18. The orbits of planets being elliptical was one the planetary laws developed by

DNA is made of chains of four smaller molecules called: Select one: a. DNAblers b. life blocks c. nucleotides d. mitochondrial bases

You slide a chair across a rough, horizontal surface. The chair's mass is 18.8 kg. The force you exert on the chair is 156 N directed 26 degrees below the horizontal. While you slide the chair a distance of 5.00 m, the chair's speed changes from 1.

How much time does it take Mrs. Spencer to travel 240meters at a speed of 80meters per second?

Remember Force=Springconstant x extension (F = k xX) 1. If a spring starts at a length of 13cm, and it extends to a length of 21cm - what is the extension of the spring? Can you convert you answer into meters?

If the frequency of sound wave is doubled, the wavelength:

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