A 5.00-g lead BB moving at 44.0 m/s penetrates a wood block and comes to rest inside the block. If half of its kinetic energy is absorbed by the BB,
what is the change in the temperature of the BB? The specific heat of lead is 128 J/kg ? K.
A) 0.940 K
B) 1.10 K
C) 1.26 K
D) 2.78 K
E) 3.78 K
E
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The coil of a generator rotates through one complete turn in a uniform magnetic field 50. times every second. When this generator is connected to an external load, the current through the load reverses directions
A) 25 times every second. B) 100 times every second. C) 75 times every second. D) 50 times every second. E) 200 times every second.
What percentage of the mass of the solar nebula consisted of elements other than hydrogen and helium?
A) 20 percent B) 0.1 percent C) 80 percent D) 0 percent E) 2 percent
Which object below has the lowest resistance? All three have length L and are made out of the same material
The pressure inside a commercial airliner is maintained at 1.00 atm (105 Pa). What is the net outward force exerted on a 1.0 m × 2.0 m cabin door if the outside pressure is 0.40 atm?
a. 120,000 N c. 1200 N b. 12,000 N d. 120 N