What is the period of Earth spinning on its axis? what is its frequency?

A boat is able to move through still water at 20 m/s. It makes a round trip to a town 10 km upstream. If the river flows at 5m/s, what is the time required for this round trip? (give your answer in seconds)

Which is a balanced equation for this reaction? A. Fe + H2SO4? Fe2 (SO4) 3 + H2 B. 2Fe + H2SO4? Fe2 (SO4) 3 + H2 C. Fe + 3H2SO4? Fe2 (SO4) 3 + 3H2 D. 2Fe + 3H2SO4? Fe2 (SO4) 3 + 3H2

Mohs scale is used in describing which characteristic?

How is constant velocity indicated on a motion map

Your grandfather clock's pendulum has a length of 0.9930 m. if the clock gains 80 seconds per day, should you increase or decrease the length of the pendulum? increase decrease do neither; the clock cannot be fixed in this manner. by how much? mm

Which of the following is not shorthand to describe one of the three types of ecological relationships? +/+ -/+ +/0 -/0

Which is a characteristic of an electromagnetic wave?

What does the ozone layer absorb? a. Microwaves c. UV radiation b. X-rays d. Infra-red radiation

An object is undergoing shm with period 0.900 s and amplitude 0.320 m. at t = 0 the object is at x = 0.320 m and is instantaneously at rest. calculate the time it takes the object to go (a) from x = 0.320 m to x = 0.160 m and (b) from x = 0.

Your friend states in a report that the average time required to circle a 1.0-mi track was 49.325 s. This was measured by timing 10 laps using a stopwatch with a precision of 0.01 s. Do you believe his results are reliable? Explain.