An object of mass 4 kg is thrown vertically upwards from ground level with an initial speed of 20 m/s. Ignore friction and use g = 10 m/s2. What is the kinetic energy of the object just before it hits the ground?
A) 800 J
B) 400 J
C) 0 J
D) 100 J
E) 200 J
A
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Describe how the gravitational forces from the Sun and the Moon compare from one side of Earth to the other.
a. The Sun exerts a stronger force on the side of Earth furthest from the Sun, and the Moon exerts a stronger force on the side nearest the Moon. b. The Sun exerts a stronger force on the side of Earth nearest the Sun, and the Moon exerts a stronger force on the side nearest the Moon. c. The Sun exerts a stronger force on the side of Earth furthest from the Sun, and the Moon exerts a stronger force on the side furthest from the Moon. d. The Sun exerts a stronger force on the side of Earth nearest the Sun, and the Moon exerts a stronger force on the side furthest from the Moon
A freely-falling watermelon falls with constant
A) velocity. B) speed. C) acceleration. D) distances each successive second.
The position of a particle as it moves along the x axis is given by x = 15e?2t m, where t is in s. What is the acceleration of the particle at t = 1.0 s?
a. 22 m/s b. 60 m/s c. 8.1 m/s d. 15 m/s e. 35 m/s
The lowest places on Earth's surface are called __________ trenches
a. plateau b. mid-oceanic c. deep-sea d. none of these