PHYSICS HIGH SCHOOL

The first American to orbit the earth was:Frank Borman
Buzz Aldrin
Neil Armstrong
John Glenn

Answers

Answer 1
Answer: John Glenn is the first American to orbit the Earth.

♡♡Hope I helped!!! :)♡♡
Answer 2
Answer:

Yes, John Glenn was the first to orbit the earth but the question I read was who WALKED ON THE MOON.....the answer to who was the FIRST to walk on the moon... is  Neil Armstrong but Buzz Aldrin also walked and was there with Armstrong but wasn't the first.  You have to be careful about the astronaut 'firsts'.  Alan Shepherd was the first in space....John Glenn was the first to orbit the earth....Edward White was the first to 'walk in space' and Neil Armstrong was the first man to walk on the moon. Also remember that all of these were American Astronaut firsts.  The Russians actually put up the first man in space.  Yuri Gagarin was the first man.  Buzz Aldrin landed and walked on the moon also.

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The gravitational force between two objects is F. If masses of both the objects are halved without altering the distance between them, the gravitational force would become: Option a) F/4 Option b) F/2 Option c) 2F Option d) F^2
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Which of these statements about resistance is true? Choose the best answer.A. The greater the resistance, the easier it is for electricity to flowB. The greater the resistance, the less thermal energy is produce.C. The greater the resistance, the more electrical energy is produced.D. The greater the resistance, the more electrical energy is produced.
Stable system where forces cancel eachother out
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What are the two systems of measurement

Answers

The Metric, and the US Standard systems. :)

Why is it important to define a frame of reference?a. An observer cannot be moving.
b. Motion must be defined relative to something.
c. It's impossible to measure motion.
d. A stationary observer is always moving.

Answers


Motion must be defined relative to something.

Here's an obvious, everyday example:

-- You're in a passenger jet, going to visit grandma on the
coast for the holidays.
-- You're sitting still in your seat, listening to some 'mp3's,
reading a book, and dozing off.
-- At the same time, people on the ground see you flying over
at almost 500 miles per hour.

Are you moving at 500 mph, or are you not moving at all ?

The answer is 'Yes. Both.'. It just depends on who's measuring your speed.

There's no such thing as your "real" speed.  Motion is always
relative to something.  Different reference = different speed.

It is important to define a frame of reference because motion must be defined relative to something. Hence option(b) is correct.

Further Explanation:

Frame of reference is a framework that is used for observation of physical phenomena. It consists of an observer, a coordinate system and positions with respect to the coordinate system.

(a)

Let us take an example of a trolley moving with velocity u and a man on the ground at rest.

Since, the man's velocity is zero, the relative velocity of trolley with respect to the man is u.

Now, if a man starts to run with speed u and speed of trolley increases to two times of initial velocity u i.e. 2u, the relative velocity of trolley with respect to man is (2u-u=u).

Here, in both the conditions, the relative velocity of trolley with respect to time is same.

Therefore, it is wrong to say that an observer cannot be moving. Hence, option(a) is incorrect.

(b)

Let us take an example of a man on the ground at rest and a trolley moving with the velocity u having an object placed in it. The object will also moves with the velocity u.

For a man, trolley is moving with velocity u but for an object trolley is at rest because there is no relative motion between object and trolley.

Therefore, it is right to say that motion must be defined relative to something. Hence, option(b) is correct.

(c)

Let us take an example of a first object moving with velocity u and a second object moving with velocity v in the opposite direction and a third object is at rest.

The relative velocity of first object with respect to second object is (v+u) and the relative velocity of first object with respect to third object is v.

Here, the relative velocity of an object is different with respect to different object but all the motions are measurable.

Therefore, it is wrong to say that it's impossible to measure motion. Hence, option(c) is incorrect.

(d)

Let us take an example of two trains moving with same velocity in same direction.

Consider a man sitting in one train observes a man running in other train, then the man sitting is said to be stationary observer for the man running. Here, the man is stationary observer while in motion.

