An automobile (m = 1.00 × 10^3 kg) is driven into a brick wall in a safety test. The bumper behaves like a spring (k = 5.00 × 10^6 N/m), and is observed to compress a distance of 3.16 cm as the car is brought to rest. What was the initial speed of the automobile?
2.23 m/s
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An object's momentum is equal to its ____
a. acceleration multiplied by its mass b. acceleration divided by its weight c. velocity multiplied by the gravitational constant d. velocity multiplied by its mass e. velocity divided by its weight
When the velocity and acceleration of an object have opposite signs, the speed of the object increases
Indicate whether the statement is true or false
A ball is rolled horizontally off a table with an initial speed of 0.18 m/s. A stopwatch measures the ball's trajectory time from table to the floor to be 0.30 s. How far away from the table does the ball land? Note: g = 9.8 m/s2 and air resistance is negligible
a. 0.054 m c. 1.2 m b. 0.072 m d. 1.9 m
The most important acid involved in chemical weathering is
a. carbonic acid. b. sulfuric acid. c. hydrochloric acid. d. none of these.