A car on a roller coaster starts at zero speed at an elevation above the ground of 26 m. It coasts down a slope, and then climbs a hill. The top of the hill is at an elevation of 16 m
What is the speed of the car at the top of the hill? Neglect any frictional effects. A)
14 m/s
B)
18 m/s
C)
10 m/s
D)
9 m/s
E)
6 m/s
A
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Wien's Law: What is the wavelength of the most intense light emitted by a giant star of surface temperature 5000 K? The constant in Wien's law is 0.00290 m ? K.
A. 576 nm B. 578 nm C. 580 nm D. 582 nm
A 10.0-?F capacitor is plugged into a 110 V rms 60.0-Hz voltage source, with an ammeter in series. What is the rms value of the current through the capacitor?
A. 0.202 A (rms) B. 0.415 A (rms) C. 0.626 A (rms) D. 0.838 A (rms) E. 0.066 A (rms)
An airplane is flying at a speed of 2.00 × 102 m/s in level flight at an altitude of 8.00 × 102 m. A package is to be dropped from the airplane to land on a target on the ground. Ignore air resistance
(a) At what horizontal distance away from the target should the package be released so that it lands on the target? (b) In what direction relative to the horizontal will the package be traveling when it hits the ground?
Two observers will always agree on
A. the speed of light. B. the mass of cosmic ray muons. C. the charge of cosmic ray muons. D. the lifetime of cosmic ray muons.