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2 years ago

An object has a mass of 30 grams and measures 3cmx2cmx1cm. What is the density of the object?

1 answer:

4 0

The density of the object is the ratio of its mass and volume. From the given dimensions above, we determine the volume through the equation,

V = L x W x H

Substituting,

V = (3 cm)(2 cm)(1 cm) = 6 cm³

From the idea presented above,
d = m/V

Substituting the known values,

d = (30 g)/ (6 cm³) = 5 g/cm³

ANSWER: 5 g/cm³

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The acceleration reaches its minimal value of zero at the top of the trajectory. *

Serhud [2]

it is true. the trajectory reaches the value of zero at the top

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2 years ago

An object is located 50 cm from a converging lens having a focal length of 15 cm. Which of the following is true regarding the i

crimeas [40]

Answer:

It is real, inverted, and smaller than the object.

Explanation:

Let's start by using the lens equation to find the location of the image:

$\frac{1}{q}=\frac{1}{f}-\frac{1}{p}$

where we have:

q = ? is the distance of the image from the lens

f = 15 cm is the focal length (positive for a converging lens)

p = 50 cm is the distance of the object from the lens

Solving the equation for q, we find

$\frac{1}{q}=\frac{1}{15 cm}-\frac{1}{50 cm}=0.047 cm^{-1}$

$q=\frac{1}{0.047 cm^{-1}}=+21.3 cm$

The sign of q is positive, so the image is real.

Now let's also write the magnification equation:

$h_i = - h_o \frac{q}{p}$

where

$h_i, h_o$ are the size of the image and of the object

By substituting p = 50 cm and q = 21.3 cm, we find

$h_i = - h_o \frac{21.3 cm}{50 cm}=-0.43 h_o$

So we notice that:

$|h_i| < |h_o|$ : this means that the image is smaller than the object

$h_i < 0$ : this means that the image is inverted

so, the correct option is:

It is real, inverted, and smaller than the object.

7 0

2 years ago

A tennis ball is thrown straight up into the air with an initial velocity of 38 m/s.

geniusboy [140]

Answer:

a) 3.9s

b)74m

Explanation:

a) v=u+at

0=38+(-9.8)t

-38=-9.8t

t=-38/-9.8

t=3.877s

t=3.9s

b) s=ut+1/2at²

s=(38×3.9)+1/2(-9.8×3.9²)

s=148.2 -74.529

s=73.671

s=74m

8 0

2 years ago

How can you recognize the potential greatness in others?

Nikolay [14]

Answer:

heres some ways i personally think might help!

Explanation:

Have a Compelling Vision. Your vision must be larger than yourself and larger than the moment, says world-famous business guru Tony Robbins. ...

Build Collaboration.

Be Focused.

Innovate.

Use Emotional Intelligence.

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Service. To be of real service in this world, we must add something to other people's lives that cannot be bought. ...

Results. Getting the results we desire comes from how hard we work and how optimistic our outlook is.

Efficiency.

Quality.

Reliability.

Catch People Doing Something Right. ...

Recognize Effort and Hard Work, not Intelligence. ...

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5 0

2 years ago

If the angle of incidence is 30°, degrees what is the angle of reflection?

algol13

Answer:

Angle of reflection = 30°

Explanation:

One of the laws of reflection is that the angle of incidence is equal to the angle of reflection.

The angle at which the light strikes the mirror is called the angle of incidence while the angle at which the light gets reflected back is called angle of reflection.

In this case, the angle of incidence is 30 degrees. So, we can say that the angle of reflection is also equal to 30 degrees.

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2 years ago