Now, if a man standing on the ground at rest will see the man on train, he will be called stationary observer. Here, the man is stationary observer while not in motion.

Therefore, it is wrong to say that a stationary observer is always moving. Hence, option(d) is incorrect.

Learn more:

1. Motion on a rough surface: brainly.com/question/7031524

2. Motion under the gravitational force: brainly.com/question/10934170

3. Principle of conservation of momentum: brainly.com/question/9484203

Answer Details:

Grade: High School

Subject: Physics

Chapter: Kinematics

Keywords:

Frame, reference, important, observer, motion, relative, velocity, speed, moving, measure, stationary, example, trolley, man and train.

A driver in a Volkswagen bug (mass = 1335 kg) pulls out going 10 miles per hour in front of a Ford pickup truck (mass = 2675 kg) which is traveling 40 miles per hour. The two vehicles experience a head-on collision. Which of the following statements is true concerning the forces that each vehicle (and driver) experience in this collision? a. The Volkswagen bug experiences a much greater force than the Ford pickup truck due to the greater speed of the truck.
b. The Volkswagen bug experiences a much greater force than the Ford pickup truck due to the larger mass of the truck.
c. The Volkswagen bug experiences a force that is the same as the Ford pickup truck experiences.
d. The Volkswagen bug experiences a much smaller force than the Ford pickup truck due to the smaller speed of the Volkswagen bug.
e. The Volkswagen bug experiences a much smaller force than the Ford pickup truck due to the smaller mass of the Volkswagen bug

Answers

Answer:C

Explanation:

Given

mass of Volkswagen m_1=1335 kg

speed of Volkswagen v_1=10 mi/hr

mass of Ford pick up m_2=2675 kg

speed of ford pick up v_2=40 mi/hr

When two bodies collide head-on then force experienced by both the bodies will be the same but opposite in direction.

According to newton's third law, the force exerted by one particle on another is equal to the force exerted by the second particle on first.

Thus two bodies will experience the same force              

Answer:

c. The Volkswagen bug experiences a force that is the same as the Ford pickup truck experiences.

Explanation:

Given:

mass of Volkswagen bug, m_v=1335\ kg

speed of Volkswagen bug,v_v=10\ mi.hr^(-1)

mass of Ford pickup, m_f=2675\ kg

speed of Ford pickup, v_f=40\ mi.hr^(-1)

Since both undergo a head-on collision they both face the equal impact in accordance with the Newton's third law of motion which states that every action has equal and opposite reaction.

So the bug the force applied by the bug on the pickup is equal to the force applied by the pickup on the bug. This happens only till both the masses are in contact with each other.

Fossil fuels currently account for the majority of the world’s energy use because they are A. distributed evenly throughout the world. B. nonpolluting. C. renewable energy resources. D. relatively inexpensive and readily available

Answers

Answer: D. relatively inexpensive and readily available

Fossil fuels are non-renewable sources of energy these resources formed by the geological processes occurring in the earth. It takes millions of years for their formation. These includes coal, petroleum, and natural gas. Unfortunately, the distribution of these resources is not even in the regions of the world but efforts have been done by the humans to make them available everywhere. They are relatively inexpensive and readily available this contributes to the majority of the world's energy use.

Fossil fuels currently account for the majority of the world’s energy use because they are relatively inexpensive and readily available.

In short, Your Answer would be Option D

Hope this helps!

What causes resistance in an electrical current

Answers

An electric current flows when electrons move through a conductor, such as a metal wire. The moving electrons can collide with the ions in the metal. This makes it more difficult for the current to flow, and causes resistance.

The three major scales used to measure earthquakes are Mercalli Scale, Richter Scale and Magnitude Scale.

Answers

The statement ‘The three major scales used to measure earthquakes are Mercalli Scale, Richter Scale and Magnitude Scale’ is true. These three scales used to measure the seismic waves released by the earthquake.

Answer:true

Explanation:
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