A.Positive as work=force×distance (assuming that distance is always a constant) the work will always be positive as the force is always positive(this is because force=mass×acceleration where the acceleration is always positive unless the mass is being slowed down)
Answer:
-7.5 cm
Explanation:
OK so in the equation they're having you use the variables are:
So we simply plug in the variables:
(a) 
The torque exerted on the solid disk is given by
where
F is the magnitude of the force
r is the radius of the disk
is the angle between F and r
Here we have
F = 180 N
r = 0.280 m
(because the force is applied tangentially to the disk)
So the torque is
(b) 
First of all, we need to calculate the moment of inertia of the disk, which is given by
where
m = 75.0 kg is the mass of the disk
r = 0.280 m is the radius
Substituting,
And the angular acceleration can be found by using the equivalent of Newtons' second law for rotational motions:
where
is the torque exerted
I is the moment of inertia
is the angular acceleration
Solving for , we find:
Answer:
Select the answer that states:
<em>VX = constant, and ay = -g</em>
Explanation:
In the case of an object undergoing projectile motion, such motion is divided in two analysis. The vertical analysis uses kinematic equations associated with an accelerated motion under the constant acceleration of gravity, and the horizontal analysis is that of a uniform motion at constant velocity.
Therefore the projectile motion uses the velocity in the horizontal (x-direction) as constant. and the vertical motion (associated with the y-axis) a motion with acceleration equal to "g".
Then, the corect answer is the one that states:
"<em>VX = constant, and ay = -g</em>"
