When you toss a ball upward, after the ball leaves your hand
A) the force of your hand moves it up and gradually changes direction.
B) the upward force changes direction at the top of the path.
C) we see that force and velocity are essentially the same thing.
D) none of the above
Answer: D
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Because of the period-luminosity relation for Cepheids and RR Lyrae variable stars, astronomers are able to _____
a. determine the relationship between the period of pulses and luminosity b. measure the mass of a star c. calculate a star's diameter d. determine the chemical composition of a Type I Cepheid e. narrow their study to eclipsing binary stars only
A 6.0-?F air-filled capacitor is connected across a 100-V potential source (a battery). After the battery fully charges the capacitor,
it is left connected and the capacitor is immersed in transformer oil, which has a dielectric constant of 4.5. How much additional charge flows from the battery onto the capacitor during this process? A) 1.2 mC B) 1.7 mC C) 2.1 mC D) 2.5 mC
A light-emitting diode (LED) converts electricity to approximately sinusoidal electromagnetic waves with a definite frequency f. Imagine that light from the LED creates an oscillating electric field with amplitude E0 at a certain location. If we increase the electrical power to the LED so that the oscillation amplitude is now 2E0, by what factor have we increased the power?
A. 4 times
B. 2 times
C. 
times
D. One cannot answer without more information.
An electron moves with a constant horizontal velocity of 3.0 x 106 m/s and no initial vertical velocity as it enters a deflector inside a TV tube
The electron strikes the screen after traveling 17.0 cm horizontally and 40.0 cm vertically upward with no horizontal acceleration. What is the constant vertical acceleration provided by the deflector? (The effects of gravity can be ignored.) A) 2.5 × 1014 m/s2 B) 8.3 × 102 m/s2 C) 1.4 × 104 m/s2 D) 1.2 × 1014 m/s2