In projectile motion, the vertical velocity is independent of the horizontal velocity so we can completely ignore it. The vertical velocity is, using trigonometry, 18sin35° which is equal to 10.3 m/s.
Using a = -9.8 m/s^2 and u= 10.3 and V= 0 (because at a point, the object will be hovering in the air with 0 speed before coming back down), we have
v = u + at
=> (v-u)/a = t
=> (0-10.3)/a = t
=> -10.3/-9.8 = t
=> t = 1.05 s
the time taken to come down will be the same as the time taken to go up so total time before ball hits the ground is double the value we just found
which is 2 x 1.05 = 2.10 seconds
Answer:
0.2v
Explanation:
Data given,
Diameter=18.5cm
Hence we can calculate the radius as D/2=18.5/2=9.25cm
radius=9.25cm/100=0.0925m
The area is calculated as
magnetic field, B=1.3T
time,t=0.18s
The flux is expressed as
since the loop is parallel, the angle is 0
Hence we can calculate the flux as
to determine the emf induced in the loop, we use Faraday law
Note the voltage is not negative but the negative sign shows the current flows in other to oppose the flux
IF there is no air resistance, then he could drop a feather, a piece
of Kleenex, a school bus, and a battleship. If he dropped them all
at the same time from the same height, they would all hit the ground
at the same time.
You mean like a box sitting on a table.
One force is the force of gravity, pulling downward on the box.
Now, you know that the forces acting on the box must be balanced, because
if they're not, then the box would be accelerating. But it's just sitting there, so
there must be some other force, just exactly the right strength and direction to
exactly cancel the force of gravity on the box, so that the net force on it is zero.
The other force is the force of the table pushing upward on the box. It's called
the "normal force".
