A child pulls on a wagon with a force of 75N If the wagon moves a total of 42m in 3.1min what is the average power delivered by the child?
A) 21 W B) 22 W C) 26 W D) 17 W
D
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The downslope movement of surface materials as a result of gravity and of the agents that cause such movement is called
a. erosion. b. gradation. c. landslides. d. none of these.
A 620-g object traveling at 2.1 m/s collides head-on with a 320-g object traveling in the opposite direction at 3.8 m/s. If the collision is perfectly elastic, what is the change in the kinetic energy of the 620-g object?
A) It loses 0.23 J. B) It gains 0.69 J. C) It loses 0.47 J. D) It loses 1.4 J. E) The energy of the object is unchanged.
An umbrella has a tendency to move upward when it is windy principally because
1) moving air over the curved surface produces reduced pressure against its top. 2) air moves up into the "bowl" and pushes upward with increased pressure. 3) buoyancy increases with increasing wind speed. 4) the umbrella is simply pushed upward by the wind. This effect was first accurately described by 5) Galileo. 6) Newton. 7) Bernoulli. 8) Einstein. 9) Archimedes.
Sunspots are cooler than the surrounding region of the Sun's surface
Indicate whether the statement is true or false