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4 years ago

U

Physics

1 answer:

katen-ka-za [31]4 years ago

8 0

Answer: B = 0.1 Tesla

Explanation: Given that the

Emf = 6.0 V

Length L = 30 m

Speed V = 2 m/s

B = ?

The induced EMF = BVL

6 = 30 × 2 × B

B = 6/60

B = 0.1 Tesla

The magnetic field B = 0.1 Tesla.

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You are standing on a bathroom scale in an elevator in a tall building. Your mass is

Oksanka [162]

Answer:

94 kg or 921.6 N

Explanation:

The velocity function is $v(t) = 3t + 0.2t^2$ . The acceleration function, a(t), is the time derivative of the velocity function.

$a(t) = \dfrac{d}{dt}v(t) = 3 + 0.4t$

At $t=4$ ,

$a(4) = 3 + 0.4\times4 = 3+1.6 =4.6\text{ m/s}{}^2$

Because the elevator is going upwards, the net acceleration, $a_N = g + a(4)$ where g us acceleration of gravity.

$a_N = 9.8 + 4.6 = 14.4\text{ m/s}{}^2$

The resultant weight is

$W =m a_N =64\times14.4=921.6 \text{ N}$

Since the bathroom scale is graduated in kg, it's reading is

$m =\dfrac{W}{g}=\dfrac{921.6}{9.8}=94\text{ kg}$

3 0

3 years ago

A motorcycle cover a distance of 1.8 km in 5 minute. calculate its average velocity?

OlgaM077 [116]

Answer:

$solution \\ distance \: travelled = 1.8 \: km \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 1.8 \times 1000m \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 1800 \: m \\ time \: taken = 5 \: minute \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 5 \times 60 \: seconds \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 300 \: seconds \\ average \: velocity = \frac{distance \: travelled}{time \: taken} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = \frac{1800}{ 300} \\ \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: = 6 \: {ms}^{ - 1}$

hope this helps..

8 0

3 years ago

Read 2 more answers

A marble is flicked off the edge of a table. The motion of the marble follows a parabolic path.

dem82 [27]

When marble is flicked off the edge of a table then the at the instant it will move off the table the velocity is horizontal while due to force of gravitation the marble will start accelerating downwards.

So here we will say that the velocity of marble will remain constant through out the motion in X direction as there is no force in that direction

While in Y direction the marble will have gravitational force due to which marble will accelerate downwards

So the path of the marble will be parabolic path

hence the correct answer will be

A.

Only one continuous force is acting on the marble.

5 0

4 years ago

What is the magnitude (in N/C) and direction of an electric field that exerts a 4.00 x 10^−5 N upward force on a −2.00 µC charge

emmasim [6.3K]

Answer:

The magnitude of electric field is $1.25\times10^{14}\ N/C$ in downward.

Explanation:

Given that,

Force $F= 4.00\times10^{-5}\ N$

Charge q= -2.00 μC

We know that,

Charge is negative, then the electric field in the opposite direction of the exerted force.

We need to calculate the magnitude of electric field

Using formula of electric force

$F = qE$

$E = \dfrac{F}{q}$

$E=\dfrac{4.00\times10^{-5}}{-2.00\times1.6\times10^{-19}}$

$E=-1.25\times10^{14}\ N/C$

Negative sign shows the opposite direction of electric force.

Hence, The magnitude of electric field is $1.25\times10^{14}\ N/C$ in downward.

8 0

4 years ago

A beam of light traveling in air strikes a glass slab at an angle of incidence less than 90°. After entering the glass slab, wha

ad-work [718]

Answer:

True A and B

Explanation:

Let's propose the solution of the exercise before seeing the affirmations.

We use the law of refraction

n₁ sin θ₁ = n₂. Sin θ₂

Where n₁ and n₂ are the refractive indices of the two means, θ₁ and θ₂ are the angles of incidence and refraction, respectively

sin θ₂ = (n1 / n2) sin θ₁

Let's apply this equation to the case presented. The index of refraction and airs is 1 (n1 = 1)

Sin θ₂ = (1 / n2) sin θ₁

the angle θ₂ which is the refracted angle is less than the incident angle

Let's analyze the statements time

A. False. We saw that it deviates

B. True Approaches normal (vertical axis)

C. False It deviates, but it is not parallel to normal

D. False It deviates, but approaching the normal not moving away

E. True. Because its refractive index is higher than air,

8 0

3 years ago