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vodomira [7]
4 years ago
5

Explain how you would use a reference point to describe the position of an object

Physics
1 answer:
11Alexandr11 [23.1K]4 years ago
3 0
Best Answer: You need a reference point because all motion is defined relative to a point which is taken to be fixed. For example, when you say that a car is moving at 20 m/s, you mean that it's moving at 20 m/s relative to the ground, which you assume to be a fixed point. However, you also know that the ground (and the Earth) are really zipping through space at high speed as we orbit the Sun. If you want to define the car's speed relative to the Sun, you have to take the Earth's motion into account as well. Whenever you define the motion of an object on or above Earth, it's usually understood that the ground if your reference point. If it's not, you should specify another point.

Speed is a scalar quantity, which means that it only tells you how fast an object is moving. Velocity is a vector quantity: it tells you how fast an object is moving AND in what direction. For example, I might say that a car is moving at 20 m/s. That's the car's speed. But if I say that the car is moving at 20 m/s NORTH, then I've given you its velocity.

In velocities, direction can be given in several different ways:

(A) As a positive or negative sign. Example: The rocket is moving at +250 m/s. In this case, we've defined "up" as the positive direction and "down" as the negative direction.

(B) As an angle or compass heading. Example: The plane took off at 100 m/s 20º above the horizontal OR the car is driving at 30 m/s due west.
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A beam of protons is directed in a straight line along the +z direction through a region of space in which there are crossed ele
IceJOKER [234]

Answer:

B = 7.6 T   direction of + x

Explanation:

For the proton beam to continue in the same direction the electric and magnetic forces must be equal

              F_{m} - F_{e} = 0

              F_{m} = F_{e}

              Fm = q E

             

The electric force is in the direction of the electric field because it is the charge of the positive proton, the electric force goes in the direction of –y, therefore, the magnetic force cancels this force must go in the direction of + y

 The magnetic force is

             F_{m} = q v x B = q v B sin θ

             θ = 90

             B = q E / q v

             B = E / v

             B = 800/105

             B = 7.6 T

To find the direction of the magnetic field we use the right hand rule, the thumb goes in the direction of the proton velocity, the fingers extended in the direction of the magnetic field and the palm is the direction of force, for a positive charge.

Thumb goes in the direction of the + z axis

Palm in the direction of +y

Fingers point in the direction of + x

7 0
3 years ago
If matter cannot be created nor destroyed the how was matter created
Assoli18 [71]
It can’t be created nor destroyed although it can be changed from one form to the other

I hope this helps

Have a happy holidays:)
7 0
3 years ago
Sound waves strike a glass and cause it to shatter.
e-lub [12.9K]
1. Resonance. Mechanical waves act on or through a medium, these waves can often have frequencies that are synchronized in a way that makes them act on the matter in the medium more "aggressively."
3 0
3 years ago
A small charged sphere is attached to a thread and placed in an electric field. The other end of the thread is anchored so that
VMariaS [17]

Answer:

E = 9.66\times 10^{-6} N/C

direction is Horizontal

Explanation:

As we know that the string is horizontal here

so the tension force in the string is due to electrostatic force on it

now we will have

F = qE

so here the force is tension force on it

F = 6.57 \times 10^{-2} N

Q = 6.80 \times 10^3 C

now we have

6.57 \times 10^{-2} = (6.80 \times 10^3)E

E = 9.66\times 10^{-6} N/C

direction is Horizontal

4 0
4 years ago
2.<br> The inertia of an object depends on its
denis23 [38]

Answer:

Inertia of an object depends on the <em>mass </em>of the object.

Explanation:

Inertia is the property that is possessed by a matter( anything that has weight and occupies space) that enables it to be at rest or in a state of continuous uniform motion.

<em>The inertial of a body is the resistance that is present in the body, that forces acting on the body have to overcome for the body to move or continue moving.</em><em> </em>

The inertia of a body depends on the mass of such a body, which is directly proportional. The mass of an object is the measure of inertia,  the bigger the mass of an object the bigger the inertia.

<em>Therefore the Inertia of an object is largely dependent on the mass of such an object. </em>

6 0
4 years ago
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