A European sports car dealer claims that his product will accelerate at a constant rate from rest to a speed of 100 km/hr in 8.00 s. What is the speed after the first 5.00 s of acceleration? (Hint: First convert the speed to m/s.)
a. 34.7 m/s
c. 23.1 m/s
b. 44.4 m/s
d. 17.4 m/s
D
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What wavelength monochromatic source in the visible region (390 to 710 nm) can be used to constructively reflect off a soap film (n = 1.46) in air if the film is 288 nm thick?
a. 561 nm c. 587 nm b. 480 nm d. 467 nm
If we imagine that 1 in 10 million stars would eventually give rise to a civilization on an orbiting planet and assuming that there are 100 billion stars in our Milky Way galaxy, how often should a civilization randomly appear over a 5 billion year
period? A) once every 50 million years B) once every 50,000 years C) once every 500,000 years D) once every 5 million years
A car is moving with a speed of 32.0 m/s. The driver sees an accident ahead and slams on the brakes, giving the car a deceleration of 3.50 m/s2. How far does the car travel after the driver put on the brakes before it comes to a stop?
A) 4.57 m B) 9.14 m C) 112 m D) 146 m E) 292 m
Lightning is dangerous to humans because lightning strokes
a. carry large currents c. have no resistance b. have high voltages d. fry whatever they hit