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3 years ago

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A 42-kg crate rests on a horizontal floor, and a 52-kg person is standing on the crate. (a) determine the magnitude of the norma

l force that the floor exerts on the crate. (b) Determine the magnitude of the normal force that the crate exerts on the person.

1 answer:

Lemur [1.5K]3 years ago

6 0

Hope this helps you.

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A microphone is attached to a spring that is suspended from the ceiling, as the drawing indicates. Directly below on the floor i

Nutka1998 [239]

Answer:

$0.361\ \text{m}$

Explanation:

$f_s$ = Frequency of source = 375 Hz

$\Delta f$ = Difference between the maximum and minimum sound frequencies = 2.75 Hz

v = Speed of sound in air = 343 m/s

T = Time period = 1.8 s

$v_m$ = Maximum speed of the microphone

We have the relation

$\Delta f=2f_s\dfrac{v_m}{v}\\\Rightarrow v_m=\dfrac{\Delta fv}{2f_s}\\\Rightarrow v_m=\dfrac{2.75\times 343}{2\times 375}\\\Rightarrow v_m=1.26\ \text{m/s}$

Amplitude is given by

$A=\dfrac{v_mT}{2\pi}\\\Rightarrow A=\dfrac{1.26\times 1.8}{2\pi}\\\Rightarrow A=0.361\ \text{m}$

The amplitude of the simple harmonic motion is $0.361\ \text{m}$ .

5 0

3 years ago

What do you know about air?

aleksandr82 [10.1K]

Answer:

Explanation:

It is everywhere and essential for all life on earth.

7 0

3 years ago

How much energy is needed to generate 0.71 x 10-16 kg of mass?

AleksAgata [21]

Answer:

6.39 J of energy is needed to generate 0.71 * 10⁻¹⁶ kg mass

Explanation:

According to the Equation: E = mc²

where the mass, m = 0.71 * 10⁻¹⁶ kg

the speed of light, c = 3 * 10⁸ m/s

The amount of energy needed to generate a mass of 0.71 * 10⁻¹⁶ kg is calculated as follows:

E = (0.71 * 10⁻¹⁶) (3 * 10⁸)²

E = 0.71 * 10⁻¹⁶ * 9 * 10¹⁶

E = 0.71 * 9

E = 6.39 J

6 0

3 years ago

How are frequency and period related?

nikdorinn [45]

They are inversely related. Frequency is cycles per second and period is seconds per cycle

7 0

3 years ago

A coil has a dc resistance of 60 Ï and an impedance of 200 Ï at a frequency of 1.5 khz. neglect the wiring capacitance of the co

xenn [34]

Answer:

The inductance of the coil is 20 mH

Explanation:

The coil is represented by inductance and resistance connected in series. The impedance of such a circuit is as follows:

$Z^2=R^2+X_L^2$

We can use this relationship to determine the inductance:

$X_L=2\pi fL=\sqrt{Z^2-R^2}\implies L=\frac{\sqrt{Z^2-R^2}}{2\pi f}\\L=\frac{\sqrt{200^2-60^2}\Omega}{2\pi 1500 \frac{1}{s}}=0.020\Omega\cdot s=20 mH$

3 0

3 years ago