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3 years ago

What is meant by si unit?

Physics

1 answer:

bonufazy [111]3 years ago

4 0

Answer:

The SI base units are the standard units of measurement defined by the International System of Units (SI) for the seven base quantities of what is now known as the International System of Quantities: they are notably a basic set from which all other SI units can be derived.

Explanation:

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13. A hiker walks 200 m west and then walks 100 m north. In what direction is her resulting displacement?

prohojiy [21]

100m north west is the answer

4 0

3 years ago

Read 2 more answers

You are asked to build an LC circuit that oscillates at 13 kHz. In addition, you are told that the maximum current in the circui

inessss [21]

Answer:

a) $L=0.00142H$

b) $C=2.65*10^{-12}$

Explanation:

From the question we are told that:

Frequency $F=13kHz$

Current $I=0.14A$

Capacitor $C_e=1.4*10^{-5}J$

Generally the equation for Energy in the inductor is mathematically given by

Where L is now subject

$L=\frac{2C_e}{I^2}$

$L=\frac{2*1.4*10^{-5}}{(0.14)^2}$

$L=0.00142H$

Generally the equation for Value of Capacitor is mathematically given by

$C=\frac{1}{(2 \pi f)^2} L$

$C=\frac{1}{(2 3.142 13*10^3Hz)^2} *0.00142$

$C=2.65*10^{-12}$

3 0

3 years ago

You catch a volleyball (mass 0.270 kg) that is moving downward at 7.50 m/s. In stopping the ball, your hands and the volleyball

sesenic [268]

Explanation:

The work done equals the change in energy.

W = ΔKE

W = 0 − ½mv²

W = -½ (0.270 kg) (-7.50 m/s)²

W = -7.59 J

Work is force times displacement.

W = Fd

-7.59 J = F (-0.150 m)

F = 50.6 N

3 0

4 years ago

PART ONE

Korvikt [17]

Answer:

1) 460.5 N

2) 431.7 N

Explanation:

Draw a free body diagram. There are four forces on the hammer:

Applied force 62.5 N in the +x direction, 30 cm from the ground

Reaction force Rᵧ in the +y direction, at the point of contact

Reaction force Rₓ in the +x direction, at the point of contact

Reaction force F at 31° from the vertical, 4.75 cm to the left of the point of contact

Part One

To find F, sum the moments about the point of contact:

∑τ = Iα

(62.5 N) (30 cm) − (F cos 31°) (4.75 cm) = 0

F = 460.5 N

Part Two

To find Rₓ and Rᵧ, sum the forces in the x and y directions.

∑Fₓ = ma

62.5 N − F sin 31° + Rₓ = 0

Rₓ = 174.7 N

∑Fᵧ = ma

-F cos 31° + Rᵧ = 0

Rᵧ = 394.7 N

The net reaction force at the point of contact is:

R = √(Rₓ² + Rᵧ²)

R = 431.7 N

7 0

3 years ago

Suppose that the speed of an electron traveling 2.0 km/s is known to an accuracy of 1 part in 105 (i.e., within 0.0010%). What i

OverLord2011 [107]

Answer: $2.89(10)^{-3} m$

Explanation:

The <u>Heisenberg uncertainty principle</u> postulates that the fact each particle has a wave associated with it, imposes restrictions on the ability to determine its position and speed at the same time.

In other words:

It is impossible to measure simultaneously (according to quantum physics), and with absolute precision, the value of the position and the momentum (linear momentum) of a particle. Thus, in general, the greater the precision in the measurement of one of these magnitudes, the greater the uncertainty in the measure of the other complementary variable.

Mathematically this principle is written as:

$\Delta x \geq \frac{h}{4 \pi m \Delta V}$ (1)