Which of the following is a physical change?

A.) sawing a piece of wood.

B.) burning a piece of wood.

C.) rust forming on an iron fence.

D.) a copper roof changing color from green to red.

Being too hot or too cold is an example of an internal distraction

9. A sports car travels on a straight road at 22.0 km/h and increases its speed to 57.0 km/h in 5.0 s. Find the car's acceleration in m/s?.

Suppose a 78 kg person is bouncing on a bathroom scale which has a force constant of 1.5 * 106 n/m. 50% part (a) what is the maximum velocity of the person, in meters per second, if the amplitude of the bounce is 0.115 cm?

A child on a playground swing makes a complete to-and-fro swing each two seconds. the frequency of the swing is

Your washer has a power of 350 watts and your dryer has a power of 1800 watts how much energy do you use to clean a load of clothes in 1 hour of washing and 1 hour of drying? A. 1.29 x 10^3 J B. 2.58 x 10^3 J C. 1.55 x 10^7 J D. 7.74 x 10^6 J

A wire carries a steady current of 2.20 A. A straight section of the wire is 0.750 m long and lies along the y axis within a uniform magnetic field, vector B = 1.70 k T.

All parts of the electromagnetic spectrum share travel at the same speed through empty space. True False

What is the mechanical advantage of the frictionless plane shown below? Inclined plane A. 0.64 B. 1.31 C. 1.4 D. 1.56

What does ice become when it absorbs enough heat energy. C. Frost. D. Liquid

Steam enters an adiabatic turbine steadily at 3 mpa and 400°c and leaves at 50 kpa and 100°c. if the power output of the turbine is 2 mw, determine (a) the isentropic efficiency of the turbine and (b) the mass flow rate of the steam flowing through