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3 years ago

What is the speed of a proton whose kinetic energy is 3.4 kev ?

1 answer:

8 0

The kinetic energy of the proton is 3.4 kev
1 kev = 1.602 × 10^-16 joules
therefore 3.4 kev is equivalent to;
3.4 × (1.602 ×10^-16)= 5.4468 × 10^-16 J
Kinetic energy is calculated by the formula 1/2mv² where m is the mass and v is the velocity.
Therefore V = √((2 × ( 5.4468×10^-16))/ (1.67 ×10^-27))
= 8.077 × 10^5 m/s

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In a 1.05-T magnetic field directed vertically upward, a particle having a positive charge of magnitude 6.50 * 10^-6C and initia

Flura [38]

Answer:

a. 25.59 μN b. The magnetic force is directed to the left.

Explanation:

a. The magnitude of the magnetic force

The magnetic force, F on the charge is

F = BqvsinФ where B = magnetic field strength = 1.05 T, q = charge = 6.50 × 10⁻⁶ C and v = speed of charge = 3.75 m/s and Ф = angle between B and v = 90° (since the charge is moving into the page and the magnetic field is directed vertically upwards and they are thus perpendicular to each other)

So, substituting the values of the variables into the equation, we have

F = BqvsinФ

F = 1.05 T × 6.50 × 10⁻⁶ C × 3.75 m/s × sin90°

F = 25.59 × 10⁻⁶ N

F = 25.59 μN

b. The direction of the magnetic force on the particle

Using Fleming's right-hand rule, the first finger represents the magnetic field and the second finger the direction of the charge(or its velocity), then the thumb represents the direction of the magnetic force on the charge. Since the magnetic field is directed vertically upwards and the particle is directed into the page, the magnetic force which is represented by the thumb is directed to the left.

So, the magnetic force is directed to the left.

5 0

3 years ago

A force is an effort needed to change the

tatyana61 [14]

Answer:

direction, speed, and shape of a body

Explanation:

8 0

3 years ago

Radio waves and microwaves are similar because they both have

tekilochka [14]

The correct answer is

b. low frequencies and low energy.

In fact, microwaves and radio waves have frequency up to $10^{10}-10^{11} Hz$ , which are really low compared, for instance, to the frequency of gamma rays ( $10^{20} Hz$ ). Moreover, the energy of an electromagnetic wave is directly proportional to its frequency:

$E=hf$

where h is the Planck constant and f the frequency; therefore, low frequency means also low energy.

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3 years ago

A wire loop is placed inside a magnetic field. the magnetic flux is maximized when the angel between the field lines and the sur

klasskru [66]

When magnetic field lines and surface area are perpendicular to each other.

6 0

3 years ago

Which motor and body should Devon use to build the car with the greatest acceleration?

PilotLPTM [1.2K]

Complete Question:

Devon has several toy car bodies and motors. The motors have the same mass, but they provide different amounts of force, as shown in this table.

The bodies have the masses shown in this table (refer attached figure).

Which motor and body should Devon use to build the car with the greatest acceleration?

motor 1, with body 1

motor 1, with body 2

motor 2, with body 1

motor 2, with body 2

Answer:

Devon should build the car with motor 2 and body 1 for having the greatest acceleration.

Explanation:

As per Newton's second law of motion, the acceleration of any object is directly proportional to the force on the object and inversely proportional to the mass of the object.

It can be seen that motor 2 has greater force than the force provided by motor 1. Similarly, the mass of body 1 is found to be lesser compared to mass of body 2. So,

$acceleration =\frac{\text { Force }}{\text { mass }}$

It gives, the system with motor 2 and body 1 the maximum acceleration. So the car should be built with motor 2 and body 1.

5 0

3 years ago

Read 2 more answers