Physics Answers

149600000 km is equivalent to:

A) 149.6 Gm

B) 1.496 Tm

C) 149.6 Mm

D) 1.496 nm

The wavelength of red light is approximately 650 nanometres. This is equivalent to:

A) 650 000,000,000 m

B) 0.00000000065 m

C) 0.65 μm

D) 0.065 mm

The unit for the Young modulus is:

A) mm/m

B) %

C) Nm^-1

D) Nm^-2

The correct answer to 2 ×10⁷ × 8 ×10^-12 in standard form is:

A) 1.6 x 10^-4

B) 16 x 10¹⁹

C) 1.6 x 10¹⁹

D) 16 x 10^-5

Planck’s constant is given in Wikipedia as 6.62606957x10^-34 Js. How many significant figures is this?

A) 10

B) 9

C) 8

D) 7

Which of the following is the correct unit for momentum?

A) kg s^-1

B) kg m s^-1

C) kg m s^-2

D) kg m^-1 s^-1

Which unit is not used to measure pressure?

A) pound-force per square inch (psi)

B) kilogram per metre cubed

C) millimetre of mercury

D) newton per square metre

Using the following equations for force, work done, power, current and potential difference (or otherwise) give the following derived units in terms of base units. Show all of your working.

F=ma, W=Fd, P=ΔW/Δt', I=ΔQ/tΔ, V=W/Q

a. Joules

b. Watts

c. Volts

a trolley runs from P to Q along a track.At Q its PE is 50KJ less than at P.At P,KE of trolley is 5KJ.Between P and Q work that trolley does against friction is 10KJ.What is KE of trolley at Q?

A 240-turn solenoid is 80.0cm long and carries a current of 0.30A. Calculate the magnitude of the magnetic field at the center of solenoid.