Physics, 24.12.2019 01:31 davismar3

Trevor is pulling his younger brother in a wagon. he pulls the wagon 50 m to the corner with a force that is a parallel with the ground. he then turns the wagon around and pulls it 50 m back to the starting point with the same force at an angle of 30 degrees with respect to the ground. how does the amount of work trevor performs going to the corner compare with the amount of work he performs coming back?
a) they are the same because he uses the same amount of force
b) they are the same because he travels the same distance
c) he does less work coming back because the force moving the wagon is only 50cos30
d)he does more work coming back because the force moving the wagon is only 50cos60

Answers: 3

Show answers

Other questions on the subject: Physics

Physics, 22.06.2019 10:50, milkshakegrande101

Asubject in a clinical research trial experiences a serious, unanticipated adverse drug experience. how should the investigator proceed, with respect to the irb, after the discovery of the adverse event occurrence? a. do not report the adverse drug experience to the irb since it is a common adverse experience. b. report the adverse drug experience to the irb only if there are several other occurrences. c. report the adverse drug experience as part of the continuing review report. d. report the adverse drug experience in a timely manner, in keeping with the irb's policies and procedures, using the forms or the mechanism provided by the irb.

Answers: 1

continue

Physics, 22.06.2019 14:20, jeny89

4r-134a enters the condenser of a residential heat pump at 800 kpa and 50°c at a rate of 0.022 kg/s and leaves at 750 kpa subcooled by 3°c. the refrigerant enters the compressor at 200 kpa superheated by 4°c determine (a) the isentropic efficiency of the compressor, (b) the rate of heat supplied to the heated room, and (c) the cop of the heat pump. also, determine (d) the cop and rate of heat supplied to the heated room if this heat pump operated on the ideal vapor-compression cycle between the pressure limits of 200 and 800 kpa. (0.757, 4.37 kw, 5.12, 6.18, 3.91 kw)

Answers: 3

continue

Physics, 22.06.2019 18:30, zoelynn9104

Examples of states of consciousness include a. daydreaming b. dreaming during sleep c. hypnosis d. all of the above

Answers: 2

continue

Physics, 23.06.2019 01:00, bigboss3026

What is the role of the water cycle in maintaining freshwater levels in lake and rivers?

Answers: 1

continue

You know the right answer?

Trevor is pulling his younger brother in a wagon. he pulls the wagon 50 m to the corner with a force...