About half of the electricity in the united states is generated using coal. true or false

A spherical gas-storage tank with an inside diameter of 8.0 m is being constructed to store gas under an internal pressure of 1.62 MPa. The tank will be constructed from steel that has a yield strength of 295 MPa. If a factor of safety of 3.

How far will a car travel, thatis moving at 20.00 m/s for 15.00 seconds?

Which of the following might you study in an ecology class? habitats food webs trophic levels all of the above

Which of the following statements is FALSE about collisions? (Consider Newton's Laws an the Conservation of Momentum.

A current of 9 a flows through an electric device with a resistance of 43. what must be the applied voltage in this particular circuit? a. 387 v b. 4.8 v c. 387 a d. 4.8 a

Kim holds a pinwheel in the air and says it can be used to model a source of energy. Identify the type of energy Kim's pinwheel models. Explain the type of energy source used.

An example of a stable system

What causes chemical weathering? a. damage caused by animals and plants c. natural acids b. ice wedging d. physical factors

1. Strzała o masie 20 g tuż po wystrzale ma prędkość 50 m/s. Oblicz pracę wykonaną przez zawodniczkę. Ile wynosi energia potencjalna sprężystości napiętej cięciwy? 2. Na trampolinę o współczynniku sprężystości k=2 kN/m stanął zawodnik o masie 80 kg.

Two small plastic spheres between them has magnitude 0.22 N. What is the charge on each sphere is one the other? Explain whether it can be determined from the information give, whether the charges are positive or negative.