A flat rectangular loop of wire is placed between the poles of a magnet. It has dimensions w = 0.60 m and L = 1.0 m, and carries a current I = 2.0 A. The magnetic field due to the magnet is uniform and of magnitude 0.80 T. The loop rotates in the magnetic field and at one point the plane of the loop makes a 30° angle with the field. At that instant, what is the magnitude of the torque acting on the wire due to the magnetic field?

An electron moves with a speed of 8.0 × 10^6 m/s along the +x-axis.  It enters a region where there is a magnetic field of 2.5 T, directed at an angle of 60° to the +x-axis and lying in the xy-plane.  Calculate the magnitude of the acceleration of the electron. (e = 1.60 × 10^-19 C, me1 = 9.11 × 10^-31 kg)  

If the nominal interest rate is 5% and the rate of inflation is 10%, the real interest rate is

A cheetah leaps horizontally off a cliff with a speed of 6.30 m/s.  The cheetah lands a horizontal distance of 17.6 m from the base of the cliff. a) How fast is the cheetah going right before it lands?

Suppose you want to open a dog grooming business. You need to purchase a building, a truck, and some equipment. Economists call this investment.

Suppose an investment tax credit was passed that encouraged businesses to borrow more for investment. What would happen in the market for loanable funds? 

Because saving and investment are equal for an economy, saving and investment must be equal for each person in the economy.

Suppose the price index in 2010 is 120, and in 2011 the price index is 180. What is the inflation rate from 2010 to 2011?

A cheetah leaps horizontally off a cliff with a speed of 6.30 m/s.  The cheetah lands a horizontal distance of 17.6 m from the base of the cliff. a) How tall is the cliff?

Suppose GDP for an economy is $12,000. If consumption is $7,000, investment is $2,000, and government spending is $4,000, what is net exports?