A crate is sitting in the center of a flatbed truck. As the truck accelerates to the east, the crate moves with it, not sliding on the bed of the truck. In what direction is the friction force exerted by the bed of the truck on the crate?
1.to the west
2.to the east
3.There is no friction force, because the crate is not sliding.
2
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Light is a transverse wave
Indicate whether the statement is true or false
Force on a Moving Charge: An electron moves with a speed of 8.0 × 106 m/s along the +x-axis. It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the xy-plane. Calculate the magnitude of the acceleration of the electron. (e = 1.60 × 10-19 C, me1 = 9.11 × 10-31 kg)
A. 1.3 × 1018 m/s2 B. 3.0 × 1018 m/s2 C. 1.3 × 10-18 m/s2 D. 3.0 × 10-18 m/s2 E. 0 m/s2
Two 0.95-kg masses, one aluminum and one tin, both at 80.0°C, are placed in 1.00 kg of water at 20.0°C. What is the equilibrium temperature of the system? The specific heats of aluminum and tin are 900 J/kg/°C and 227 J/kg/°C, respectively
a. 32.2 °C b. 27.1 °C c. 13.2 °C d. 40.3 °C
In this figure the shape of a plucked guitar string (a) is the superposition of the first five harmonics (b-f). What does the listener hear when a guitar string is plucked?
a. The first harmonic because it has the greatest amplitude. b. The fifth harmonic because our ears are most sensitive to high frequencies. c. A blend of all of the harmonics shown in the figure because all of them produce sound.