Three examples of a heat mover are __________, __________, and __________

Fill in the blank(s) with correct word


refrigerator, air conditioner, heat pump

Physics & Space Science

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An ideal gas is allowed to undergo a free expansion. If its initial volume is V1 and its final volume is V2, the change in entropy is

A. nR ln (V2/V1) B. nRT ln (V2/V1) C. nk ln (V2/V1) D. 0 E. nR V2/V1

Physics & Space Science

How do we know that pulsars must be neutron stars?

A) Pulsars have the same upper mass limit as neutron stars do. B) No massive object, other than a neutron star, could spin as fast as we observe pulsars to spin and remain intact. C) This is only a theory that has not yet been confirmed by observations. D) We have observed massive-star supernovae produce pulsars. E) Telescopic images of pulsars and neutron stars look exactly the same.

Physics & Space Science

A flatbed truck is carrying a 20.0-kg crate up a sloping road inclined 15.0° above the horizontal. The coefficient of static friction between the crate and the bed is 0.400

What is the maximum acceleration that the truck can have if the crate is to stay in place? A) 0.625 m/s2 B) 1.25 m/s2 C) 2.50 m/s2 D) 3.16 m/s2 E) 6.33 m/s2

Physics & Space Science

A single conservative force Fx = (6.0x ? 12) N (x is in m) acts on a particle moving along the x axis. The potential energy associated with this force is assigned a value of +20 J at x = 0 . What is the potential energy at x = 3.0 m?

a. +11 J b. +29 J c. +9.0 J d. ?9.0 J e. +20 J

Physics & Space Science