What is the change in internal energy if a gas loses 80 joules of heat, and then does 60 joules of work?

What causes the formation of ocean currents?

In which situation is the acceleration of a car negative? question 5 options: a)the velocity of a car was 75 km/hr over 4 hours. b)the velocity of a car reduced from 50 km/hr over one minute. c)the velocity of a car increased from 40 km.h to 75 km/h over 15 minutes. d)the velocity of a car was 45 km/hr at 2: 00pm and at 4: 00pm its velocity was 85 km/ht.

What are some important factors to consider when choosing a warm-up before your workout?