What do water, aluminum, redwood trees, and valley quail all in common?

Two people use a ramp to move a heavy box on to a truck. The box weighs 750 N the mechanical advantage of the ramp is 4. How much effort is needed to move the box

Which electromagnetic wave has the lowest frequencies (less than 3*109 hertz) ? A. microwaves B. visible light C. radio waves D. gamma rays

Which of theese are symptoms of bipolar disorder? A. Changes in thoughts, feelings, or behaviors B. Losing control of reality C. Fears that that are difficult to control D. Extreme mood swings and changes in energy levels and behavior

A 10 kg lawn mower is pushed along by a force applied at a 20 degree angle to the horizontal. If a the mower accelerates at 3.4 m/s^2, what is this force?

A plane can fly 300 miles in the same time as it takes a car to go 150 miles. if the car travels 90 mph slower than the plane, find the speed of the plane.

A 1,492.3-kg airplane travels down the runway. Each of its four engines provides a force of 1,447.5 N. Find the acceleration of the airplane, in m/s2. (Ignore friction.)

A 0.42 kg football is thrown with a velocity of 17 m/s to the right. A stationary receiver catches the ball and brings it to rest in 0.017 S. What is the force exerted on the receiver? Answer in units of N

When Little Albert was conditioned to be afraid of the white mouse, he also became afraid of stuffed animals, other furry things, and even Santa Claus. These learned behaviors demonstrated the phenomenon of Select one: A. extinction X B.

An object floats in liquid of density 1.2*10kgm/3 with one quarter of its volume above the liquid surface. Determine the density of the object

In cloud formation, water vapor turns into water droplets which get bigger and bigger until it rains. This will cause the temperature of the air in the clouds to: a. get warmer. b. get cooler. c.