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4 years ago

A stock person at the local grocery store has a job consisting of the following five segments:

Physics

1 answer:

vaieri [72.5K]4 years ago

6 0

Answer:

Explanation:

Work done can be said to be positive if the applied force has a component to be in the direction of the displacement and when the angle between the applied force and displacement is positive.

In 1 and 2 work done is positive

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Urgent please help me

Verizon [17]

1433 km

Explanation:

Let g' = the gravitational field strength at an altitude h

$g' = G\dfrac{M_E}{(R_E + h)^2}$

We also know that g at the earth's surface is

$g = G\dfrac{M_E}{R_E^2}$

Since g' = (2/3)g, we can write

$G\dfrac{M_E}{(R_E + h)^2} = \dfrac{2}{3}\left(G\dfrac{M_E}{R_E^2} \right)$

Simplifying the above expression by cancelling out common factors, we get

$(R_E + h)^2 = \dfrac{3}{2} R_E^2$

Taking the square root of both sides, this becomes

$R_E + h = \left(\!\sqrt{\dfrac{3}{2}}\right) R_E$

Solving for h, we get

$h = \left(\!\sqrt{\dfrac{3}{2}} - 1\right) R_E= 0.225(6.371×10^2\:\text{km})$

$\:\:\:\:\:= 1433\:\text{km}$

5 0

3 years ago

What would happen if there were no enzymes in the human body?

MakcuM [25]

Answer:

Explanation:wwwwwwwwwwwwwwwwwwwwww

6 0

3 years ago

Read 2 more answers

If you were asked how to evaluate scientific evidence, what would you would want to include in your answer?

raketka [301]

You would want to include qualitative and quantitative evidence

6 0

4 years ago

The Sears Tower is nearly 400 m high. How long would it take a steel ball to reach the ground if dropped on the top? What will b

kipiarov [429]

Answers:

a) 9.035 s

b) -88.543 m/s

Explanation:

The described situation is related to vertical motion (especifically free fall) and the equations that will be useful are:

$y=y_{o}+V_{o}t+\frac{1}{2}gt^{2}$ (1)

$V=V_{o}+gt$ (2)

Where:

$y=0$ is the final height of the steel ball

$y_{o}=400 m$ is the initial height of the steel ball

$V_{o}=0$ is the initial velocity of the steel ball (it was dropped)

$V$ is the final velocity of the steel ball

$t$ is the time it takes to the steel ball to reach the ground

$g=-9.8 m/s^{2}$ is the acceleration due to gravity

<u>Knowing this, let's begin with the answers:</u>

<h2>a) Time it takes the steel ball to reach the ground</h2>

We will use equation (1) with the conditions listed above:

$0=y_{o}+\frac{1}{2}gt^{2}$ (3)

Isolating $t$ :

$t=\sqrt{\frac{-2y_{o}}{g}}$ (4)

$t=\sqrt{\frac{-2(400 m)}{-9.8 m/s^{2}}}$ (5)

$t=9.035 s$ (6)

<h2>b) Final velocity of the steel ball</h2>

We will use equation (2) with the conditions explained above and the calculaated time:

$V=gt$ (7)

$V=(-9.8 m/s^{2})(9.035 s)$ (8)

$V=-88.543 m/s$ (9) The negative sign indicates the direction of the velocity is downwards

3 0

3 years ago

finally, remind yourself the properties of light from the first lecture and qs1. if instead of pulses, the astronaut had sent a

hjlf

Although the green light flashes first, you are moving away from it, so it illuminates you at the same moment as the red light.

A green laser is frequently used by amateur astronomers because its visible beam may be used to point out stars and galaxies because it penetrates the atmosphere so far. Red lasers are less adaptable than green lasers. Each wave or component of light in a laser has been precisely aligned to form a single, strong beam.

Green DPSS lasers are the most popular and first emerged on the market about 2000. (also called diode-pumped solid-state frequency-doubled, DPSSFD). Due to the rarity of laser diodes in this wavelength region, they are more complicated than regular red laser pointers.

Green lasers have been used in head-mounted displays and laser guides for defense and security purposes. Amateur astronomers can also direct and track stars using green laser guides.

To learn more about a green light. Please visit the below link.

brainly.com/question/4503557

#SPJ4

7 0

1 year ago