Carry out the following calculation. Express your answer in the correct number of significant figures.

A solid rectangular block has a density of 2.6 g/cm3. The block measures 1.8 cm by 4.0 cm by 2.3 cm. What is the mass, in g, of the block?

What is the internal energy of 4.00 mol of diatomic nitrogen gas n2 at 455k

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

Which is special about a dc circuit ? a. it has both series and parallel components b. it has only series or only parallel components c. charge moves in a single direction d. charge moves back and forth quickly