Evaluate `60 times 40`

A pendulum oscillates 40 times in 4 seconds. Find its time period and frequency.

Evaluate :60^(3)+40^(3)-100^(3)

Evaluate tan 40^@ xx tan 50^@

Evaluate : 2 sec 30^(@) xx tan 60^(@)

Evaluate : (cot40^(@))/(tan50^(@))-(1)/(2)((cos30^(@))/(sin60^(@)))

Find the product, using the associative property of multiplication: 975 times 5 times 40

Evaluate the following: i^(30)+i^(40)+i^(60)

In a given time of 10s, 40s electrons pass from right to left. In the same interval of time 40 protons also pass from left to right. Is the average current zero? If not, the find the value of average current.