A car travels at 50.0 km/hr for 2.00 hours. It then travels an additional distance of 40.0 km in 1.00 hour. The average speed of the car for the entire trip is
A. 61.0 km/hr.
B. 57.1 km/hr.
C. 53.3 km/hr.
D. 46.7 km/hr.
E. 30.0 km/hr.
D. 46.7 km/hr.
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Sunspots
a. are hotter than their surroundings. b. are regions where material is rising from below the photosphere. c. show the Zeeman effect indicating the presence of strong magnetic fields. d. produce spicules. e. are generally found near the poles of the Sun during sunspot maximum.
A brick slides across a horizontal rough surface and eventually comes to a stop. What happened to the kinetic energy of the brick?
A. It was converted to other energy forms, mostly heat B. Nothing; it is still in the brick but is now called potential energy C. It was converted to a potential energy of friction D. It was simply destroyed in the process of stopping
There are positive and negative magnetic charges, analogous to positive and negative electric charges
a. True b. False Indicate whether the statement is true or false
An electron has a 2% probability of tunneling through a rectangular potential barrier. If this same energy electron impinged upon another barrier of the same height but twice the thickness, what would be its probability of tunneling?
A) 4% B) 2% C) 1% D) 0.04% E) 0.004%