The upper chromosphere is hot enough to emit X-rays
a. True
b. False
Indicate whether the statement is true or false
True
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A runner generates 1260 W of thermal energy. If this energy has to be removed only by evaporation, how much water does this runner lose in 15 minutes of running? The latent heat of vaporization of water is 22.6 × 105 J/kg
A) 50 g B) 500 g C) 35 g D) 350 g E) 40 g
The direction of the force on a current-carrying wire in a magnetic field is described by which of the following?
A) parallel to the current only B) parallel to the magnetic field only C) perpendicular to the current only D) perpendicular to the magnetic field only E) perpendicular to both the current and the magnetic field
A 2.0-kg mass is projected vertically upward from ground level with an initial speed of 30 m/s. The mass rises to a maximum height of 35 m above ground level. What is the change in mechanical energy of the mass caused by air resistance between the point of projection and the point of maximum height?
a. ?0.21 kJ b. ?0.47 kJ c. ?0.40 kJ d. ?0.34 kJ e. ?0.69 kJ
Why is the nightside of Mercury so much colder (relatively speaking) than the dayside?
A. Mercury is in synchronous rotation, so the far side of Mercury never sees the Sun. B. Mercury's lack of an atmosphere keeps the planet from retaining its surface heat. C. Mercury's small size lets it cool quickly. D. Mercury's magnetic field acts like a blanket on the planet's dayside.