How much energy (in kW-h) does a 900 Watt stove use in a week if it is used for 1.5 hours each day?

A stone tumbles into a mine shaft and strikes bottom after falling 4.2 seconds. How deep is the mine shaft?

The law of conservation of matter states that during a chemical reaction

Which of the following statements about Ohm's Law is true? A. To increase the current, decrease the resistance. B. Keeping the same voltage and decreasing resistance decreases the current. C. Ohm's law relates power, current and resistance. D.

What is the thinnest film of a coating with n = 1.39 on glass (n=1.52) for which destructive interference of the red component (650 nm) of an incident white light beam in air can take place by reflection?

The prediction of the outcome of scientific processes based on analysis.

State the condition for maximum current to be drawn from the cell

Anti-reflective coatings on lenses use thin-film interference to eliminate the reflection of a particular color. Suppose a glass lens (ng = 1.53) is covered with a thin film (nf = 1.31) to prevent green light (λ = 534 nm) from being reflected.

Light incident on a surface at an angle of 45 degrees undergoes diffused reflection. At what angle will it reflect?

A ship on the surface of the ocean receives a sonar echo back from an underwater object. The echo path from the object to the ship is at an angle of 35 degrees above the horizontal and takes 3s to return. (Velocity of sound in sea water = 1500m/s).

A wave has a speed of 6 m/s and a wavelength of 12 m. What is the frequency of this wave? a. 2.0 Hz b. 0.5 Hz c. 18 Hz d. 72 Hz