What wave is used reflecting from the ionosphere?

P=25 watts W=5000 joules t=? what is time

A box with a total surface area of 1.88 m^2 and a wall thickness of 2.44 cm is made of an insulating material. A 14.1 W electric heater inside the box maintains the inside temperature at 18.6 ◦C above the outside temperature.

How long does it take a cup of fresh water to freeze, boil and evaporate compared to fresh water

A balloon has a volume of 1.5-L at 25*C. What would be the volume of the balloon if it were placed in a container of hot water at 90*C?

9. Early expeditions to Antarctica reported on seeing fossils, but they did not collect them. Who first reported seeing fossils of leaves and stems of plants? Who reported finding beds of coal near the South Pole?

Select all the expressions below which represent a 20% discount off the price of an item that originally costs d dollars. A. 0.8d B. d-0.2 C. d-0.2d D. 1-0.2d

Life cycle of a medium mass star

Use the periodic table to complete this equation that represents the process of nuclear fusion. Superscript 14 Subscript 7 Baseline N + Superscript 1 Subscript 1 Baseline H yields Superscript A Subscript B Baseline C

Josh rolled a bowling ball down a lane in 2.5 seconds. The ball travelled at a constant acceleration of 1.8 m/s/s down the lane and was traveling at a speed of 7.6 m/s by the time it reached the pins at the end of the lane.

How many meters of the rock wall eroded between 1910 and 1927?