A hybrid car achieves an average of 54 miles/gallon on the highway and 41 miles/gallon in the city. Estimate the average miles/gallon for a trip consisting of 204.5 miles on the highway and 32.8 miles in the city, then convert this number to SI units (km/L). (Consider 1 gallon = 3.8 L and 1 mile = 1.41 km.)

Asmall 12.00g plastic ball is suspended by a string in a uniform, horizontal electric field with a magnitude of 10^3 n/c. if the ball is in equilibrium when the string makes a 30 ° angle with the vertical, what is the net charge on the ball?

Uranium has two naturally occurring isotopes. 238u has a natural abundance of 99.3% and 235u has an abundance of 0.7%. it is the rarer 235u that is needed for nuclear reactors. the isotopes are separated by forming uranium hexafluoride uf6, which is a gas, then allowing it to diffuse through a series of porous membranes. 235uf6 has a slightly larger rms speed than 238uf6 and diffuses slightly faster. many repetitions of this procedure gradually separate the two isotopes. what is the ratio of the rms speed of 235uf6 to that of 238uf6? express your answer to five significant figures.

Which type of energy is transferred by convection currents?