On September 22 or 23, the noonday Sun is overhead at what latitude?
a. 0°
b. 23.5°N
c. 23.5°S
d. That of the Tropic of Cancer
a
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The graph shows how a star's orbital speed varies with time because of the gravitational tug of an orbiting planet. Based on these data, the planet's orbital period is about
A) 2 days. B) 4 days. C) 6 days. D) 50 days.
On a hard stop, the deceleration of a car is 8.00 m/s2. What force does a 50.0-kg passenger exert on the seat belt in such a stop?
What will be an ideal response?
The coefficient of linear expansion of steel is 12 × 10-6 K-1. What is the change in length of a 25-m steel bridge span when it undergoes a temperature change of 40 K from winter to summer?
A) 1.2 cm B) 1.4 cm C) 1.6 cm D) 1.8 cm E) 2.0 cm
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.