Which describes a scenario in which the Doppler affect is occurring

The volume increases

The pitch changes from low to high

The pitch changes from high to low

The volume decreases

Roger pushes a box on a 30° incline. If he applies a force of 60 newtons parallel to the incline and displaces the box 10 meters along the incline, how much work will he do on the box?

Explain how the flow of electricity differs in a battery from the type of current in a home.

A 39.5-cm-focal-length converging lens is 28.0 cm behind a diverging lens. Parallel light strikes the diverging lens. After passing through the converging lens, the light is again parallel. What is the focal length of the diverging lens?

A 0.8-m³ rigid tank contains carbon dioxide (CO₂) gas at 250 K and 100 kPa. A 500-W electric resistance heater placed in the tank is now turned on and kept on for 40 min after which the pressure of CO₂ is measured to be 175 kPa.

A person who chooses a chicken leg that provides 0.5 milligram of iron and 95 kcalories instead of 2 tablespoons of peanut butter that also provides 0.5 milligram of iron but 188 kcalories is using the principle of nutrient:a. control. b. adequacy.

Which resources does the National Park Service manage? Check all that apply. seashores monuments memorials wildlife refuges ecosystems endangered species

Why are large astronomical bodies round

What would provide specific information about the materials in the equipment used in a certain experiment

The second harmonic of a guitar string has a frequency of 120 hz. what is the length of the guitar string if the speed of the waves on the string is 110 m/s?

Which of the following processes is NOT a chemical change? A burning candles B cooking an egg C grilling a steak D mowing grass