Lever: a bar used to move something
Wedge: a tool used to go in between object to put them in place
Incline plane : a ramp it’s used to help rise heavy things
Pulley: it’s a wheel that supports movement and change of direction
Answer:
3.46 s
Explanation:
First of all, we can calculate the acceleration of the elevator by using Newton's second law:
and the acceleration has the same direction of the net force (upward).
Now we can calculate the time takes for the elevator to cover a distance of S=15 m by using the following SUVAT equation:
where a is the acceleration and t the time. Re-arranging the equation, we find
9W 3V bulb need current flow
I = P/V = 9/3 = 3A
connected serially, voltage drop on the wire will be = Vsupply - 3(Vbulb) = 12 - 3(3) = 3V.
resistance of the wire ,with I=3 and V=3, = V/I = 3/3 = 1 Ohm.
Answer:
1.b 2.d 3.b 4.a 5.c
Explanation:
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