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stepan [7]
4 years ago
13

Fysical suo

Physics
1 answer:
bezimeni [28]4 years ago
7 0

Answer:

0.8 - 1.25

Explanation:

f = n \div t

period = 1 \div f

f = 20/25 = 0.8 Hz

period = 1/0.8 = 1.25 s

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What is true about the force between charges?
shusha [124]

Answer:

The statements A and D are true

The statements B and C are false

Explanation:

The force between charges can be explained by the Coulomb's Law.

According to Coulomb:

1 - Like charges always repel each other

2- Unlike or opposite charges always attrack each other

3- Force between 2 charges is given by:

F=k\frac{q_1q_2}{r^2}

where F is the force between 2 charges and r is the distance between 2 charges.

We can see that Force F is inversely proportional to the distance r

Which means that when F increase, r decreases and when F decreases, r increases

5 0
4 years ago
Read 2 more answers
Gold, which has a density of 19.32 g/cm3, is the most ductile metal and can be pressed into a thin leaf or drawn out into a long
NNADVOKAT [17]

Answer:

a) 578.0 cm²

b) 25.18 km

Explanation:

We're given the density and mass, so first calculate the volume.

D = M / V

V = M / D

V = (6.740 g) / (19.32 g/cm³)

V = 0.3489 cm³

a) The volume of any uniform flat shape (prism) is the area of the base times the thickness.

V = Ah

A = V / h

A = (0.3489 cm³) / (6.036×10⁻⁴ cm)

A = 578.0 cm²

b) The volume of a cylinder is pi times the square of the radius times the length.

V = πr²h

h = V / (πr²)

h = (0.3489 cm³) / (π (2.100×10⁻⁴ cm)²)

h = 2.518×10⁶ cm

h = 25.18 km

3 0
3 years ago
Bats use sound to sense objects by sending out short ultrasound pulses and listening for the echo off the object. A. Sketch the
ivann1987 [24]

Answer:

B. t = 0.250s

Explanation:

A. An image with the sketch of the bat emitting a sound, which reflects on a surface and return to the bat is attached below.

B. In order to calculate the time that the pulse emitted by the bat, return to the bat, you first calculate the time that pulse takes to arrive to the object.

You use the following formula:

x=vt      (1)

x: distance to the object = 43m

t: time = ?

v: speed of sound beat = 343 m/s  

You solve the equation (1) for t:

t=\frac{x}{v}=\frac{43m}{343m/s}=0.125s

The time on which the bat hears the echo is twice the value of t, that is:

t'=2(0.125s)=0.250s

The time on which bat heart the echo of its sound, from the moment on which bat emitted it, is 0.250s

6 0
3 years ago
The frequency of a microwave signal is 9.76 ghz. what is its wavelength? (c = 3.00 × 108 m/s)
dolphi86 [110]
The basic relationship between frequency of an electromagnetic wave and wavelength of the wave is
c = \lambda f
where c=3 \cdot 10^8 m/s is the speed of light.

Manipulating the equation, we can rewrite it as
\lambda =  \frac{c}{f}

The frequency of the wave in our problem is
9.76 GHz = 9.76 \cdot 10^9 Hz
so if we use the previous formula, we find the correspondant wavelength:
\lambda =  \frac{3 \cdot 10^8 m/s}{9.76 \cdot 10^9 Hz} =0.031 m
8 0
3 years ago
How do I do number 8, plz respond quick, I have a big unit test on this and I’m rocking a 65 science average rn. Thank you for t
xxTIMURxx [149]

Answer:

3 is the correct answer for number 8

6 0
4 years ago
Read 2 more answers
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