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3 years ago

4. A billiard ball rolls from rest down a smooth ramp that is 8.0 m long. The

Physics

1 answer:

Arisa [49]3 years ago

8 0

Answer:

Explanation:

The formula S=(at^2)/2 will be used during the entire explanation.

1. 4 = (2t^2)/2

t = 2 s.

V = at = 2 * 2 = 4 m/s

2. 8 = (2t^2)/2

t = 2.8 s

iii. 2s

iv. 2.8 - 2 = 0.8s

Hope you understand)

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Two forces are applied to a tree stump to pull it out of the ground. Force A has a magnitude of 2410 newtons (N) and points 36.0

Anarel [89]

Answer:

The magnitude of the resultant force is 6201 N

The direction of the resultant force is 72°

Explanation:

Please find the attached file for explanation;

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3 years ago

Which is the truest statement? Standing is health-enhancing because it uses energy. Jogging is not a good way tp enhance your he

Setler [38]

A. <span>Standing is health-enhancing because it uses energy.

Because standing can burn a lot of calories.</span>

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3 years ago

An arrow is shot at an angle 38 ◦ with the horizontal. It has a velocity of 46 m/s. How high will the arrow go?

Klio2033 [76]

Answer:

40·919 m

Explanation:

Initial velocity of the arrow = 46 m/s

Angle at which it is thrown from horizontal = 38°

<h3>At the maximum height, the vertical component of velocity will be 0</h3>

Initial velocity in vertical direction = 46 × sin(38) = 28·32 m/s

From the formula

where

v is the final velocity

u is the initial velocity

a is the acceleration

s is the displacement

Considering the formula in vertical direction and taking upward direction as positive

v = 0

u = 28·32 m/s

a = - g = - 9·8 m/s²

Let s be the maximum height

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⇒ s = 40·919 m

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3 years ago

A bike race against the clock takes place on a straight road. Yan drives at 37 km / h and he starts the course 30s before Christ

joja [24]

Given data:

Yan speed;

$u_1=37\text{ km/h}$

Christopher speed;

$u_2=38.9\text{ km/h}$

Christophe starts 30 s later than Yan. Therefore, Christophe takes 30 s less than Yan to reach the same distance.

Part (A)

The distance is given as,

$d=ut$

Let both Yan and Christophe meet at d distance from the start position. Therefore,

$u_1t=u_2(t-30)$

Substituting all known values,

$\begin{gathered} (37\text{ km/h})t=(38.9\text{ km/h})\times(t-30) \\ \frac{(37\text{ km/h})}{(38.9\text{ km/h})}=\frac{(t-30)}{t} \\ 0.95=1-\frac{30}{t} \\ \frac{30}{t}=1-0.95 \\ \frac{30}{t}=0.05 \\ t=\frac{30}{0.05} \\ t=600\text{ s} \end{gathered}$

Therefore, 600 s after Yan's departure Christophe will join him.

Part (B)

The distance is given as,

$d=u_1t$

Substituting all known values,

$\begin{gathered} d=(37\text{ km/h})\times(600\text{ s}) \\ =(37\text{ km/h})\times(600\text{ s})\times(\frac{1\text{ hr}}{3600\text{ s}}) \\ \approx6.17\text{ km} \end{gathered}$

Therefore, Christophe joins Yan after 6.17 km from the start.

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1 year ago

What conditions can impact the ecological tolerance of a species? <br> Pls Answer,30 points

Eduardwww [97]

Answer:

climatic changes

ambient changes

human interferance and the growt of cities and human civilization

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Explanation:

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3 years ago