Combining two sounds of equal intensity will give a sound level 3 dB higher than the sound level due to just one of them
Indicate whether the statement is true or false
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A proton moving at 3 × 10^4 m/s is projected at an angle of 30° above a horizontal plane. If an electric field of 400 N/C is directed downwards, how long does it take the proton to return to the horizontal plane? (HINT: Ignore gravity.) [mProton = 1.67 × 10^?27 kg, qProton = +1.6 × 10^?19 C.]
What is the speed of a proton that has been accelerated from rest through a potential difference of 4.0 kV?
a. 1.1 × 10^6 m/s b. 9.8 × 10^5 m/s c. 8.8 × 10^5 m/s d. 1.2 × 10^6 m/s e. 6.2 × 10^5 m/s
A 35 mm camera equipped with a 45 mm focal length lens is used to photograph a tree 15 m tall. The aperture of the lens is set at f/2. The aperture diameter at f/2, in mm, is closest to:
A) 23 B) 14 C) 18 D) 27 E) 32
Impulse: A very small 51-g steel ball is released from rest and falls vertically onto a steel plate. The ball strikes the plate and is in contact with it for 0.50 ms. The ball rebounds elastically and returns to its original height. The total time interval for a round trip is 3.00 s. What is the magnitude of the average force exerted on the ball by the plate during contact with the plate?
A. 3000 N B. 1500 N C. 2490 N D. 2000 N E. 3500 N