The specific heat (c) of copper is 0.39 J/g °C. What is the temperature

change (At) when 100 Joules of heat (Q) is added to 20 grams?

A 4.2-m-diameter merry-go-round is rotating freely with an angular velocity of 0.80 rad? s. Its total moment of inertia is 1360 kg? m2. Four people standing on the ground, each of mass 65 kg, suddenly step onto the edge of the merry-go-round.

initially at rest. The bullet is traveling 300 m/s when it hits the wood block and sticks inside it. Now the bullet and the wood block move together as one object. How fast are they traveling?

A 5.5 kg box is pushed across the lunch table. The acceleration of the box is 4.2 m/s2. What was the net force applied to the box? A) 1.3 N B) 1.31 N C) 9.7 N D) 23.1 N

Convert 150km/hr to m/s showing its workings

Dave pushes his four-year-old son thomas across the snow on a sled. as dave pushes, thomas speeds up. which statement is true?

The gravity of mercury is 3.7 n/kg. Find the mass of an astronaut who weights 241 Newton's on mercury

Why does oxygen have a lower ionization energy than nitrogen?

Traditional Indonesian music uses an ensemble called a gamelan that is based on tuned percussion instruments somewhat like gongs. In Bali, the gongs are often grouped in pairs that are slightly out of tune with each other.

An instrument used to detect a static electric charge is called an ammeter. a. true b. false

A heat engine has a cold reservoir of 250°C and a hot reservoir of 715°C. What is the efficienvy of the engine?