PHYSICS MIDDLE SCHOOL

Tectonic plates are large segments of the earth's crust that move slowly. Suppose one such plate has an average speed of 6.0 cm per year.(a) What distance does it move in 25 seconds at this speed?
What's the formula for this problem?

Answers

Answer 1

Answer:

For this problem, we use the following expression:

Speed = distance / time

Distance = Speed * time

Since the problem tells us the speed of the plates, we know that

Speed_plates = 6.0 cm/year

Which is equal to

Speed_plates = 6.0 cm/365 days = 6.0 cm/(365*24 hours)

Speed_plates = 6.0 cm/(365*24*60 minutes)

Speed_plates = 6.0 cm/(365*24*60*60 seconds)

Speed_plates = 190.258 E -9 cm / s

We multiply by 25, to get the distance traveled after 25 seconds

Distance traveled = 4.756 E-6 cm

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A graduated cylinder is filled to an initial volume of 12.7 ml. A rock Is dropped into the graduated cylinder. The final volume of the graduated cylinder is 18.2ml. What is the Rocks volume in both ml and cm3? What method was used to determine this?

Answers

Answer:

V = 5.5 mL

Explanation:

The volume filled in the graduated cylinder is 12.7 mL

now when a stone is dropped into the cylinder then the volume of liquid is raised to final level of 18.2 mL

so as per the theory of given by Archimidies we can say that the volume of the object is exactly same as the volume displaced by the object

So here the volume displaced by the object is given as

$V_(displaced) = V_f - V_i$

$V_(displaced) = 18.2 mL - 12.7 mL$

$V_(displaced) = 5.5 mL$

so the volume of the object is given as

$V = V_(displaced)$

$V = 5.5 mL$

First of all, ml and cm^3 are equal. The volume of the rock is 5.5 ml. This is found by subtracting the volume of just the water from the combined volume of the rock and the water leaving you with just the volume of the rock. This is method is using water displacement.

Ii. At what height would the steel beam have a gravitational potential energy of 100,000 J? (1

Answers

The height of the steel beam is 30.9 m

Explanation:

The gravitational potential energy of an object is the energy possessed by an object due to its position in the gravitational field. Near the Earth's surface, the gravitational potential energy of an object is given by

$U=mgh$

where

m is the mass of the object

g is the acceleration of gravity

h is the height of the object above the ground

For the steel beam in this problem, we have:

U = 100,000 J is the potential energy

m = 330 kg is the mass

$g=9.8 m/s^2$

Solving for h, we find the height of the steel beam:

$h=(U)/(mg)=(100,000)/((330)(9.8))=30.9 m$

Learn more about gravitational potential energy:

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Early in the history of geology, scientists debated two different views of how geologic processes work. These two ideas became known as uniformitarianism and catastrophism. Which of the following correctly describes the view of catastrophism?A.) Geologic changes only occur in sudden, devastating events.

B.) Geologic changes only occur because of slow, gradual processes.

C.) Geologic changes can be either sudden or gradual.

D.) Geologic changes can quickly change Earth's structure.

Answers

A.) Geologic changes only occur in sudden, devastating events.

Choose all the answers that apply. In pea plants, round seeds are dominant over wrinkled seeds. If two hybrids (Rr) are crossed: 50 percent will be Rr
25 percent will have round seeds
25 percent will have wrinkled seeds
1/4 will have round seeds
3/4 will have the same phenotype

I REALLY NEED HELP PLEASE

Answers

50 percent will be Rr

25 percent will have wrinkled seeds

The following information should be considered:

In the case when there is peaplants, roundseeds are dominant over wrinkled seeds.
So at the time of two hybrids are crossed so there should be 50% as Rr and 25% should be wrinkled seeds.

learn more: brainly.com/question/18269454?referrer=searchResults

Correct answers:

50 percent will be Rr
25 percent will have wrinkled seeds

| R | r
----------------
R | RR| Rr
---|------------
r | Rr | rr

Newton's _____ Law states that an object's acceleration is directlyrelated to the net force applied and inversely related to the mass of the object.

Answers

Answer:

Newton's second Law states that an object's acceleration is directly related to the net force applied and inversely related to the mass of the object.

Explanation:

Newton's second law states that when force is applied on an object, then it causes acceleration which is directly dependent on the net force applied and varies inversely with the mass of the object.

This law gives us the following equation:

$F=ma$