A Ferris wheel, rotating initially at an angular speed of 0.50 rad/s, accelerates over a 7.0-s interval at a rate of 0.040 rad/s2 . What is its angular speed after this 7.0-s interval?
a. 0.20 rad/s
b. 0.30 rad/s
c. 0.46 rad/s
d. 0.78 rad/s
d
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The part of an electron microscope that plays the same role as the lenses do in an optical microscope is
A) the vacuum chamber. B) the coils. C) the cathode. D) the anode. E) the deflector plates.
In a mass spectrometer, a single-charged particle (charge e) has a speed of 1.0 × 106 m/s and enters a uniform magnetic field of 0.20 T. The radius of the circular orbit is 0.020 m. What is the mass of the particle?
A) 3.2 × 10-28 kg B) 6.4 × 10-28 kg C) 1.7 × 10-27 kg D) 4.5 × 10-27 kg E) 3.1 × 10-31 kg
A pole-vaulter clears 5.00 m. With what speed does he strike the mat in the landing area?
a. 2.70 m/s c. 10.8 m/s b. 9.90 m/s d. 21.6 m/s
A 550-Hz whistle is moved toward a listener at a speed of 25.0 m/s. At the same time, the listener moves at a speed of 35.0 m/s in a direction away from the whistle. What is the apparent frequency heard by the listener? (The speed of sound is 340 m/s.)
a. 510 Hz b. 533 Hz c. 655 Hz d. 460 Hz e. 594 Hz