Which of the following pairs of forces are an action-reaction pair according to Newton’s 3rd law?
A. The push of the road on the car and the push of the car on the road
B. The weight of an object and the normal force on the object
C. The air resistance on a sky diver and the weight of the sky diver
D. The frictional force acting on an object and the force used to push an object
A. The push of the road on the car and the push of the car on the road
You might also like to view...
If the outer air temperature in Problem 1.11 is –2°C, calculate the convection heat transfer coefficient between the outer surface of the window and the air assuming radiation is negligible.
GIVEN
• Window: 1 m by 3 m
• Thickness (L) = 7 mm = 0.007 m
• Surface temperatures
? Inner (Ti) = 20°C
? outer (To) = 17°C
• The rate of heat loss = 1040 W (from the solution to Problem 1.11)
• The outside air temperature = –2°C
FIND
• The convective heat transfer coefficient at the outer surface of the window ( h c)
ASSUMPTIONS
• The system is in steady state and radiative loss through the window is negligible
SKETCH
Under which circumstances can you be sure that the thermal pressure within a gas cloud is increasing?
A) The cloud's temperature and density are both increasing. B) The cloud's temperature is increasing and its density is decreasing. C) The cloud's temperature and density are both decreasing. D) The cloud's temperature is decreasing and its density is increasing. E) It is impossible to say.
When light is either reflected or refracted, the quantity that does not change in either process is its
a. direction of travel. b. dispersion. c. frequency. d. speed. e. wavelength.
What is the rotational inertia of a solid iron disk of mass 41.0 kg with a thickness of 5.00 cm and radius of 30.0 cm, about an axis through the center and perpendicular to it?
A. 0.980 kg 
B. 0.761 kg
C. 1.85 kg
D. 2.29 kg