A far-sighted student has a near point of 1.0 m. Calculate the focal length (in cm) of the glasses needed so the near point will be normal (25 cm)
a. 72
b. 25
c. 33
d. 100
e. ?33
c
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Relative Velocity: A pickup truck moves at 25 m/s toward the east. Ahmed is standing in the back and throws a baseball in what to him is the southwest direction at 28 m/s (with respect to the truck). A person at rest on the ground would see the ball moving how fast in what direction?
What will be an ideal response?
The Earth's escape velocity is defined to be the
A) minimum orbital speed for the Moon to escape from the Earth's gravity B) minimum orbital speed for the Earth to escape from the Sun's gravity C) minimum velocity required for an object to escape the Earth's gravity D) velocity that objects are pulled toward the Earth's surface by gravity
A family goes on vacation for one week but forgets to turn off an electric fan that consumes electricity at the rate of 200 W. If the cost of electricity is 12.0¢/kW?h how much does it cost (to the nearest penny) to run the fan for the week?
What will be an ideal response?
One of the primary motivating forces behind our per capita reduction in energy use in the 1980's was _____________
a. a smaller population growth b. higher oil prices c. increased nuclear power costs d. increased domestic oil discoveries