A star is observed to have a temperature of 3000 K and then luminosity of 105.

What is the color of the star?

In a thunderstorm, the air must be ionized by a high voltage before a conducting path for a lightning bolt can be created. an electric field of about 1.0 * 106 v/m is required to ionize dry air.

What is the rate at which work is done in lifting a 35 kg object vertically at a constant speed of 5 m/s? 1 1700 W 2 340 W 3 180 W 4 7.0 W

Light strikes a mirror's surface at 33 degrees to the surface. what will the angle of reflection be? what is the angle betwwen incident ray and reflected way

Do you understand volume flow rate? Determine the time required for a 50-L container to be filled with water when the speed of the incoming water is 25 cm/s and the cross-sectional area of the hose carrying the water is 3 cm2.

When landing after a spectacular somersault, a 50.0 kg gymnast decelerates by pushing straight down on the mat. Calculate the force (in N) she must exert if her deceleration is 7.00 times the acceleration of gravity.

What is the relationship between the mass and period in a mass hanging on spring oscillation and why?

Saturn's moon Titan has a mass of 1.35 * 1023 kg. If Titan is 1.19 * 106 km from Saturn, and Saturn's mass is 5.86 * 1026 kg, what is the gravitational force between Saturn and its moon? 2.76 * 104 N 3.29 * 107 N 3.73 * 1021 N 4.43 * 1030 N

What has occured when bubbles form in a liquid that is being heated

What would happen to the supply of ATP in your cells if you did not eat enough carbohydrates?

According to a rule-of-thumb, every 5 seconds, between a lightning flash and the following thunder gives the distance to the flash in miles.