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3 years ago

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You exert a 100-N force on a pulley system to lift 300 N. What's the mechanical advantage of this system? How many sections of r

ope support the weight?

1 answer:

tigry1 [53]3 years ago

4 0

Mechanical advantage: 200N
Sections of the rope: 1

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You stand on a bridge above a river and drop a rock into the water below from a height of 25 m. (Assume no air resistance)

Ilia_Sergeevich [38]

PART a)

here when stone is dropped there is only gravitational force on it

so its acceleration is only due to gravity

so we will have

$a = g = 9.8 m/s^2$

Part b)

Now from kinematics equation we will have

$y = v_i t + \frac{1}{2} at^2$

now we have

y = 25 m

so from above equation

$25 = 0 + \frac{1}{2}(9.8 )t^2$

$t = 2.26 s$

Part c)

If we throw the rock horizontally by speed 20 m/s

then in this case there is no change in the vertical velocity

so it will take same time to reach the water surface as it took initially

So t = 2.26 s

Part D)

Initial speed = 20 m/s

angle of projection = 65 degree

now we have

$v_x = vcos\theta$

$v_x = 20 cos65 = 8.45 m/s$

$v_y = vsin\theta$

$v_y = 20 sin65 = 18.13 m/s$

PART E)

when stone will reach to maximum height then we know that its final speed in y direction becomes zero

so here we can use kinematics in Y direction

$v_f - v_y = at$

$0 - 18.13 = (-9.8) t$

$t = 1.85 s$

so it will take 1.85 s to reach the top

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2 years ago

How does gay-lussac's law apply to everyday life?

vladimir2022 [97]

Gay-Lussac's Law shows the direct relationship between pressure and temperature for an ideal gas with constant volume. Mathematically it is
$\frac{P_{1}}{T_{1}} = \frac{P_{2}}{T_{2}}$

This particular has a lot of application in our everyday life. In cooking, for example, we apply this concept when using a pressure cooker. We increase/decrease the temperature to meet the right amount of pressure.

In addition, knowing that pressure increases when temperature does can help you with road safety. Knowing that temperature affects heat directly, we must be careful in making sure that tires are not overheated or else they explode out of too much pressure inside.

5 0

3 years ago

A train travels 225 kilometers in 2.5 hours. What is the train’s average speed?

ella [17]

The train travells at he speed of 225 km/2.5h
now
225km=225000m
2.5 hr=150min=9000s
=>avg sp of train is=225000/9000s=25m/s

7 0

3 years ago

Read 2 more answers

Ian pushed a piano across the room with the correct amount of force. Which of newton’s laws is this?

Black_prince [1.1K]

Answer:

1st and 2nd

Explanation:

6 0

2 years ago

Corbin, an avid skier leaves the horizontal end of a ramp with a velocity of 33.0 m/s and lands 63.0 m from the base the ramp. H

ahrayia [7]

Answer:

Height of ramp = 17.49 m

Explanation:

We have equation of motion , $s= ut+\frac{1}{2} at^2$ , s is the displacement, u is the initial velocity, a is the acceleration and t is the time.

Considering horizontal motion of skier

Initial velocity = 33 m/s, Displacement = 63 m, acceleration = 0 and we need to find time taken to reach ground by the skier.

$63= 33t+\frac{1}{2} *0*t^2\\ \\ t=1.909seconds$

The vertical distance traveled in 1.909 seconds is the height of ramp

Initial velocity = 0 m/s, acceleration = acceleration due to gravity = 9.8 $m/s^2$ , time = 1.909 s and we need to find displacement.

$s= 0*1.909+\frac{1}{2} *9.8*1.909^2\\ \\ s=17.49 m$

So height of ramp = 17.49 m

5 0

3 years ago