Would someone explain how to get the answer? you for any ! : )

felipe weighs 50 pounds. he runs up a 4 foot flight of stairs in 10 seconds. what is felipe's power output?

4 ft-lbs./sec
10 ft-lbs./sec
20 ft-lbs./sec
50 ft-lbs./sec

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

This is important. 1. which of the following is an si base unit for measuring length? (2 points) inch gram meter mole 2. which of the following units for distance is an si unit? (2 points) centimeter foot inch yard 3. which of the following tools should a scientist use to measure an object in meters? (2 points) electronic balance pan balance tape measure thermometer

Explain what it means to view something from a frame of reference. provide an example that illustrates your explanation. (4 points)