In the middle of the Crab Nebula (M1) is
a. a black hole.
b. a pulsar.
c. a quasar.
d. a white dwarf.
b
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Would you expect the wire temperature to be greater or less for a number 18 copper wire as compared to a number 14 copper wire, both conducting the same electrical current?
What will be an ideal response?
Of the following, pH ____ is the most acidic
a. 1 b. 3 c. 6 d. 7 e. 8
Lead has a latent heat of fusion of 2.32 × 104 J/kg, and a specific heat of 128 J/(kg K), and a melting point of 228°C. The ambient temperature is 16°C. A 30-g lead bullet hits a solid surface and comes to a complete stop
What would the velocity of the bullet have to be in order for it to melt completely when it hits the wall, assuming that all its kinetic energy is transformed into heat? A) 207 m/s B) 215 m/s C) 232 m/s D) 273 m/s E) 318 m/s
The force exerted on the tires of a car to directly accelerate the car along a road is exerted by the
A) engine. B) tires. C) air. D) road. E) none of the above