A hill is 150 m long and makes an angle of 12° with the horizontal. As a 60-kg jogger runs up the hill, how much work does gravity do on the jogger?
a. 8.82E+4 J
b. 1.83E+4 J
c. ?1.83E+4 J
d. 8.63E+4 J
e. zero
c
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A 10-kg block is pushed across a horizontal surface with a horizontal force of 20 N against a friction force of 10 N. The acceleration of the block is
A) 1 m/s2. B) 2 m/s2. C) 5 m/s2. D) 10 m/s2. E) none of the above
Rocks formed from consolidated sediment deposited in layers are known as _____________ rocks
a. crystalized b. foliated c. igneous d. sedimentary
A 20 solar mass star will stay on the main sequence for 10 million years, yet its iron core can exist for only a:
A) day. B) week. C) month. D) year. E) century.
A reflection nebula is caused by:
A) starlight reflected off of a surface. B) sunlight reflected off of a surface. C) sunlight scattered by dust particles. D) starlight scattered by dust particles. E) emission by ionized gas.