Velocity is a speed AND a direction.
When you turn a corner, or go around a curve in the road, your
direction changes, but the reading on the dial doesn't change.
So it can't be showing velocity. It must be showing only speed.
That's probably a big part of the reason why it's called a speedometer
and not a velocimeter.
Answer:
W_net = mg + 2mgh/r
Explanation:
The forces applied in this motion of the bowling ball are both gravitational and centripetal forces.
Now, gravitational force is; F_g = mg
While centripetal force is; F_c = mv²/r
Since we want to express the net force in terms of the variables in the statement and we are not given "v", let's find an expression of v with the variables given.
Now, from Newton's equation of motion, at initial velocity of 0, v² = 2gh.
Thus;
F_c = 2mgh/r
Where;
m is ball mass
r is tube radius
h is fall height
Thus, the net force will be;
F_net = F_g + F_c
Now, Net force would be equal to the net weight that will be read on the scale.
Thus;
W_net = F_net = F_g + F_c
W_net = mg + 2mgh/r
Explanation:
Given that,
Distance, d = -56.3 m
It strikes the ground 4.00 seconds after being thrown.
Using second equation of motion to find the speed was the rock thrown. So,
Here, a = -g
Let it will cover a distance of s meters. So,
Explanation:
c) is equal to the momentum of the fired bullet
Answer:
0.695 m
Explanation:
α = angular acceleration of the fan blade = 14.1 rad/s²
a = tangential acceleration at the point concerned = acceleration due to gravity = 9.8 m/s²
r = distance of the point from axis of rotation at which tangential acceleration is same as acceleration due to gravity
We know the relation between
a = r α
Inserting the values
9.8 = 14.1 r
r = 0.695 m
