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dlinn [17]
3 years ago
13

An atom with 4 protons, 5 neutrons, and 4 electrons has an atomic mass of _____ amu. (Enter a whole number.)

Physics
1 answer:
Oksi-84 [34.3K]3 years ago
6 0
Atomic mass = number of protons + number of neutrons = 4+5 = 9 amu
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To impress his friends while riding on a carnival
s344n2d4d5 [400]

Answer:

B. decreases while his angular speed remains  unchanged.

Explanation:

His angular speed will always be the same as the wheel's angular speed, which remains constant as it's in uniform motion. As for linear speed, which is defined as the product of angular speed and distance r to the center of rotation, and his distance to center is decreasing, his linear speed must be decreasing as well.

8 0
3 years ago
A solenoidal coil with 25 turns of wire is wound tightly around another coil with 300 turns. The inner solenoid is 25.0 cm long
joja [24]

Answer:

5.65487\times 10^{-8}\ Wb

1.17\times 10^{-5}\ H

-0.020475 V

Explanation:

\mu_0 = Vacuum permeability = 4\pi \times 10^{-7}\ H/m

N_1 = Number of turns of coil  = 25

N_2 = Number of turns of coil 2 = 300

\frac{di_2}{dt} = Rate of current increased = 1.75\times 10^3\ A/s

d = Diameter = 2 cm

r = Radius = \frac{d}{2}=\frac{2}{2}=1\ cm

A = Area = \pi r^2

Magnetic field in the solenoid is given by

B=\mu_0\frac{N_2}{l}I\\\Rightarrow B=4\pi\times 10^{-7}\frac{300}{0.25}\times 0.12\\\Rightarrow B=0.00018\ T

Magnetic flux is given by

\phi=BA\\\Rightarrow \phi=0.00018\times \pi\times 0.01^2\\\Rightarrow \phi=5.65487\times 10^{-8}\ Wb

The average magnetic flux through each turn of the inner solenoid is 5.65487\times 10^{-8}\ Wb

Mutual inductance is given by

L=\frac{N_1\phi}{i_1}\\\Rightarrow L=\frac{25\times 5.65487\times 10^{-8}}{0.12}\\\Rightarrow L=1.17\times 10^{-5}\ H

The mutual inductance of the two solenoids is 1.17\times 10^{-5}\ H

Induced emf is given by

V=-L\frac{di_2}{dt}\\\Rightarrow V=-1.17\times 10^{-5}\times 1.75\times 10^3\\\Rightarrow V=-0.020475\ V

The emf induced in the outer solenoid by the changing current in the inner solenoid is -0.020475 V

5 0
3 years ago
1. Most of the stars on the HR Diagram are classified as which type of star?
xenn [34]

Answer:

1. Main Sequence - middle life 17

2. red

3. blue

4. White dwarf stars are much hotter than Red Supergiants 15. List the color of the stars from hottest to coldest: Blue, White, Yellow, Orange, Red 16.

5. red giants

Explanation:

Main sequence stars have a Morgan-Keenan luminosity class labeled V. red giant and supergiant stars (luminosity classes I through III) occupy the region above the main sequence. They have low surface temperatures and high luminosities which, according to the Stefan-Boltzmann law, means they also have large radii. White dwarf stars are much hotter than Red Supergiants 15. List the color of the stars from hottest to coldest: Blue, White, Yellow, Orange, Red 16. The hottest stars are the blue stars. A star appears blue once its surface temperature gets above 10,000 Kelvin, or so, a star will appear blue to our eyes. The lowest temperature stars are red while the hottest stars are blue. Astronomers are able to measure the temperatures of the surfaces of stars by comparing their spectra to the spectrum of a black body. Most stars, including the sun, are "main sequence stars," fueled by nuclear fusion converting hydrogen into helium. ...

As stars begin to die, they become giants and supergiants (above the main sequence).

5 0
3 years ago
Read 2 more answers
A large pendulum with a 200-lb gold-plated bob 12 inches in diameter is on display in the lobby of the United Nations building.
Tpy6a [65]

Answer:

2.4s

Explanation:

The length of the pendulum = 75ft

Diameter d = 12 inches

The time period of the pendulum is given as

T = 2pi(L/g)^1/2

Then the time it takes to move from displacement to equilibrium is given as:

t = T/4

= (Pi/2)*(L/g)^1/2

= pi/2 x [(75x0.3048)/9.81]^0.5

= 1.57x[22.86/9.81)^0.5

= 2.4s

2.4 seconds is the least amount of time that it would take.

5 0
3 years ago
What are some types of landforms on Earth’s surface?<br><br><br><br> PLS ANSWER QUICK 11 POINTS
Brrunno [24]

Answer:

plateau, mountains, hills, plains

5 0
3 years ago
Read 2 more answers
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