PHYSICS MIDDLE SCHOOL

A 1 kg ball is thrown into the air with an initial velocity of 30 m/s. How much kinetic energy does the ball have?

Answers

Answer 1
Answer: Kinetic Energy = (1/2)mv²

m = 1kg,  v = 30m/s

Kinetic Energy =  (1/2) * 1 * 30 * 30 = 450 J
Answer 2
Answer:

Answer: 450 J

Explanation:

Kinetic Energy = 1/2 × mass × velocity²

Kinetic Energy = 1/2 × 1.0 Kg × 30 m/s²

Kinetic Energy = 1/2 × 1.0 Kg × 900

Kinetic Energy = 450 J

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The flat area surrounding the mouth of the Mississippi River is covered with rich sediments important to farming in this area. These sediments are deposited at a rate of 80,000 tons per year. This area surrounding Mississippi River is called the

Answers

Answer:

A) Delta.

Explanation:

The options of this question are the next ones:

A) delta. B) plains. C) plateau. D) low lands.

The flat area surrounding the mouth of the mississippi river is known as Delta, or the Delta Basin of the Mississippi river, and the entire area was formed over the curse of 5,000 years by the deposition when the sediments are being put into this delta.

commonly referred to as the Mississippi River DELTA. technically, it's an estuary.

why do you think accurate measurement of time became possible much after accurate measurement of length and mass

Answers

Accurate measurements of time become possible after accurate measurement of length and mass because time taken by a heavy body to move a certain distance is more,and time taken by a light body to move a certain distance is less.

I'm giving out a lot of points for whoever helps me and answers correctly! 3 questions to answer! Please answer them ALL!!! :D1 - Which of these is a good example of Newton's First Law of inertia?

A) A ball sits motionless on the ground
B) A ball gathers speed as it rolls downhill
C) A ball accelerates as it falls out of a classroom window
D) A ball returns to your hand after you throw it up in the air

2 - The space shuttle is located exactly half way between the earth and the moon. Which statement is true regarding the gravitational pull on the shuttle?

A) The moon pulls more on the shuttle
B) The earth pulls more on the shuttle
C) Both are equal due to equal distances
D) Both are equal due to the mass of the shuttle

3 - In which situation is the acceleration of the car negative?

A) The velocity of the car was 75/h over 4 hours
B) The velocity of the car reduced from 50 km/h to 35 km/h over one minute
C) The velocity of a car increased from 40 km/h to 75 km/h over 15 minutes
D) The velocity of a car was 45 km/h at 2:00 pm and at 4:00 pm the velocity of the car was 85 km/h

Answers

1. A) A ball sits motionless on the ground

Newton's First Law of inertia states that:

"When the forces acting on an object are balanced, the object stays at rest (if it was at rest) or continues its motion with constant velocity (if it was in motion)"

Among the options given, we see that the option

A) A ball sits motionless on the ground

is an example of this law: in fact, the ball sits at rest on the ground, the forces acting on it are balanced, so the ball stays at rest.

2. B) The earth pulls more on the shuttle

The gravitational attraction exerted by a planet on the shuttle is given by

F=G(Mm)/(r^2)

where

G is the gravitational constant

M is the mass of the planet

m is the mass of the shuttle

r is the distance between the shuttle and the planet

In this problem, we are comparing the gravitational pulls exerted by the Earth and the Moon on the shuttle. The distance, r, is the same (because the shuttle is half-way), the mass of the shuttle m is the same, and G is the same. However, the mass of the Earth is greater than the mass of the Moon, so in the formula M is greater for the Earth: therefore, the Earth pulls more on the shuttle.

3. B) The velocity of the car reduced from 50 km/h to 35 km/h over one minute

The acceleration of the car is defined as the ratio between the change in velocity and the time taken:

a=(v_f-v_i)/(\Delta t)

where vf is the final velocity, vi is the initial velocity, and \Delta t is the time taken.

In order to have a negative acceleration, the numerator must be negative: this means that the initial velocity, vi, must be greater than the final velocity, vf, and this situation occurs in option B), since the initial velocity is 50 km/h while the final velocity is 35 km/h.

1-a 2-b 3-b    

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What are the four most common gases in dry air?

Answers

The four most common gases in dry air are nitrogen, oxygen, carbon dioxide, and water vapor.

The four most common gases in dry air are nitrogen, oxygen, carbon dioxide, and water vapor.

Nitrogen is the most abundant gas in dry air, making up about 78.6% of the air.

Oxygen is the second most abundant gas, accounting for approximately 20.9% of the air.

Carbon dioxide is present in small amounts, around 0.04%, but it plays an important role in the Earth's carbon cycle and climate. Water vapor, despite being a variable component, can make up around 0.5% of the air.

Learn more about common gases in dry air here:

brainly.com/question/36340201

#SPJ6
nitrogen
oxygen
argon
carbon dioxide

Thermal energy is transferred as heat from a warmer object to a cooler object until Select one: a. all of the energy from the hot object is transferred to the cold object. b. the temperature is the same in both objects. c. all of the energy from the cold object is transferred to the hot object. d. the thermal energy is converted into another type of energy such as light.

Answers

Answer: Option B

Explanation:

When the thermal energy is transferred from a hotter body to the colder body then the transfer of energy takes place until the temperature of both the objects are same.

The energy from the hotter body is transferred to the colder body. Example: The heat transfer from the hotter water takes place into the colder water.

The energy transfer will stop only when the temperature of both the water will be same.

I'm like 98% it's D.

What do you think scientists classify blood as a connective tissue?

Answers

Blood is a fluid connective tissue because its found in all the internal organs and its is also connect two or more organs like tissue with heart
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