An autographed baseball rolls off of a 0.91 m high desk and strikes the floor 0.84 m away from the desk. How fast was it rolling on the desk before it fell off? The acceleration of gravity is 9.81 m/s2.

Iodine molecules separates into atoms after absorbing light of 450 nm. If one quantum of radiation of such light is absorbed by each molecule, calculate the kinetic energy of the iodine atoms if the bonding energy is 3.984x10-19 J.

One relationship between organisms is that of predator-prey. Which of the following is the best description of a predator?

in a thermal power plant, heat from the flue gases is recovered in (A) chimney (B) de-super heater (C) economizer (D) condenser

Hobbyists build a compressed air powered cannon which is able to launch a pumpkin a horizontal distance of 2700 ft.

What do wind turbines, hydroelectric dams, and ethanol plants have in common? A. All produce electrical current with pollution B. All use generators to produce electrical current C. All convert gravitational potential energy to electrical current D.

What is a stack of membranes that packages chemicals

Under what condition (s) will an object be in equilibrium? Notice that equilibrium in physics has a broader definition. (A) Only if it is moving with constant velocity. (B) Only if it is at rest.

If a pressure gauge measure an increase in 3*10^ (5) Pa on an area of 0.7 m^2, calculate the increase in the force applied to the area?

Which of the following is an example of potential rather than kinetic energy? a. water rushing over Niagara Falls b. a molecule of glucose c. a crawling beetle foraging for food d. light flashes emitted by a firefly

If a force of 15 newtons [N] is applied to a surface and the pressure is measured as 4,000 pascals [Pa], what is the area of the surface in units of square milimeters [mm2 ]?