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2 years ago

What is the mass of a car that weighs 19,000 N on earth?

Physics

1 answer:

Anna71 [15]2 years ago

8 0

Divide by 9.8 I think
so 1938.77551

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An electric field of 2.09 kV/m and a magnetic field of 0.358 T act on a moving electron to produce no net force. If the fields a

My name is Ann [436]

Answer:

The velocity is $v = 5838 \ m/s$

Explanation:

From the question we are told that

The electric field is $E = 2.09 kV/m = 2.09 *10^{3} \ V/m$

The magnetic field is $B = 0.358 \ T$

Generally the force experienced by the electron due to the magnetic field is

$F_m = qvB$

Generally the force experienced by the electron due to the electric field is

$F_e = qE$

Since from the question the net force is zero then

$F_e = F_m$

=> $v = \frac{E}{B}$

Substituting values

$v = \frac{2.09*10^{3}}{0.358 }$

$v = 5838 \ m/s$

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2 years ago

In comparing the Ptolemaic system to the Copernican system, neither is entirely correct since Ptolemy said the earth was at the

Nikitich [7]

In comparing the Ptolemaic system to the Copernican system, neither is entirely correct since Ptolemy said the earth was at the center and Copernicus said the planets had circular orbits. This is correct

5 0

2 years ago

Air resistance is a fluid type of friction. TRUE OR FALSE

Ne4ueva [31]

Answer:

True

Explanation: Air resistance (also called drag) is a type of frictional force. Like all frictional forces, the force of air resistance always opposes the motion of an object. Usually, the air resistance force is not very strong.

5 0

2 years ago

Which of the following represents a system that is completely open

Softa [21]

The boiling pot of water is completely open

4 0

2 years ago

Read 2 more answers

A sewing machine needle moves in simple harmonic motion with a frequency of 2.5 Hz and an amplitude of 1.27 cm. (a) How long doe

Alborosie

Answer:

The tip of the needle to move from the highest point to the lowest point in 0.4 sec and the needle tip to travel a total distance in 0.9 sec.

Explanation:

Given that,

Frequency = 2.5 Hz

Amplitude = 1.27 cm

(a). We need to calculate the time

The frequency is the reciprocal of the time.

$f=\dfrac{1}{T}$

$T=\dfrac{1}{f}$

$T=\dfrac{1}{2.5}$

$T=0.4\ sec$

The time taken from highest point to lowest point

$T'=\dfrac{T}{2}$

$T'=\dfrac{0.4}{2}$

$T'=0.2\ sec$

(b). We need to calculate the time

The time taken in one cycle = 0.4 sec

The distance covered in one sec= 4 times x amplitude

$d=4\times1.27$

$d=5.08\ m$

We need to calculate the speed

Using formula of speed

$v=\dfrac{5.08}{0.4}$

$v=12.7$

We need to calculate the time

$t=\dfrac{11.43}{12.7}$

$t= 0.9 sec$

Hence, The tip of the needle to move from the highest point to the lowest point in 0.4 sec and the needle tip to travel a total distance in 0.9 sec.

6 0

2 years ago