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3 years ago

HELP IM IN A EXAM!!!

Physics

2 answers:

natali 33 [55]3 years ago

8 0

Answer:

Species A and C

Explanation: none

Vesna [10]3 years ago

7 0

Answer:

answer is b and c

Explanation:

i got it right

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What is the frequency of a sound wave with a wavelength of 0.04 meter in air? What type of wave is

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8500 Hz and Longitudinal

Speed = frequency x wavelength

Speed of sound at 20 degrees Celsius is approximately 340 m/s

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2 years ago

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Two large thin metal plates are parallel and close to each other. On their inner faces, the plates have excess surface charge of

wariber [46]

Answer:

For left = 0 N/C

For right = 0 N/C

At middle = $-7.6836 * 10^{-11} \vec{i}$ N/C

Explanation:

Given data :-

б = $6.8 * 10^{-22}$ C/ m²

Considering the two thin metal plates to be non conducting sheets of charges.

Electric field is given by

$E = \frac{\sigma }{2\varepsilon }$

1) To the left of the plate

$\vec{E}= (\frac{\sigma }{2\varepsilon })(-\vec{i})+ (\frac{\sigma }{2\varepsilon })(\vec{i})$ = 0 N/C.

2) To the right of them.

$\vec{E}= (\frac{\sigma }{2\varepsilon })(-\vec{i})+ (\frac{\sigma }{2\varepsilon })(\vec{i})$ = 0 N/C.

3) Between them.

$\vec{E}= (\frac{\sigma }{2\varepsilon })(-\vec{i})+ (\frac{\sigma }{2\varepsilon })(-\vec{i})$ = $(\frac{\sigma }{\varepsilon })(-\vec{i})$ = $-\frac{6.8 * 10^{-22} }{8.85 * 10 ^{-12} } \vec{i}$ = $-7.6836 * 10^{-11} \vec{i}$ N/C

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3 years ago

2. If Chantal needs to travel an additional 150 meters beyond Taylor's house, but she

nirvana33 [79]

Awnser: 600 meters per hour
Step by step explication:
Covert 14 minutes to a fraction of an hour by dividing it by 60, because 60 is how many minutes in an hour and we need to convert it to a decimals. Then divide the distance, 150 meters by the fraction of an hour, .25 to abstain the velocity (speed) of 600 meters per hour.

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2 years ago

According to the plate tectonics model what layers form earths rigid moblie plates

slamgirl [31]

The crust. The crust dude! Have you seen the layers of the earth?

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3 years ago

Neutron stars are extremely dense objects formed from the remnants of supernova explosions. Many rotate very rapidly. Suppose th

mihalych1998 [28]

Answer:

10989.55932 rad/s

Explanation:

m = Mass of object

M = Mass of neutron star = $2\times 1.989\times 10^{30}\ kg$

R = Radius of neutron star = 13000 m

G = Gravitational constant = 6.67 × 10⁻¹¹ m³/kgs²

$\omega$ = Angular speed

Here, the gravitational force will balance the centripetal force

$\dfrac{GmM}{R^2}=mR\omega^2\\\Rightarrow \omega=\sqrt{\dfrac{GM}{R^3}}\\\Rightarrow \omega=\sqrt{\dfrac{6.67\times 10^{-11}\times 2\times 1.989\times 10^{30}}{13000^3}}\\\Rightarrow \omega=10989.55932\ rad/s$

The greatest possible angular speed an object can have is 10989.55932 rad/s

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3 years ago