A projectile leaves the ground at 150 m/s and reaches a maximum height of 0.57 km. If there was no air, at what angle above the horizontal did it leave the ground?
What will be an ideal response?
45°
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What physical feature of Mars is atypical compared with the other terrestrial planets?
A) its size
B) its atmospheric content
C) its surface composition
D) its density
E) its rotation rate
How many arcseconds are in one arcminute?
A) 10,000 B) 60 C) 360 D) 100 E) 3600
A 1.2-m high by 2.8-m wide vertical rectangular gate is used to control the flow of water from a reservoir to a grinding mill. A frictionless hinge runs along the bottom of the gate. The minimum force acting normal to and at the very top of the gate needed to hold the gate shut if the water is at the very top of the gate is nearest:
(A) 6590 N (B) 9800 N (C) 10 000 N (D) 13 300 N
This figure shows an airplane traveling east to west along Earth's equator at the same speed that Earth rotates from west to east. People on Earth would, of course, simply see the airplane fly westward at 1,670 km/hr. What is the significance of the difference in viewpoints between people on Earth and people on the Moon?
A) It shows that motion is relative not absolute. B) It shows that you can get a wrong answer if you don't view the situation from the correct perspective. C) It shows that the airplane is traveling in a direction opposite to Earth's rotation. D) It shows that airplanes can move quite fast if you view them from the right place.