A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 24 m/s west, and the total acceleration of the car is 2.5 m/s2 53° north of west. Which of the following is correct?
a. R = 0.29 km, and the car's speed is increasing.
b. R = 0.23 km, and the car's speed is decreasing.
c. R = 0.23 km, and the car's speed is increasing.
d. R = 0.29 km, and the car's speed is decreasing.
e. R = 0.29 km, and the car's speed is constant.
a
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Standing Sound Waves: A 0.13-m string, fixed at both ends and vibrating in its n = 4 harmonic, excites a pipe that is 0.88 m long and open at both ends, into its second overtone resonance. What is the speed of transverse waves on the string? The speed of sound in air is 345 m/s.
A. 38 m/s B. 36 m/s C. 34 m/s D. 32 m/s E. 30 m/s
Which of the following particles will repel one another?
A. a neutron and a negative ion B. a proton and an electron C. a negative ion and an electron D. a neutron and a neutron
Materials in which the electrons are bound very loosely to the nuclei and can move about freely within the material are referred to as
A) insulators. B) conductors. C) semiconductors. D) superconductors. E) polar.
A person walks toward a plane mirror at 2.0 ft/s. She is approaching her image in the mirror at a speed of
A) 1.0 ft/s. B) 3.0 ft/s. C) 2.0 ft/s. D) 4.0 ft/s. E) 5.0 ft/s.