Jamal blasts an air-horn to start a race. Lewis hears the horn from his house 274 meters away. Given that sound travels through air at 340 m/s, how long did it take the sound to travel from Jamal to Lewis?

440 s

0.81 s

1.2 s

66 s

A 20kg rock is on the edge of a 100m cliff. what gravitational energy does the rock process relative to the base of the cliff

What holds metal ions together?

Select the correct answer. What is a direct result of having greenhouse gases in the atmosphere? A. releasing radiation into space B. melting glaciers C. depleting the ozone layer D. trapping the sun's energy in the atmosphere

Which of the following has a natural pH that is acidic? rain fresh water lakes sea water tap water

List four ways of separate a mixture

n open rectangular tank is filled to a depth of 2 m with water (density 1000 kg/m3). On top of the water there is a 1 m deep layer of gasoline (density 700 kg/m3). The width of the tank is 1 m (the direction perpendicular to the paper).

Is the sun considered a star?

If I get a spare in one frame and then roll a 1 and 5 in the next frame, what would my score for the spare be? A 10 B 11 C 16 D17

2x^2:3=dg solve for x

A 2.25-kg block is released from rest on a ramp of height h. when the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 15.