On a cosmic calendar, in which the history of the universe is compressed into one year, when did kepler and galileo first discover that we live on a planet in a solar system

A child sitting 1.10m from the center of a merry-go-round moves with a speed of 1.25m/s. calculate (a) the centripetal acceleration of the child, and (b) the net horizontal force exerted on the child (mass=25.0 kg)

A hot water heater is operated by using solar power. if the solar collector has an area of 5.3 m2, and the power delivered by sunlight is 995 w/m2, how long will it take to increase the temperature of 1 m3 of water from 20 ◦c to 65 ◦c?

What is mass and forces

Compare the earths climate today with its climate during an ice age.

A cube of side 3.56 cm has a charge of 9.11 μ C placed at its center. Calculate the electric flux through one side of the cube

Which statement about an electron in the 4d state is correct? A. The magnitude of its orbital angular momentum is 6√ℏ. B. The largest orbital angular momentum it could have in any given direction is 4ℏ. C.

A D note has a frequency of 587.33 Hz. Calculate its wavelength in meters. The speed of sound is 343 m/s

A cyclist allows his bike to roll down a hill without pedaling. Towards the bottom of the hill he applies his brakes. The bike comes to a stop. Applying the brakes causes the brakes to warm up. Describe the energy transfers that have occurred.

An object is placed in a fluid and then released. Assume that the object either floats to the surface (settling so that the object is partly above and partly below the fluid surface) or sinks to the bottom.

Explain why it is important to have strong core muscles?