A force of 5.0 N is applied to a 20-kg mass on a horizontal frictionless surface. As the speed of the mass increases at a constant acceleration, the power delivered to it by the force:
a. remains the same.
c. decreases.
b. increases.
d. doubles every 4.0 seconds.
B
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Why does the burning of fossil fuels increase the greenhouse effect on Earth?
A) The heat from the flames warms the planet. B) Burning fossil fuels releases carbon dioxide into the atmosphere. C) Burning fossil fuels depletes the amount of ozone, thereby warming the planet. D) Burning fossil fuels produces infrared light, which is then trapped by existing greenhouse gases.
Spreading centers occur along
A) trenches. B) transform faults. C) mid-ocean ridges. D) the northern and western margins of the Juan de Fuca Plate.
Which of the following features of a telescope determines its light-gathering power?
a. the focal length of the primary lens b. the focal length of the eyepiece c. the diameter of the primary lens d. length of the telescope tube e. None of the other choices are correct.
A proton moving along the x axis has an initial velocity of 4.0 × 106 m/s and a constant acceleration of 6.0 × 1012 m/s2. What is the velocity of the proton after it has traveled a distance of 80 cm?
A. 5.1 × 106 m/s B. 6.3 × 106 m/s C. 4.8 × 106 m/s D. 3.9 × 106 m/s E. 2.9 × 106 m/s