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3 years ago

The potential difference across a variable resistor is 11V and the current flowing through it is 0.4A.

Physics

2 answers:

klemol [59]3 years ago

5 0

The resistance is 27.5 ohms

Paul [167]3 years ago

5 0

Resistance = (potential difference) / (current)

Resistance = (11 V) / (0.4 A)

<em>Resistance = 27.5 ohms</em>

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Most moving objects change speed or direction at some point because _____ forces exist nearly everywhere. A. net B. normal C. ba

dangina [55]

The answer is D. Unbalanced

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3 years ago

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A sports car accelerates uniformly from rest to a speed of 87 mi/hr in 8s. Determine: a.The acceleration of the car

Furkat [3]

Answer:

Part a)

$a = 4.86 m/s^2$

Part b)

$d = 155.52 m$

Part c)

$v_f = 48.6 m/s$

Explanation:

As we know that car start from rest and reach to final speed of 87 mph

so we have

$v_f = 87 mph = 38.88 m/s$

now we have

Part a)

acceleration is rate of change in velocity

$a = \frac{v_f - v_i}{t}$

$a = \frac{38.88 - 0}{8}$

$a = 4.86 m/s^2$

Part b)

distance moved by car with uniform acceleration is given as

$d = \frac{v_f + v_i}{2} t$

$d = \frac{38.88 + 0}{2} 8$

$d = 155.52 m$

Part c)

As we know that the car start from rest

so final speed after t = 10 s

$v_f = v_i + at$

$v_f = 0 + (4.86)10$

$v_f = 48.6 m/s$

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3 years ago

A potato is shot out of cylinder at an angle of 17 degrees above the horizontal with an initial speed of 20 m/s. What is its max

madreJ [45]

Answer:

Maximum height, h = 1.74 meters

Explanation:

It is given that,

A potato is shot out of the cylinder. It is a case of projectile motion. The potato makes an angle of 17 degrees above the horizontal.

Initial speed with which the potato is shot out, u = 20 m/s

We have to find the maximum height of the potato. The maximum height of a projectile (h) is given by the following formula as :

$h=\dfrac{u^2sin^2\theta}{2g}$

Where

$\theta$ = angle between the projectile and the surface

g = acceleration due to gravity

$h=\dfrac{(20\ m/s)^2sin^2(17)}{2\times 9.8\ m/s^2}$

h = 1.74 m

or h = 1.74 meters

Hence, this is the required solution.

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3 years ago

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goldfiish [28.3K]

Answer:

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2 years ago

A bicyclist of mass 112 kg rides in a circle at a speed of 8.9 m/s. If the radius of the circle is 15.5 m, what is the centripet

kogti [31]

The centripetal force, Fc, is calculated through the equation,
Fc = mv²/r
where m is the mass,v is the velocity, and r is the radius.
Substituting the known values,
Fc = (112 kg)(8.9 m/s)² / (15.5 m)
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3 years ago

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