PHYSICS HIGH SCHOOL

Gravity is a force of attraction between objects that is due to their weight and height between one another. a. True
b. False

Answers

Answer 1
Answer: The statement above is false. The statement should be: "Gravity is a force of attraction between objects that is due to their masses." Mass and weight are often interchanged. Gravitational force depends on the masses of objects, but the size of this force is what weight is. So the relationship is:

Weight = mass x gravitational constant = mass x 9.81 m/s^2

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Heterotrophs convert solar energy into chemical energy.a. Trueb. False
Which atomic number is the threshold value below which fusion may occur?
You are standing 100 Meters away from your car when an alligator appears 20meters away from you on the opposite side and you start to run with a speed of 5m/s while the alligator's speed was 8m/s towards you. Will you reach your car before the alligator reaches you? Why?

Most meteor showers are associated with the orbits of

Answers

comets.

Small fragments of meteors, formed by ice and rock mixed consitute the comets.

The answer is B) comets.

What effect did the Cold War have on the American space program?A. High levels of military spending deterred scientific research.
B. The need for nuclear weapons led to less sophisticated rocket technology.
C. American and Soviet scientific cooperation lessened political tension.
D. Competition with the Soviet Union spurred American space missions

Answers

The answer is D.Competition with the Soviet Union spurred American space missions.

♡♡Hope I helped!!! :)♡♡

Competition with the Soviet Union spurred American space missions.

Which of the following best describes a direct current

Answers

Direct current-is  the unidirectional flow or movement of electric charge carries(which are usually electrons.  
its an unidirectional flow of electric charge

hope this helps!

How does a scrap heap magnet work? (In detail)

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is nothing but a heavy electromagnet. On a soft iron core (because, there should not be any retentivity) thick insulated copper wire is wound. As the magnetic power of an electromagnet is depending upon the current, number of turns in the coil, the copper wire should be able to withstand heavy current and more number of turns will create very strong magnetic field. When the current passes it will become a very strong magnet and will attract all the magnetic materials in the scrap. When there is no current the core gets dememagnetised and all the magnetic materials will be falling down from it . This arrangement is fitted at the tip of the cable of a crane and the operating switch will be near the operators cabin. The crane will be brought near the scrap, and the operator switch the magnet on and all the scrap will be attracted by the magnet. Then the crane will be turned to another place the operator switches the magnet off. All the scraps will be falling down. 
Instead of a soft iron core ( less retentivity) anyother material with high retentivity is used even after switching it off the scrap will not bec falling down.

Which of the following can be an organic cause of chemical weathering?A. loess
B. lichen
C. freezing
D. expansion

Answers

the answer would be B i just did this 3 days ago
the answer is B or C because the weather can cause freezing 

A child is sending pulses down a stretched rope at a rate of 2 pulses per second. The distance between the pulses is 5 meters. What is the speed of the wave?a. 5 m/s
c. 2 Hz
b. 10 m/s
d. 2.5 m/s User: Longitudinal seismic waves are known as
a. primary waves.
b. secondary waves.
c. surface waves.
d. transverse waves.

Answers


Wave speed  =  (wavelength) x (frequency)

                       =     (5 meters)  x  (2 per second)

                       =        10 meters per second .
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The gas-phase reaction between nitrogen and oxygen was carried out in a device designed to maintain constant pressure. There are two cylinders of equal volume with a reaction arrow between them. The cylinder on the left has two molecules of O 2 and two molecules of N 2. The cylinder on the right has four molecules of N O. A constant pressure is applied to both cylinders Write the balanced chemical equation for the reaction between nitrogen oxygen. Include physical states.
A string is wrapped around a pulley with a radius of 2.0 cm. The pulley is initially at rest. A constant force of 50 N is applied to the string, causing the pulley to rotate and the string to unwind. If the string unwinds 1.2 m in 4.9 s, what is the moment of inertia of the pulley
Which force is always pulling but never pushes and is directly influenced by mass
A boy throws a ball and accidentally breaks a window. The momentum of the ball and all the pieces of glass taken together after the collision is ________ the momentum of the ball before the collision