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4 years ago

Which meter, ammeter or the voltmeter, has the higher internal resistance? why does this make sense?

Physics

1 answer:

kodGreya [7K]4 years ago

8 0

Answer:

Voltmeter

Explanation:

A voltmeter is usually defined as an instrument that is commonly used to measure the electric potential difference acting between the two ends of a circuit. The unit of voltmeter is volts. Here, connections are made in parallel arrangement.

An ammeter is a device that is commonly used to measure the amount of flowing current within a circuit. The unit of current is in terms of amperes (A). Here, connections are made in series.

A voltmeter is usually comprised of high internal resistance in comparison to an ammeter because a high internal resistance results in the heating up of the battery and subsequent dropping its voltage and after the equipments are being cuts off, it leaves behind certain amount of energy.

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A block of mass m attached to a horizontally mounted spring with spring constant ???? undergoes simple harmonic motion on a fric

Firdavs [7]

Answer:

(E) It would increase by a factor of 2.

Explanation:

Maximum speed (v) is given by:

$v = \omega *A$

Where ω is the angular frequency and A is the amplitude.

The angular frequency of a spring-mass system is given by:

$\omega = \sqrt{\frac{k}{m}}$

Where k is the spring constant and m is the mass of the block attached to the spring.

Therefore, maximum speed can be written as:

$v= A\sqrt{\frac{k}{m}}\\$

Since mass and amplitude are constant values, a relationship between maximum velocity and spring constant can be defined as:

$v =C \sqrt{k}$

There is a linear relationship between maximum velocity and the square root of the spring constant. Therefore if the spring constant is increased by a factor of 4, the velocity is increased by a factor of the square root of 4, which is 2.

The answer is (E) It would increase by a factor of 2.

8 0

3 years ago

A circular copper loop is placed perpendicular to a uniform magnetic field of 0.50 T. Due to external forces, the area of the lo

pogonyaev

Answer:

$6.3\cdot 10^{-4} V$

Explanation:

According to Faraday-Newmann-Lenz, the induced emf in the loop is given by:

$\epsilon=-\frac{\Delta \Phi}{\Delta t}$ (1)

where $\frac{\Delta \Phi}{\Delta t}$ is the rate of variation of the magnetic flux through the loop.

We know that the magnetic flux through the loop is given by

$\Phi = BA$

where B is the magnetic field and A is the area of the loop. Since the magnetic field is constant, we can write the variation of flux as

$\Delta \Phi = B \Delta A$

So eq.(1) becomes

$\epsilon=-B\frac{\Delta A}{\Delta t}$

and the problem gives us:

$B=0.50 T$ is the magnetic field

$\frac{\Delta \Phi}{\Delta t}=-1.26\cdot 10^{-3} m^2/s$ is the rate at which the area changes

Substituting into the equation, we find

$\epsilon=-(0.50 T)(-1.26\cdot 10^{-3} m^2/s)=6.3\cdot 10^{-4} V=0.63 mV$

8 0

3 years ago

10 points

SOVA2 [1]

Explanation:

u=0 m/s

v=9.6 m/s

s= 40.5 m

a=?

V^2=u^2 +2as

9.6^2=0+2×a×40.5

92.16=81a

a=92.16/81

a=1.14m/s^2

3 0

3 years ago

a soccer ball is kicked horizontally off a cliff with an initial speed of 8 m/s and lands 16 m from the base of the cliff What i

Charra [1.4K]

<h3>Answer: 2 seconds</h3>

This problem is equivalent to kicking the ball 8 m/s and it rolls to a point 16 meters away, and everything is on a flat ground (with no cliff). This is because the horizontal component of the velocity does not get affected by how tall the cliff is and the force of gravity. Note how the height of the cliff isn't even mentioned. So that's a clue that we can ignore it.

If x is the number of seconds, then 8x is the distance in meters it travels. So we have 8x = 16 solve to x = 2. The ball travels for 2 seconds before reaching its target.

7 0

3 years ago

Read 2 more answers

What is the main purpose of the stanford linear accelerator center

Katena32 [7]

Answer:

The Stanford Linear Accelerator Center (SLAC) is a nationwide basic laboratory dedicated to empirical and theoretical work in elementary particle physics

Explanation:

Stanford Linear Accelerator Center which termed as SLAC is a nationwide basic laboratory dedicated to empirical and theoretical work in particle physics, the introduction of new strategies in strong-energy propulsion systems and in elementary particle sensors, and a comprehensive research program by initializing synchrotron radiation

6 0

3 years ago