Two projectiles are launched at 100 m/s, the angle of elevation for the first being 30° and for the second, 60°. Which of the following statements is false?
a. Both projectiles have the same acceleration while in flight.
b. The second projectile has the lower speed at maximum altitude.
c. Both projectiles have the same range.
d. All of the above statements are false.
D
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Which of the fields are physically impossible and why?
A. This field violates the Ampere-Maxwell law. B. This field violates Gauss’s law for the magnetic field. C. The field violates both of the above laws. D. This field is physically possible.
By studying distant galaxies in the 1920s, Hubble made the following important discovery that led us to conclude that the universe is expanding.
A) All galaxies contain billions of stars, and all galaxies have spiral shapes. B) All galaxies were born at the same time, and all will die at the same time. C) All galaxies outside the Local Group are moving away from us, and the farther away they are, the faster they're going. D) All galaxies outside the Local Group are orbiting the Local Group. E) Galaxies are in motion throughout the universe, with about equal numbers moving toward us and away from us.
As long as an object is not gaining or losing mass, a net force on the object will cause a change in
A) acceleration. B) direction. C) weight. D) speed. E) velocity.
A car travels around an oval racetrack at constant speed. The car is accelerating
a.
at all points except B and D.
b.
at all points except A and C.
c.
at all points except A, B, C, and D.
d.
everywhere, including points A, B, C, and D.
e.
nowhere, because it is traveling at constant speed.