PHYSICS MIDDLE SCHOOL

17. Which of the following is the closest weight in newtons of a 7.0-kilogrambowling ball? *
A. 7.0 newtons
B. 70 newtons
C. 700 newtons
d. 7000 newtons

Answers

Answer 1

Answer:

Weight = (mass) x (gravity)

Weight = (7.0 kg) x (gravity)

On Earth, where (gravity) is roughly 10 N/kg . . .

Weight = (7.0 kg) x (roughly 10 N/kg)

Weight = roughly 70 Newtons

That's B on Earth.

It would be some other number on other bodies.

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The method of heat transfer that plays a central role in transferring heat energy within the atmosphere and the ocean is A. convection. B. radiation. C. conduction. D. reflection.

Which of the following are early clues that signal an earthquake may occur? Select all that apply. Changes in magnetic properties of rock Movement of magma Decrease in well water levels Increase in sulfur dioxide and carbon dioxide ground emissions Increases in radon gas in groundwater Foreshocks

Answers

The following answers apply;

Changes in magnetic properties of rock
Decrease in well water levels
Increases in radon gas in groundwater
Foreshocks

These other choices may be good indicators of an imminent volcanic eruption;

Movement of magma

Increase in sulfur dioxide and carbon dioxide ground emissions

Answer:

correct order for early clues that notify about earthquake is:

$\rightarrow$ change in magnetic properties of rock

$\rightarrow$ Decrease in water levels in well

$\rightarrow$ increase in the amount of radon gas in subsurface water foreshocks

Explanation:

correct order for early clues that notify about earthquake is:

$\rightarrow$ change in magnetic properties of rock

$\rightarrow$ Decrease in water levels in well

$\rightarrow$ increase in the amount of radon gas in subsurface water foreshocks

The other that can take place the position of clues for volcanic eruption are

$\rightarrow$ Movement of magma

$\rightarrow$ increase in SO_2 and CO_2 emission from grounds

Which test is performed by a-radiologist?

Answers

Your radiologist is a medical doctor who specializes in diagnosing and treating disease and injury, using medical imaging techniques such as x-rays, computed tomography (CT), magnetic resonance imaging (MRI), nuclear medicine, positron emission tomography (PET), fusion imaging, and ultrasound.

Final answer:

A radiologist performs multiple tests including radiography (X-rays), MRI, CT scans, and ultrasounds to diagnose and treat various diseases and injuries.

Explanation:

A radiologist is a medical doctor specialized in diagnosing and treating diseases and injuries using medical imaging procedures. One of the key tests performed by a radiologist is a radiography, also known as X-ray. In this test, a small amount of radiation is used to produce images of the inside of the body. They also perform other tests such as Magnetic Resonance Imaging (MRI), Computed Tomography (CT) scans, and ultrasounds, depending on the nature of the patient's condition.

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How can one object affect the motion of another without touching it? Give a specific example.

Answers

There are two types of forces

1. Physical force : in this type of forces we require direct contact between two bodies

2. Field force: here we do not requires any type of physical contact with the body

so here in this type of field force we do not required any contact but only due to field present near it the body can move

so here several examples are there

a) when a magnet is placed near a piece of iron then it will move towards the iron

b) a positively charged particle when come near another charged particle then it will get attracted or repelled.

so as per all above discussion we can say that an object can move without any direct contact

Final answer:

Objects can affect the motion of others without touching through the force of gravity. For example, the Moon affects the tides on Earth.

Explanation:

One way that an object can affect the motion of another without touching it is through the force of gravity. Gravity is a long-range force that acts between all objects with mass. For example, the Moon affects the motion of the tides on Earth without physically touching the water.

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Starting from rest, Christina experiences 24.5 m/s2 of acceleration to take off from an aircraft carrier for 5 seconds. How long does the runway need to be? Round to the nearest meter.

Answers

Answer:

The length of the runway to the nearest meter is 306 m.

Explanation:

Given:

Initial velocity of Christina is, $u=0\ m/s(Rest)$

Time taken is, $t=5\ s$

Acceleration experienced by Christina is, $a=24.5\ m/s^2$

The length of the runway is, $d=?$

Now, we use Newton's equation of motion that relates the distance, initial velocity, time and acceleration.

So, we have the following equation of motion:

$d=ut+(1)/(2)at^2$

Plug in all the given values and solve for 'd'. This gives,

$d=0+(1)/(2)* 24.5* 5^2\n\nd=(1* 24.5* 25)/(2)\n\nd=(612.5)/(2)\n\nd=306.25\approx 306\ m(\textrm{Rounding to nearest meter})$

Therefore, the length of the runway to the nearest meter is 306 m.

Which action will result in a product with new chemical properties?A. shredding a newspaper

B. breaking a mirror

C. cutting wood

D. popping popcorn

Thanks :)

Answers

Popping popcorn action will result in a product with new chemical properties, therefore the correct answer for the given problem is option D.

What is a chemical reaction?

In a chemical reaction, one or more components referred to as reactants—are changed into one or more other substances—also referred to as byproducts.

A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

The energy of the reactant is greater than the energy of the product because the extra energy is released during an exothermic reaction.

Popcorn would be the best choice since it would transform the pre-popped kernels into something else whereas the other options would merely change their outward look.

Thus, popping popcorn action will result in a product with new chemical properties, therefore the correct answer for the given problem is option D

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the answer would be popping popcorn because while you are changing the physical appearance in the rest of the choices only popping the popcorn would turn the prepopped kernels into something else

Which type of volcano forms when eruptions contain mostly dust, ash, and cinders?composite cone volcano
cinder volcano
hot vent volcano
shield volcano