In which natural cycle must an important gas in Earth's atmosphere be fixed before plants can use it?

a. sulfur cycle

b. carbon cycle

c. nitrogen cycle

d. oxygen cycle

The tip of a pinwheel is 0.24 m from the center. The pinwheel spins 5 times each second. What is the tangential speed of the tip of the pinwheel? 0.30 m/s 1.2 m/s 1.5 m/s 7.5 m/s

What is the relationship between sunspots and geomagnetic storms?

Jim measures the count rate of a sample of americium-241 as 120cpm. Roughly how long would it take for the count rate to fall below 4 cpm. Show your working

A car traveling at speed v takes distance d to stop after the brakes are applied. What is the stopping distance if the car is initially traveling at speed 7.0v? Assume that the acceleration due to the braking is the same in both cases.

Why are the eggs and confectioner's sugar amounts easy to work with to make 8 brownies?

Suppose that the centripetal force acting on an object in circular motion were doubled to a new value, and the object remained in a circular path with the same radius. How would the motion be affected?

2. Air at a temperature of 20 ºC passes through a pipe with a constant velocity of 40 m/s. The pipe goes through a heat exchanger in which hot gases outside the pipe heat up the air to 820 ºC.

What is the thermometer

In which natural cycle must an important gas in Earth's atmosphere be fixed before plants can use it? a. sulfur cycle b. carbon cycle c. nitrogen cycle d. oxygen cycle

Convection only occurs in what? a. gases b. fluids c. liquids d. solids