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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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
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
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