What is the change in internal energy if 60 J of heat are released from a system and 20 J of work is done on the system Use U = Q - W.

A. - 40 J

B. 40 J

C. - 80 J

D. 80 J

Meteor Infrasound A meteor that explodes in the atmosphere creates infrasound waves that can travel multiple times around the globe. One such meteor produced infrasound waves with a wavelength of 6.5 km that propagated 8830 km in 8.47 h.

A boy throws a ball straight up in the air with an initial velocity of V+3 mls. The ball reaches a maximum height and starts towards earth. The boy catches the ball at the same height that it left his hand. How long is the ball in the air? 6. a.

What is scaler quantity

One of the following statements is incorrect, (a) The car traveled around the track at a constant velocity. (b) The car traveled around the track at a constant speed. Which statement is incorrect and why?

Vector A has a magnitude of 35.1 m/sec and a direction of 215 degrees. What are its x - and y - components?

The speed of a car is decreasing uniformly from 35 m/s to 15 m/s in 4 s the magnitude of the car's acceleration is

An object that has kinetic energy must what?

A student measures the length and width of a rectangle to be 40.7 cm and 0.599 cm, respectively. Wanting to find the area (in cm2) of this rectangle, the student multiplies on a calculator and obtains a result of 24.3793.

A red apple is illuminated by green light. what color will the apple appear as?

Explain why a roller coaster's second hill cannot be taller than the first hill.