When you jump, you accelerate upward because the floor exerts an upward force on you
a. True
b. False
Indicate whether the statement is true or false
True
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Facts in the field of science
A) are absolute. B) are changeable. C) mean very little. D) are more important than theories.
How does the velocity of air moving over the top of the wing of an airplane in flight compare to the velocity of air moving under the wing?
A. The velocity under the wing is greater B. The velocity over the wing is greater C. The velocities are the same
vx is the velocity of a particle moving along the x axis as shown. If x = 2.0 m at t = 1.0 s, what is the position of the particle at t = 6.0 s?
?
?
A. ?2.0 m B. +2.0 m C. +1.0 m D. ?1.0 m E. 6.0 m
Duff states that equal masses of all substances have equal changes in internal energy when they have equal changes in temperature. Javan states that the change in internal energy is equal to a constant times the change in temperature for every ?T, no matter how large or how small ?T is, but that the constant is different for different substances. Which one, if either, is correct?
a. Neither, because the specific heat depends on the substance and may vary with temperature. b. Neither, because a change of state may involve release or absorption of latent heat. c. Neither because a substance may do work during a temperature change. d. All of the statements above are correct. e. Only statements (a) and (b) are correct.