Answer:
375 j
Explanation:
Work done = increase in kinetic energy
C is the correct answer for this question. 375 work must be done on a 10 kg bicycle.
1: 1/5*10 * (10+5)(10-5)
Work Done: 375J
<em><u>Hope this helps.</u></em>
Electric current is measured in Ampere
Answer:
The value of the centripetal forces are same.
Explanation:
Given:
The masses of the cars are same. The radii of the banked paths are same. The weight of an object on the moon is about one sixth of its weight on earth.
The expression for centripetal force is given by,
where, is the mass of the object, is the velocity of the object and is the radius of the path.
The value of the centripetal force depends on the mass of the object, not on its weight.
As both on moon and earth the velocity of the cars and the radii of the paths are same, so the centripetal forces are the same.
The correct option is (D). i.e.<span>When the current is too high, a metal strip in the fuse melts and opens the circuit.
Explanation: </span>The fuse contains a small piece of wire which has very less melting point. As there is huge current flow, the wire heats to the heavy current flow & melts & the circuit is broken.
Hence, it saves the device from the heavy current flow & the device is damage free. breaks the circuit if a fault in an appliance causes too much current flow.
Answer:
808.25 seconds
Explanation:
From the relation,
If t = time
v = velocity
l = length
The current density, J, of a charge is given by:
Where number of charge carriers per unit volume n = 8.49 * 10²⁸
Charge of the electron, q = 1.6 * 10⁻¹⁹
Cross sectional area of the wire, A = 0.21 cm² = 0.000021 m²
Equating (1) and (2)
Since t = l/v.......(3)
Put the formula for v into equation (3)
t = 808.25 seconds