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charle [14.2K]
3 years ago
15

A force applied to an object at rest causes the object to move. According to Newton’s first law, what must be true of the force?

Physics
1 answer:
Daniel [21]3 years ago
4 0

Answer:

An object will not move unless acted upon by an unbalanced force.

Explanation:

Since Newton's first law states that if a body is at rest or moving at a constant speed in a straight line, it will remain at rest or keep moving in a straight line at constant speed unless it is acted upon by a force.

Hope this helps!!

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A uniform 2.00-kg circular disk of radius 20.0 cm is rotating clockwise about an axis through its center with an angular speed 3
riadik2000 [5.3K]

Answer:

   w = 132.57 rad / s

Explanation:

To solve this exercise we must define a system formed by the two discs, therefore the angular momentum is conserved

initial

         L₀ = I₀ w₀

final

         L_f = I w

how the moment is preserved

         L₀ = L_f

         I₀ w₀ = I w

         

the moment of inertia of disk 1 is

         I₀ = ½ m₁ r₁²

The moment of inertia of the set is

        I = I₀ + I₂

        I = ½ m₁ r₁² + ½ m₂ r₂²

we substitute

       ½ m₁ r₁² w₀ = (½ m₁ r₁² + ½ m₂ r₂²) w

       w = \frac{ m_1r_1^2 }{ m_1 r_1^2+ m_2r_2^2}    \omega_o

let's reduce the magnitudes to the SI system

        w₀ = 30.0 rev / s (2π rad / 1 rev) = 188.5 rad / s

let's calculate

        w = ( \frac{ 2 \ 0.20^2}{ 2 \ 0.20^2 + 1.5 \ 0.15^2 }) 188.5

        w = ( \frac{0.08}{ 0.11375}  ) 188.5

        w = 132.57 rad / s

4 0
3 years ago
. Boxes are sitting on a conveyor belt as the conveyor is turned on, moving the boxes toward the right. The belt reaches full sp
oksian1 [2.3K]

Answer:

The acceleration of the boxes is 1.5 ft/s²

The displacement of the boxes during the speed-up period is 0.1875 ft.

Explanation:

Hi there!

Let´s convert the 45 ft/min into ft/s:

45 ft/min ·  1 min/ 60 s = 0.75 ft/s

It takes the belt 0.5 s to reach this speed. Then, the acceleration of the boxes will be:

a = v/t

Where:

a = acceleration.

v = velocity.

t = time.

a = 0.75 ft/s / 0.5 s

a = 1.5 ft/s²

The acceleration of the boxes is 1.5 ft/s²

The equation of displacement is the following:

x = x0 + v0 · t + 1/2 · a · t²

Where:

x = position of the boxes at time t.

x0 = initial position.

v0 = initial velocity.

t = time.

a = acceleration.

Since the origin of the frame of reference is located at the point where the boxes begin to move, x0 = 0. Since the boxes were initially at rest, v0 = 0. Then:

x = 1/2 · a · t²

x = 1/2 · 1.5 ft/s² · (0.5 s)²

x = 0. 1875 ft

The displacement of the boxes during the speed-up period is 0.1875 ft.

5 0
3 years ago
A uniform cylindrical grinding wheel of mass 50.0 kg and diameter 1.0 m is turned on by an electric motor. The friction in the b
aliya0001 [1]

Answer:

The torque must be applied to the wheel is 15.7 N-m.  

Explanation:

Given that,

Mass of the wheel of cylinder, m = 50 kg

Diameter of the wheel, d = 1 m

Radius, r = 0.5 m      

Initial speed off the wheel is 0

Final angular speed of the wheel, 120 rev/min = 12.56 rad/s

Angular displacement, \theta=20\ rev=125.6\ rad

The torque is given by :

\tau=I\alpha \\\\\tau=\dfrac{mr^2}{2}\times (\dfrac{\omega_f^2}{2\theta})\\\\\tau=\dfrac{50\times1^{2}}{2}\times(\dfrac{12.56^{2}}{2\times125.6})\\\\\tau=15.7\ N-m

So, the torque must be applied to the wheel is 15.7 N-m.

4 0
3 years ago
Which statement describes between a cup if cold water and a cup of boiling water
marishachu [46]
The thermal energy keeps these two changing their temperature over time. 

The surrounding temperature (environment) clearly effects the cold water AND the boiling water. 

Eventually, both would reach an equilibrium in temperature. <span />
4 0
3 years ago
Julia margaret cameron used a short focal length lens that allowed only a small area of sharp focus. what kind of effect would a
Klio2033 [76]

Julia margaret cameron used a short focal length lens that allowed only a small area of sharp focus. The effect that the lens like this produce would be Less Magnification and Wide Angle of view.

A lens having short focal length will produce Less Magnification and Wide Angle of view.

Short focal length gives a deeper depth of the present field in addition to the wide angle of view. They capture maximally that lies in their front of the camera to the infinity.

A lens with large focal length captures a narrow field band as compared to the one with short focal length.

The lower focal length shows the short depth of focus leading to less magnification.

Short focal length is determined by the radius of curvature of both the curvature of the lens, the medium of the surrounding and the refractive index of the lens given.

Focal length of camera shows how much band the camera is able to capture.

Learn more about Focal length here, brainly.com/question/16188698

#SPJ4

4 0
2 years ago
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