The mat of a trampoline is held by 32 springs, each having a spring constant of 5000 N/m. A person with a mass of 40.0 kg jumps from a platform 1.93 m high onto the trampoline. Determine the stretch of each of the springs
9.97 cm
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A 10-kg rock and a 20-kg rock are thrown upward with the same initial speed v0 and experience no significant air resistance. If the 10-kg rock reaches a maximum height h, what maximum height will the 20-kg ball reach?
A) h/4 B) h/2 C) 2h D) h E) 4h
A 120-V rms signal at 60 Hz is applied across a series combination of a 30-mH inductor and a 100-? resistor. What is the rms value of the current in this circuit?
A) 1.2 A B) 1.8 A C) 0.80 A D) 1.6 A E) 1.4 A
A series circuit has a 100-? resistor, 2.00-mH inductor and a 4.00-?F capacitor connected across a 120-V rms ac source at 1000/? Hz. What is the power dissipated by the circuit?
A) 18.6 W B) 180 W C) 91.8 W D) 184 W E) 58.4 W
The force per unit area exerted by an electromagnetic wave is called the
A) energy density. B) power. C) intensity. D) radiation pressure. E) radiation field.