7. A 55 kg block of metal has an original temperature of 15°C and a specific heat of 450 J/kg°C. What will be the final temperature of
this metal if 450 J of heat energy is added?

A10nc charge sits at a point in space where the magnitude of the electric field is 1500 n/c. what will the magnitude of the field be if the 10 nc charge is replaced by a 20 nc charge? assume the system is big enough to consider the charges as small test charges.

It's a snowy day and you're pulling a friend along a level road on a sled. you've both been taking physics, so she asks what you think the coefficient of friction between the sled and the snow is. you've been walking at a steady 1.5m/s, and the rope pulls up on the sled at a 32 ∘ angle. you estimate that the mass of the sled, with your friend on it, is 65 kg and that you're pulling with a force of 80 n .

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?