The tangential velocity of the ball is 0.63 m/s.
<h3>
What is tangential speed?</h3>
Tangential speed is the linear component of the speed of any object moving along a circular path.
v = ωr
where;
- v is the tangential speed
- ω is the angular speed (rad/s)
- r is the radius of the circle
At a given radius of the circle = 0.3 m
Let the number of revolution per min = 20 rev/min

v = ωr
v = 2.1 x 0.3
v = 0.63 m/s
Thus, the tangential velocity of the ball is 0.63 m/s.
Learn more about tangential velocity here: brainly.com/question/25780931
Answer:
True
Explanation:
When a ray travelling parallel to the principle axis of a concave mirror then the light ray reflect out through the mirrors and passing through the focus.
When a light ray travelling through focus of a concave mirror then after reflection the light ray reflect out through the mirror and go parallel to principle axis.
Therefore, rays travelling parallel to the principle axis of a concave mirror will reflect out through the mirrors focus.
It is true.
A typical wheel used on a roller coaster is constructed by taking an aluminum hub and bonding a polyurethane tire to the hub's outside diameter. This entire “wheel assembly” is then connected to the axle through a bearing.
Answer:
8.0s
Explanation:
45 km/h ÷ 3.6 = 12.5 m/s
t.v = d/t
vt/v = d/v
t = d/v = 100.0m /12.5 m/s = 8.0s
Hope this helps!!
Answer:
(a) 43.2 kC
(b) 0.012V kWh
(c) 0.108V cents
Explanation:
<u>Given:</u>
- i = current flow = 3 A
- t = time interval for which the current flow =

- V = terminal voltage of the battery
- R = rate of energy = 9 cents/kWh
<u>Assume:</u>
- Q = charge transported as a result of charging
- E = energy expended
- C = cost of charging
Part (a):
We know that the charge flow rate is the electric current flow through a wire.

Hence, 43.2 kC of charge is transported as a result of charging.
Part (b):
We know the electrical energy dissipated due to current flow across a voltage drop for a time interval is given by:

Hence, 0.012V kWh is expended in charging the battery.
Part (c):
We know that the energy cost is equal to the product of energy expended and the rate of energy.

Hence, 0.108V cents is the charging cost of the battery.