Which of the following is an expressipn of velocity?

O

A. 55 mi north

O B. 55 mph

O C. 90 km

O

D. 90 km/h north

Why must you operate the exhaust blower before starting a boat's inboard gasoline engine?

A runner hopes to complete the 10,000-m run in less than 30.0 min. after running at constant speed for exactly 26.0 min, there are still 1500 m to go.

An astronaut carrying a camera in space finds herselfdrifting away from a space shuttle after her tetherbecomes unfastened. If she has no propulsion device, what should she do to move back to the shuttle?

Where are the longest continuous mountain ranges on Earth located?

How much energy is needed to increase the temperature of 755 g of iron from 283 K to 403 K?

Which of the following is an example of applied research?

A Cadillac Escalade has a mass of 2,569.6 kg, if it accelerates at 4.65 m/s^2 what is the net force on the car?

If you are trying to balance a seesaw and you have a higher mass on the left, should the mass on the right be placed at a greater distance or lower distance to balance it? Why?

A car travels 300 km in the first 3 hours of a trip. Then it hits traffic and travels only 60 km during the last hour. What is the average speed of the car? a.) 180 km/h b.) 100 km/h c.) 90 km/h d.) 120 km/h

What is the purpose of using a wedge? A. separates objects B. keeps objects together C. allows you to exert force over a distance