If a solid is 180g what is the density

Answers

Answer 1

Answer:
If a lump of something has 180g of mass,
then its density is

(180g) / (its volume in cm³) .

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1. A teacher challenges.students to study moon phases to determine if what they have learned from the textbook is accurate. How might a student investigate claims made in a textbook that moo. phases occur in a 28-day cycle?
A. observe the phase of the moon each night until a full moon can be seen.
B. Compare the textbook phases to the actual moon phases seen in the night sky each night in 28 days periods over a three month time frame.
C. Compare diagrams of moon phases from the textbook to diagrams of moon phases on-line
D. Observe the moon phases seen in the night sky as often as possible over a six month period.

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thank you

Answers

1. I think you should compare diagrams of moon phases from the textbook to diagrams of moon phases online. Because if you pick D it will take to long and C will help you out whith 3 different things to look at.

2. The moon changes in appearances from the perspective of people on earth because it's revolving around the planet and the earth is revolving around the sun, so A. Hoped this helped.

a cannon ball is fired at 40 degrees with an initial velocity of 180 m/s. what is the maximum height reached by the cannonball?

Answers

A ball is fired with speed v = 180 m/s at an angle 40 degree

So here we can say the components of velocity is given as

$v_(x) = 180 cos40 = 137.9 m/s$

$v_y = 180 sin40 = 115.7 m/s$

now when ball will reach the maximum height its velocity in vertical direction will become zero

so here we can say

$v_(fy) = 0$

now using kinematics we will have

$v_(fy)^2 - v_y^2 = 2 a d$

$0 - 115.7^2 = 2(-9.8)(H)$

so maximum height is

$H = 683 m$

so it will reach at maximum height of 683 m

A candy bar supplies your muscles with energy. If your muscles are 40% efficient, how much work can they perform if the candy contains 800 J?

Answers

Answer:

The muscles can perform 320 J of work.

Explanation:

Let the work performed by the muscles be $W_(out)$ J.

Efficiency of a body is given as the ratio of useful work to that of work supplied.

Here, the work provided by the candy bar is, $W_(in)=800\ J$

Efficiency of the muscles is, $\eta =40\%=0.40$

Now, we know that,

$\textrm{Efficiency,}\ \eta=(W_(out))/(W_(in))\n0.40=(W_(out))/(800)\nW_(out)=0.40* 800=320\ J$

Therefore, the work performed by the muscles is 320 J.

A child is stationary on a swing. The child is given a push by his brother to start him swinging. His brother applies a steady force of 84 N over a distance of 0.25 m. Calculate the work done by this force.

Answers

The formula is M=Fd
so we have F=84N and d=0.25m
Now we just replace F and d into the formula M=84N×0.25m
And the last thing we do is calculate it
M=21Nm

What is the right ascension and declination of spica

Answers

Spica
RA . . . 13h 25m 11.579s
Dec . . . −11° 09′ 40.75″

A rock collection comes from which part of Earth?

Answers

Answer:

Crust

Explanation:

Rock is a solid mass, a collection of minerals which occur naturally. There are three different types of rocks- Igneous, Sedimentary and Metamorphic. These vary in texture and composition. The rocks come from the upper most layer of the Earth- the crust. Heat, pressure, volcanoes, wind and water play important role in formation of rocks.

Answer:

rocks form from the outer solid layer of the earth which is the crust

Explanation:

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