Q12: An electric circuit consists of resistance of 5 ohm and two parallel thick wires at 40 cm distance apart. A metal rod is placed perpendicular to
wires to close the circuit, if the confined area between the wires was
perpendicular to magnetic flux density 0.3T, The force required to move
metal rod to acquire a uniform velocity of 400 cm/min, is:

If the wheels lock when braking suddenly the vehicle: a: loses traction b: lose steering wheel ability c: gain speed slightly d: gain steering ability

What is the kinetic energy of a baseball moving at a speed of 40 m/s if the baseball has mass of 0.15 kg?

Awelder using a tank of volume 7.50×10^-2 m^3 fills it with oxygen (with a molar mass of 32.0 g/mol ) at a gauge pressure of 3.30×10^5 pa and temperature of 37.1 ∘c. the tank has a small leak, and in time some of the oxygen leaks out. on a day when the temperature is 23.1 ∘c, the gauge pressure of the oxygen in the tank is 2.00×10^5 pa . a) find the initial mass of oxygen. b) find the mass of oxygen that has leaked out.