A walker walks 30 m from the origin toward the EAST to point A. She then walks from point A 20 m more toward the WEST to point B. The walker's total displacement form the origin is
A. 50 m toward the EAST.
B. 30 m toward the WEST.
C. 20 m toward the WEST.
D. 10 m toward the EAST.
E. 10 m toward the WEST.
D. 10 m toward the EAST.
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When an astronomer measures the redshift to a distant galaxy, exactly what physical process is being measured?
What will be an ideal response?
Conduction: A glass tea kettle containing 500 g of water is on the stove. The portion of the tea kettle that is in contact with the heating element has an area of 0.090 m2 and is 1.5 mm thick. At a certain moment, the temperature of the water is 75°C, and it is rising at the rate of 3 C° per minute. What is the temperature of the outside surface of the bottom of the tea kettle? Neglect the heat capacity of the kettle, and assume that the inner surface of the kettle is at the same temperature as the water inside. The thermal conductivity of glass is 0.840 W/m ? K and the specific heat of water is 4186 J/kg ? K.
A. 39°C B. 92°C C. 120°C D. 86°C E. 77°C
The coefficient of static friction for the tires of a race car is 0.950 and the coefficient of kinetic friction is 0.800. The car is on a level circular track of 50.0 m radius on a planet where 
compared to Earth's 
. If the car is to be able to travel at the same speed on the planet as on Earth, the radius of the track on the
planet must be ____ times as large as the radius of the track on Earth. A. 0.250 B. 0.500 C. 1.00 D. 2.00 E. 4.00
Supernovae are one of the most extreme events in the known universe. They are caused by
A) the implosion of a white dwarf, which has run out of all its fuel. B) a supermassive supergiant star undergoing a massive nuclear chain reaction. C) the collapse of a supermassive supergiant star. D) Any of the above.