Of all the planets known in antiquity, ________ is the hardest to observe visually
Fill in the blank(s) with correct word
Mercury
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Kinetic Energy: What is the minimum energy needed to change the speed of a 1600-kg sport utility vehicle from 15.0 m/s to 40.0 m/s?
A. 1.10 MJ B. 10.0 kJ C. 20.0 kJ D. 40.0 kJ E. 0.960 MJ
A cart has an initial velocity of 5.0 m/s to the right and a constant acceleration of 2.0 m/s2 to the right. What is the cart's displacement during the first 6.0 s of this motion?
A) 10 m B) 55 m C) 66 m D) 80 m
An object has kinetic energy when it is __________
Fill in the blank(s) with correct word
You throw a ball up in the air and hold your hand under it to catch it when it comes down. The reason why the ball stops is because
a. your hand is there: your hand exerts no force on the ball. b. your hand exerts a force on the ball perpendicular to its velocity. c. your hand exerts a force on the ball in the direction of its velocity. d. your hand exerts a force on the ball in the direction opposite to its velocity. e. your hand and the ball exert forces in the same direction on each other.