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3 years ago

The blocks shown in the pictures below are all made of wood. Which car will move the fastest?

Physics

1 answer:

Ne4ueva [31]3 years ago

7 0

Answer:

The one with the less mass

Explanation:

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Two identical rifles are shot at the same time, and the sound intensity level is 64.7 dB. What would be the sound intensity leve

mixas84 [53]

Answer:

The sound intensity is still the same. The sound intensity level does not depend on the number of sound sources but only the wave properties of the wave medium and the properties of the sound source. The wave properties of the medium includes the density and also the temperature.

Explanation:

5 0

3 years ago

Read 2 more answers

A string, 30 cm long and having a mass of 45 g, is attached to a 810 Hz oscillator at one end. The other end of the string is fi

Karolina [17]

Answer:

870 N

Explanation:

The expression for velocity of wave in a string is given below

v = $\sqrt{\frac{T}{m} }$ , T is tension and m is mass per unit length .

m = 45 x 10⁻³ / 30 x 10⁻²

= .15 kg/m

Putting the given values in the equation

76 = $\sqrt{\frac{T}{.15} }$

T = 76² x .15

= 866.4

870 N approx.

3 0

3 years ago

A mass of 100 g stretches a spring 5 cm. If the mass is set in motion from its equilibrium position with a downward velocity of

garri49 [273]

Answer:

$w_{0}=14$

$t=\frac{\pi }{14}$

Explanation:

Data

mass m= 100g

Length L= 5cm

we can use:

gm-kL= 0

divide both side by m

g - $\frac{kL}{m}$ =0

where

$\frac{k}{m}$ = $\frac{g}{L}$

$\frac{k}{m}=w_{0}$ ^{2}

so now

$w_{0}^{2}$ = $\frac{9.8*100}{5}$

$w_{0}^{2}=\frac{980}{5}$

$w_{0}^{2}=196$

square both side

$w_{0}=\sqrt{196}$

$w_{0}=14$

We can apply:

u(t)=Acoswt +Bsinwt

u(t)=Acos14t +Bsin14t

u(0)=0 where A=0

therefore

u(0) = Bsin14t

$u^{'}$ (0) = 10 ⇒ 10=14B ⇒ B= $\frac{14}{10}$ B= $\frac{5}{7}$

so now u(t)= $\frac{5}{7}$ sin14t

so t will be:

t= $\frac{\pi }{14}$

t= $\frac{3.14}{14}$

t=0.22 seconds

8 0

3 years ago

A charged particle moves through uniform electric and magnetic fields. Which is true about the magnetic force and the electric f

Katarina [22]

The electric force depends on the speed; the magnetic force does not depend on the speed.

3 0

3 years ago

What happens to waves energy when it’s absorbed by an median

Ipatiy [6.2K]

Answer:

Absorption, in wave motion, the transfer of the energy of a wave to matter as the wave passes through it. The energy of an acoustic, electromagnetic, or other wave is proportional to the square of its amplitude—i.e., the maximum displacement or movement of a point on the wave; and, as the wave passes through a substance, its amplitude steadily decreases.

Explanation:

3 0

3 years ago