A blob of clay, mass M, is dropped onto a spring from a height h above the end of the spring. If the spring compresses an amount d as the blob comes to rest, what is the spring constant?

a.

b.

c.

d.


d.

Physics & Space Science

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In hot-work, a metal is deformed at temperatures that are either above the ___________temperature, or above 50 % of the absolute melting temperature.

Fill in the blank(s) with the appropriate word(s).

Physics & Space Science

A hot pizza contains

a. heat. b. internal energy. c. temperature. d. work. e. none of the above.

Physics & Space Science

A policeman in a stationary car measures the speed of approaching cars by means of an ultrasonic device that emits a sound with a frequency of 39.6 kHz

A car is approaching him at a speed of 35.0 m/s. The wave is reflected by the car and interferes with the emitted sound producing beats. What is the frequency of the beats when the speed of sound in air is 343 m/s? A) 5000 Hz B) 4500 Hz C) 8490 Hz D) 9000 Hz E) 4250 Hz

Physics & Space Science

The beam of electrons that hits the screen of an oscilloscope is moved up and down by:

a. varying the electron's charge. b. electrical charges on deflecting plates above and below the beam. c. gravity. d. a phosphorescent coating.

Physics & Space Science