An airplane starts at rest and accelerates down the run way for 20 s. at the end of the run way, its velocity 80 m/s north whats it acceleration?

A rock thrown with speed 8.50 m/s and launch angle 30.0 ∘ (above the horizontal) travels a horizontal distance of d = 19.0 m before hitting the ground. from what height was the rock thrown? use the value g = 9.800 m/s2 for the free-fall acceleration.

The period T of a simple pendulum depends on the length L of the pendulum and the acceleration of gravity g (dimensions L/T^2). (a) Find a simple combination of L and g that has the dimensions of time.

A positive rod is placed to the left of sphere A, and the spheres are separated. Which best describes the spheres? Sphere A is negative and sphere B is positive because protons from sphere A are attracted to the rod and move to sphere B.

All of the following objects are moving at the same speed. which one bas the greatest kinetic energy? (remember kinetic energy depends on mass and speed) a. car b. semi tractor-trailer truck c. motorcycle d. bicycle

If an individual eats foods that do not contain any dairy and only drinks soy milk he or she most likely had a problems digesting

What two qauntities must be known to calculate the density of a sample of matter

An element's atomic number is 38. How many protons would an atom of this element have?

What's are some forms of chemical energy

True or false a liquid does not have a definite shape, but it does have a definite volume.

HOw are ferns and trees alike and different and what would survive longer without rain fern or tree