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3 years ago

Which name is given to the force that stretches the spring with a metal that weights it down

Physics

1 answer:

bulgar [2K]3 years ago

3 0

Answer:

gravity

Explanation:

ok what i understand from your query is that a spring balance with a metal piece attached to it is weighing it down, a spring balance is measured in newtons (f=ma), the acceleration part is gravity (-9.81 m/s^2). The metal piece is attached to the string.

hope this answers your question and please take my answer with a grain of salt and refer to some webpages or videos

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3. A box with a mass of 10.0 kg is placed on a hill that includes upwards at an angle of 30.0°.

FrozenT [24]

Given that,

Mass = 10 kg

Angle = 30°

Static friction = 0.582

Kinetic friction = 0.528

We need to calculate the parallel force

Using balance equation

$F =mg\sin\theta$

Put the value into the formula

$F= 10\times9.8\times\sin30$

$F = 49\ N$

Let’s determine the two friction forces

We need to calculate the static friction force

Using static friction force

$F_{s}=\mu mg\cos\theta$

Put the value into the formula

$F_{s}=0.582\times10\times9.8\cos30$

$F_{s}=49.4\ N$

Since the box is already moving, the force of the push must be greater than difference of the force parallel and the static friction force.

We need to calculate the kinetic friction force

Using kinetic friction force

$F_{k}=\mu mg\cos\theta$

Put the value into the formula

$F_{k}=0.528\times10\times9.8\cos30$

$F_{k}=44.8\ N$

Since this friction force is less than 49 N, the box will accelerate as it moves down hill.

Hence, This is required solution.

5 0

3 years ago

The burning rates of two different solid-fuel propellants used in aircrew escape systems are being studied. It is known that bot

Katena32 [7]

Answer: $z_{\text{calc}}=-0.32$

Explanation:

The test statistic for difference of two population means :-

$z=\dfrac{\mu_1-\mu_2}{\sigma\sqrt{\dfrac{1}{n_1}+\dfrac{1}{n_2}}}$

Given : $\sigma=\sigma_1=\sigma_2=3$

$n_1 = n_2 = 20$

$\mu_1=23.7$

$\mu_2=24$

Then , $z=\dfrac{23.7-24}{(3)\sqrt{\dfrac{1}{20}+\dfrac{1}{20}}}$

$\Rightarrow\ z=-0.316227766017\approx-0.32$

Hence, the value of $z_{\text{calc}}=-0.32$

5 0

4 years ago

If you stand at the edge of a cliff that is 75 m high and throw a rock directly up into the air with a velocity of 20 m/s, at wh

My name is Ann [436]

The vertical position of the rock is given by:

$y(t)=h+v_0 t -\frac{1}{2} gt^2$

where

h=75 m is the initial height

v0=20 m/s is the initial vertical velocity

g=9.81 m/s^2 is the acceleration due to gravity

The problem asks to find the time t at which the rock hits the ground, so the time t at which y(t)=0, so the equation above becomes:

$75 + 20 t - 4.9t^2 =0$

Which has two solutions:

t=-2.37 s

t=6.45 s

The first solution is a negative time so it has no physical meaning, therefore the correct answer is t=6.45 s.

4 0

3 years ago

Read 2 more answers

1. A _____________________ is a determination of an amount of something.

dem82 [27]

Answer:

1. quantity

2. by being taught what it meant

3. metric and customary

4. B) centimeter

5. time

6. C

7. about 463214283.627 seconds

8. add

9. B) distance

10. C) meter

Explanation:

plz mark me as brainliest

6 0

3 years ago

How come the arrow points the other direction when we look at it through a glass of water?

melomori [17]

Reflection changes the way the light hits our eyes, changing the direction.

5 0

4 years ago