A car travels northwest for 2 hours and covers a distance of 90

miles. What is the average velocity of the car?

a

36 mi/h northwest

b

42 mi/h northwest

C 40 mi/h northwest

d 45 mi/h northwest

Since our number system is on a base-10 notation, we do not need to learn scientific notation.

A laser emits light at power 6.20 mW and wavelength 633 nm. The laser beam is focused (narrowed) until its diameter matches the 1080 nm diameter of a sphere placed in its path. The sphere is perfectly absorbing and has density 5.00 * 103 kg/m3.

In the summer, why does Alaska have longer days than Florida? A. Alaska is a little bit closer to the Sun. B. Alaska experiences much greater precession. C. Alaska is a much larger area, so it receives more light. D.

A person in a kayak starts paddling, and it accelerates from 0 to 0.61 m/s in a distance of 0.39 m. If the combined mass of the person and the kayak is 74 kg, what is the magnitude of the net force acting on the kayak?

1. In which direction can a force be exerted on an object? A. Any direction B. Up, down, left, right C. Depends on the acceleration of the object 2. Based on Newton's first law of motion, which of the following is true? A.

Identify the scenario below as to whether they increase, decrease, or not change the frequency in which a string vibrates and thus change its pitch. Assume that no other changes are happening. 1. Tightening a string for greater tension 2.

Explain what each of the following scientists contribute to the atomic theory

A fully charged parallel-plate capacitor remains connected to a battery while a dielectric is slid between the plates. Do the following quantities increase, decrease, or stay the same? Select one or more: a. delta V increases b.

Energy is observed in two basic forms: potential and kinetic. Which of the following correctly matches these forms with a source of energy? a. the heat released from a living organism: potential energy b.

What should you do when operating a boat in large waves and high wind?