Measurements

Which of these is a derived unit?

• 1 Metre
• 2 Second
• 3 Kilogram
• 4 Newton

The dimensions of velocity are:

• 1 [L^2 T^-1]
• 2 [L T^-1]
• 3 [L T^-2]
• 4 [M L T^-1]

How many significant figures are in 0.004050?

• 1 3
• 2 6
• 3 2
• 4 4

A length is measured as 2.50 m with an uncertainty of 0.05 m. The percentage uncertainty is:

• 1 0.2 percent
• 2 5 percent
• 3 0.05 percent
• 4 2 percent

Which quantity has the dimensions [M L^2 T^-2]?

• 1 Pressure
• 2 Force
• 3 Energy
• 4 Power