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2 years ago

What is a substance?

Physics

1 answer:

Anna007 [38]2 years ago

3 0

Answer:

A physical matter

Explanation:

A kind of matter with uniform physical properties

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A passenger compartment of a rotating amusement park ride contains a bench on which a book of mass

Basile [38]

a) 120 s

b) v = 0.052R [m/s]

Explanation:

The period of a revolution in a simple harmonic motion is the time taken for the object in motion to complete one cycle (in this case, the time taken to complete one revolution).

The graph of the problem is missing, find it in attachment.

To find the period of revolution of the book, we have to find the time between two consecutive points of the graph that have exactly the same shape, which correspond to two points in which the book is located at the same position.

The first point we take is t = 0, when the position of the book is x = 0.

Then, the next point with same shape is at t = 120 s, where the book returns at x = 0 m.

Therefore, the period is

T = 120 s - 0 s = 120 s

The tangential speed of the book is given by the ratio between the distance covered during one revolution, which is the perimeter of the wheel, and the time taken, which is the period.

The perimeter of the wheel is:

$L=2\pi R$

where R is the radius of the wheel.

The period of revolution is:

$T=120 s$

Therefore, the tangential speed of the book is:

$v=\frac{L}{T}=\frac{2\pi R}{120}=0.052R$

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2 years ago

An airplane travels 975 miles south from one airport to another at an average speed of 250 mph (miles per hour). How much time w

Maru [420]

Answer:

3.9 hours

Explanation:

7 0

2 years ago

A 0.145-kg baseball pitched horizontally at 35.0 m/s strikes a bat and is popped straight up to a height of 40.0m. If the contac

Nookie1986 [14]

Answer:

$F = 2.6 \times 10^3 N$

Explanation:

Maximum height reached by the ball after being popped by the bat is given as

$y = 40 m$

now we know by energy conservation final speed of the ball after being hit by the bat is given as

$\frac{1}{2}mv^2 = mgh$

$v = \sqrt{2gh}$

$v = \sqrt{2(9.81)(40)}$

$v = 28 m/s$

now the change in momentum of the ball is given as

$\Delta P = m(v_f - v_i)$

$\Delta P = 0.145(28\hat j + 35 \hat i)$

now force is given as rate of change in momentum

$F = \frac{\Delta P}{\Delta t}$

$F = \frac{0.145(28\hat j + 35 \hat i)}{2.5 \times 10^{-3}}$

$F = (1.62 \hat j + 2.03 \hat i)\times 10^3 N$

so magnitude of the force is given as

$F = \sqrt{1.62^2 + 2.03^2} \times 10^3 N$

$F = 2.6 \times 10^3 N$

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2 years ago

What activities areaways to overcome barriers to physical fitness

dexar [7]

Answer:

No Time

Schedule activities into your day and use an exercise log so you can see how little time it takes.

Build activities into everyday tasks no matter where you are: Bike to work. Use the stairs. Take walk breaks at work. Garden. ...

Find an activity you enjoy that works for your schedule

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2 years ago

Huck Finn walks at a speed of 0.70 m/sm/s across his raft (that is, he walks perpendicular to the raft's motion relative to the

exis [7]

Answer:

Explanation:

Given

Velocity of Huck w.r.t to raft $v_{H,raft}=0.7\ m/s$

Perpendicular to the motion of raft

Velocity of Raft in the river $v_{raft,river}=1.6\ m/s$

As Huck is traveling Perpendicular to the raft so he possess two velocities i.e. vertical velocity and horizontal velocity of River when observed from bank

$v_{Huck,river\ bank}=0.7\hat{j}+1.6\hat{i}$