A 4.00-kg block slides down a frictionless inclined plane with an acceleration 3.00 m/s2. What is the angle of the incline above horizontal?

A) 35.3°
B) 45.2°
C) 17.8°
D) 23.6°
E) 53.7°


C

Physics & Space Science

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The frequency separating audible waves and ultrasonic waves is considered to be 15.0 kHz. What wavelength in air at room temperature is associated with this frequency? (Assume the speed of sound to be 225 m/s.)

a. 1.50 cm b. 33.8 cm c. 22.5 cm d. 33.8 cm e. 33.8 cm

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In Hubble's "tuning fork," spirals are on the parallel branches

Indicate whether the statement is true or false

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On the average during good weather, the Earth has a positive surface charge. Which is the usual direction of the Earth's electric field at the Earth's surface?

a. down b. up c. some direction parallel to the Earth's surface d. north.

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Estimation: Estimate the number of times an average person's heart beats in a lifetime. Assume the average heart rate is 69 beats/min and a life span of 75 years.

A. 3 × 109 beats B. 3 × 108 beats C. 3 × 1010 beats D. 3 × 107 beats

Physics & Space Science