which of the following is true? a) speed is velocity w a vector b) speed is a scalar w direction c) speed is velocity w direction d) velocity is speed w a direction

What does the thermal energy of an object depend upon? the heat of that object and the density of particles the temperature, weight, and number of particles of that object the temperature and arrangement of the particles in that object the heat of

Electricity is one of two aspects of which fundamental force?

particle is projected from the surface of the planet Krypton with a speed equal to 3.6 times the escape speed from that planet's surface.

Name 5 machine principles

Sound emitted by an open organ pipe is more musical than emitted by a close one why?

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