the coin strikes the ground? (Round your answer to two decimal places.) t = _______ sec
