Rocks solidified from molten material above ground are classified as ______________ igneous rocks
a. extrusive
b. intrusive
c. superior
d. inferior
a
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A 0.140-kg baseball is dropped from rest. It has a speed of 1.20 m/s just before it hits the ground, and it rebounds with an upward speed of 1.00 m/s. The ball is in contact with the ground for 0.0140 s
What is the average force exerted by the ground on the ball during the time of contact? A) 2.00 N upwards B) 2.00 N downwards C) 22.0 N upwards D) 22.0 N downwards E) 0.00 N
The two families of fundamental particles out of which all ordinary matter is made are
A) protons and neutrons. B) leptons and quarks. C) electrons and neutrinos. D) quarks and neutrinos. E) leptons and photons.
John throws a baseball from the outfield from shoulder height, at an initial velocity of 39.2 m/s at an initial angle of 30.0° with respect to the horizontal. The ball is in its trajectory for a total interval of 4.00 s before the third baseman catches it at an equal shoulder-height level. (Assume air resistance is negligible.) What is the ball's horizontal displacement?
a. 76.4 m c. 136 m b. 38.2 m d. zero
The reason Earth's moon does not fall into Earth is because it orbits beyond Earth's gravitational pull.
Answer the following statement true (T) or false (F)