A 70.0-kg man jumps 1.00 m down onto a concrete walkway. His downward motion stops in 0.04 seconds. If he forgets to bend his knees, what force is transmitted to his leg bones?
a. 700 N
c. 8000 N
b. 4000 N
d. 16,000 N
C
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Both Jupiter and Saturn
a. have liquid metallic hydrogen in their interiors. b. have rings. c. emit more energy than they absorb from the Sun. d. have belt and zone circulation. e. All of the other choices are correct.
Shear Modulus: A 25-kg television set rests on four rubber pads that are on the floor, each one having a height of 1.0 cm and a radius of 0.60 cm. A horizontal force is applied to the television set. When the pads are just at the point of sliding over the floor, how far has the television set moved sideways due to the deformation of the pads? The coefficient of static friction between the rubber and the floor is 1.0 and the shear modulus of these rubber pads is 2.6 × 106 Pa.
A. 16 mm B. 8.4 mm C. 4.2 mm D. 2.1 mm E. 1.1 mm
First Law of Thermodynamics: A fluid in an insulated, flexible bottle is heated by a high resistance wire and expands. If 9.0 kJ of heat is applied to the system and it does 5.0 kJ of work, how much does the internal (thermal) energy of the fluid change?
A. 4.0 kJ B. 14 kJ C. -4.0 kJ D. 45 kJ
What kind of civilization can life on Earth currently be classified as?
A) Type II B) Type III C) Type IV D) Type I