What is the change in internal energy if 50 J of heat are released from a system, and the system does 80 J of work on its surroundings?

Calculate the change in entropy as 0.3071 kg of ice at 273.15 K melts. (The latent heat of fusion of water is 333000 J / kg)

Why can blue light and yellow light combine to produce white light? a. because blue, yellow, and white are primary colors. b. they absorb each other s wavelengths. c. they are complementary colors of light. d. they are both primary colors of light.

Why was the theory of plate tectonics met with challenges from other scientists when it was first proposed? a. there was no evidence to support it b. the scientist who proposed it was obviously biased c.

A lion is stalking an antelope that is running at a speed of 7m/s. At the moment the antelope passes the lion, she gives chase and accelerates at a rate of 5m/s^2. How long will it take the lion to catch up to the antelope?

What effect does the sun have on Earth's tides? A. The pull of the sun cancels the pull of the moon when they are on opposite sides of Earth, causing lower high tides. B.

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.

Explain what each of the following scientists contribute to the atomic theory

A fully charged parallel-plate capacitor remains connected to a battery while a dielectric is slid between the plates. Do the following quantities increase, decrease, or stay the same? Select one or more: a. delta V increases b.

Energy is observed in two basic forms: potential and kinetic. Which of the following correctly matches these forms with a source of energy? a. the heat released from a living organism: potential energy b.

What should you do when operating a boat in large waves and high wind?