Three hundred joules of heat are added to a system. The system uses 140 joules to do work.

By how much did the internal energy of the system change?

a 140 J

b 160 J

c 240 J

d 440 J

A hiker leaves her camp and walks 3.5 km in a direction of 55° south of west to the lake. after a short rest at the lake, she hikes 2.7 km in a direction of 16° east of south to the scenic overlook.

Which of the following best describes a magnetic field? a region around a magnet in which you can measure magnetic forces. a measure of the length of a magnet. the force that pushes two magnets away from each other.

Calculate the efficiency of an engine in a power plant operating between 40 ° c and 320 ° c. remember that the efficiency is a decimal number less than 1.

Your friend, who is age 15 and has a resting heart rate of 70, wishes to start a jogging program. What would you suggest as a proper starting target heart rate? 138 115 178 155

A remote-controlled car runs on a 9V battery. If a 1.5A current is running through the circuit, what resistance is the car providing?

A Blu-ray disc is approximately 11 centimeters in diameter. The drive motor of a Blu-ray player is able to rotate up to 10,000 revolutions per minute. (a) Find the maximum angular speed (in radians per second) of a Blu-ray disc as it rotates

A body has translatory motion if it moves along a

What is Nothing. (sorry i have been wondering this for a very long time)

What is the weight of a 15kg dog on earth?

Identify the scenario below as to whether they increase, decrease, or not change the frequency in which a string vibrates and thus change its pitch. Assume that no other changes are happening. 1. Tightening a string for greater tension 2.