1. What is work done in holding a 15kg suitcase while waiting for a bus for 15 minutes?

Human activities that do not cause an imbalance in the water cycle and the carbon cycle are considered eco-friendly. The activities that cause an imbalance in the cycles are considered not eco-friendly.

What type of energy is produced by the movement of electrons? Select one: a. Chemical energy b. Electrical energy c. Nuclear energy d. Radiant energy

It's mid-afternoon on a lovely, sunny day; it's 60°F, and the sun is 60° above the horizon. Rays from the sun strike the still surface of a shallow pond that is 20 cm deep.

If two geologic plates are sliding past each other, they are at a a. convergent boundary b. transverse boundary c. transform boundary d. continental boundary

A glass optical fiber is used to transport a light ray across a long distance. The fiber has an index of refraction of 1.540 and is submerged in glycerin, which has an index of refraction of 1.473.

When a light shines through an object it is called

A man goes from his house to office with a speed of 57km/hr and returns to the house with a speed of 83km/hr in his car. Calculate the average speed of the car.

Identify several factors in the environment that can affect physical fitness levels.

Do Brain cells act and look like skin cells? Why or why not?

A taxi hurries for 1 3/4 hours with a constant speed of 84 mph and then for another 1 hour 45 minutes with a constant speed of 24 mph. what is its average speed for the total trip?