A carnot heat engine has an efficiency of 0.800. if it operates between a deep lake with a constant temperature of 280.0 k and a hot reservoir, what is the temperature of the hot reservoir?

State 2 defects of primary cells

The fact that parts of the sun spin at varying speeds is referred to as differential rotation. true false

Explain how a step-down transformer makes electricity safe for use in homes.

A heater gives off heat at a rate of 330 kj/min. what is the rate of heat output in kilocalories per hour? (1 cal 4.184 j)

According to Newton's Second Law, the force of the club hitting the golf ball will cause it to accelerate.

In what way would a digital thermometer be preferable to those from a liquid-based thermometer? Digital thermometer readings are easier to use when performing calculations.

Why does the core of the sun contain more helium and less hydrogen than the surface of the sun?

What happens to a light ray passing through the center of a lens?

A spider crawling across a table leaps onto a magazine blocking its path. The initial velocity of the spider is 0.870 m/s at an angle of 35.0° above the table, and it lands on the magazine 0.0770s after leaving the table. Ignore air resistance.

A force of 5 N accelerates an object. The object's mass is 50 g. What is the acceleration of the object? (Formula: F=ma)