A student travels from St. Louis to Indianapolis, a distance of 210 mi, in 6.0 h. The return trip over the same route takes 7.0 h. What is the average speed for

a. the first half of the trip?
b. the second half of the trip?
c. the total trip?


a. 35 mi/h
b. 30 mi/h
c. 32 mi/h

Physics & Space Science

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With respect to the earth, object 1 is moving at speed 0.80 c to the right. Object 2 is moving in the same direction at speed 0.80 c with respect to object 1. How fast is object 2 moving with respect to the earth?

A) 0.64 c B) 0.98 c C) 0.16 c D) 1.6 c E) 0.80 c

Physics & Space Science

Phil leans over the edge of a cliff and throws a rock upward at 5 m/s. Neglecting air resistance, two seconds later the rock's speed is

A) zero. B) 5 m/s. C) 10 m/s. D) 15 m/s. E) none of the above

Physics & Space Science

The symbol for the element that is the major component of steel is ______________

Fill in the blank(s) with correct word

Physics & Space Science

A car and a large truck traveling at the same speed collide head-on and stick together. Which vehicle undergoes the larger change in the magnitude of its momentum?

1.the car 2.the truck 3.the change in the magnitude of momentum is the same for both 4.impossible to determine without more information

Physics & Space Science