Approximately how long does it take a star the size of the sun to become a red giant?

a) 2 million years

b) 10 million years

c) 45 billion years

d) 25 million years

What is a thermostat?

If the resistance in a circuit connected to a constant current is halved, how is the voltage in the circuit affected? The voltage remains constant. The voltage is doubled. The voltage is reduced by a factor of 4.

What physical improvements might result from his training?

a motor boat heads east at 16 m/s across a river that flows north at 9 m/s. what is the resultant velocity speed and directions of the boat?

A beam of light is incident from air onto the surface of a liquid. When the angle of incidence is 45.0° the angle of refraction is found to be 36.0°.

Suppose s (t) is the position of an object moving along a line at time t is greater than or equal to 0. What is the average velocity between the times t=a and t=b? What is the instantaneous velocity at t=a?

Estimate how long it would take one person to mow a football field using an ordinary home lawn mower. suppose that the mower moves with a 1-km/h speed, has a 0.5-m width, and a field is 360 ft long and 160 ft wide. 1 m = 3.281 ft.

Badri makes the table below to review the factors that affect the electric force between objects. Which change will correct the error in Badri's table?

A star with the same mass of the sun has a newly discovered planet whose semi-major axis of 2.48 au and an eccentricity of 0.08. what is the aphelion distance of the new planet

A weather balloon is inflated to a volume of 2.2 x 10^3 L with 374 g of helium. What is the density of helium in grams per liter?