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Rocky's base metabolic rate is 100 W (when not exercising). He weighs 80 kg. This morning, he climbed stairs 25-cm high at the rate of 140 steps per minute for 30 minutes on a Stairmaster. Assume potential energy is expended climbing up and 20% of that energy is used climbing down.
a. How much energy did he burn (in J and in kWh)?
b. What was his total average power (in W) during the exercise?
A device used in radiation therapy for cancer contains 6.30×10-1 g of cobalt 2760Co (59.9333819 u). Determine the activity of the radioactive material
Two point charges 1.9cm apart have an electric potential energy -150?J . The total charge is 30nC
A steam catapult launches a jet aircraft from the aircraft carrier John C. Stennis, giving it a speed of 210 mi/h in 3.00 s. Find the average acceleration of the plane
Four point charges, each with Q = 8.8 µC, are arranged at the corners of a square of edge length 1.4 m. What is the electric potential at the center of the square
A person has a far point of 33 cm. What power glasses would correct this vision if the glasses were placed 2.1 cm from the eye
A glider of mass 0.155kg is moving to the right on a frictionless, horizontal air track with a speed of 0.760m/s. Find the magnitude of the final velocity of the 0.155kg glider
A boy scout ‘s girl scout girlfriend to test his scouting abilities has hidden her girl scout cookies somewhere in the forest and has given him the directions to retrieve them, How far away are the cookies
q1. a ball is thrown directly up from the ground with speed vsub0. at the same time a second ball is dropped from rest
find the energy in joules of the photons.
A 50g ball travelling at 25m/s is bounced off a brick wall and rebounds at 22m/s. A high speed camera records this event. If the ball is in contact with the wall for 3.5ms, what is the average acceleration of the ball throughout this time interval..
The density of water in Earth's hydrosphere and the density of rocks in the crust are both lower than the average density of the planet as a whole
In the Biomedical and Physical Sciences building at MSU there are 132 steps from the ground floor to the sixth floor. Each step is 16.6 cm tall. How many food Calories did the person burn during the walk
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