A person weighs 155 pounds. What is the person's weight in Newtons?
A. 155 N
B. 689 N
C. 39.3 N
D. 392 N
B. 689 N
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A 6.5-g iron meteor hits the earth at a speed of 295 m/s. If its kinetic energy is entirely converted to heat in the meteor, by how much will its temperature rise? The specific heat of iron is 113 cal/kg ? C°, and 1 cal = 4.186 J
A) 92.0 C° B) 57,100 C° C) 0.147 C° D) 384 C°
What is the radius of a sphere that has a density 5000 kg/m3 and a mass 6.00 kg?
A) 4.98 cm B) 1.27 m C) 6.59 cm D) 1.56 m E) 7.22 cm
Two long parallel wires placed side-by-side on a horizontal table carry identical current straight toward you. From your point of view, the magnetic field at the point exactly between the two wires
A) points up. B) points down. C) points toward you. D) points away from you. E) is zero.
High frequency alternating current is passed through a solenoid that contains a solid copper core insulated from the coils of the solenoid. Which statement is correct?
A. A copper core remains cool no matter what the frequency of the current in the solenoid is. B. The copper core remains cool because the induced emf is parallel to the solenoid axis and fluctuates rapidly. C. The copper core heats up because an emf parallel to the solenoid axis is induced in the core. D. The copper core heats up because circular currents around its axis are induced in the core. E. The copper core heats up because the electric field induced in the copper is parallel to the magnetic field produced by the solenoid.