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4 years ago

A mirror with a reflecting surface that caves inward is said to be

Physics

2 answers:

Sloan [31]4 years ago

3 0

It is said to be concave
and convex is the one reflecting outward

kvasek [131]4 years ago

3 0

It is known as a concave mirror.

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For your senior project, you would like to build a cyclotron that will accelerate protons to 10% of the speed of light. The larg

jeyben [28]

Answer:

<h2>Magnetic field strength in that region is 1.2 T</h2>

Explanation:

As we know by the formula of radius of charge moving in external field is given as

$R = \frac{mv}{qB}$

so we will have

$R = 25 cm$

$m = 1.6 \times 10^{-27} kg$

$q = 1.6 \times 10^{-19} C$

$v = 0.10 \times 3 \times 10^8 m/s$

now we have

$0.25 = \frac{(1.6 \times 10^{-27})(3\times 10^7)}{(1.6 \times 10^{-19})B}$

now we have

$B = 1.2 T$

8 0

3 years ago

Indicate whether the following statements are always true or can be false. An object's velocity will change if a net force acts

Sergio [31]

Answer:

1-An object's velocity will change if a net force acts on the object. (True)

2-In order not to slow down, a car moving at a constant velocity needs a small net force applied. (False)

3- The net force which acts on an object which remains at rest is zero. (True)

4- If an object's speed does not change, no net force is acting on the object.(True)

5- If two objects are under the influence of equal forces, they have the same acceleration. (False)

6- During the collision of a car with a large truck, the truck exerts a greater force on the car than the car exerts on the truck.(False) (Newton Third Law)

3 0

3 years ago

Two charged balls are 10 cm apart. One is positively charged, and the other is negatively charged.

asambeis [7]

Answer:Explanation: The field lines of the electric charges extend from the positive to negative side charge. ... The force between the two charged balls is attractive. It is directly proportional to the product of their charges and inversely proportional to the magnitude of the distance between them.

Explanation:

hope this helps

8 0

3 years ago

When we experience positive "g forces", it is as if we have become...

zhenek [66]

Answer:

heavier

Explanation:

7 0

3 years ago

When on object’s spectral lines are shifted from their rest wavelengths to longer wavelengths, we say that the object’s spectrum

neonofarm [45]

Answer:

Both statements are true.

Explanation:

When a celestial object (stars, galaxies) is moving away from an observer its spectral lines¹ will be shifted to the red part of the spectrum² (longer wavelength), in the other hand if the celestial body is moving toward the observer, the spectral lines will be shifted to the blue part of the spectrum (shorter wavelength). That is known as the Doppler shift.

This Doppler shift can be explained with the Doppler Effect³, which is defined for the case of light as:

$\frac{\Delta \lambda}{\lambda_{0}} = \frac{v}{c}$ (1)

Where $\Delta \lambda$ is the wavelength shift, $\lambda_{0}$ is the rest wavelength, v is the velocity of the source and c is the speed of light.

This redshift in distant galaxies is a strong evidence for the expansion of the universe. Equation 1 also allows the measurement of radial velocity from celestial objects.

Summary:

Blueshift:

$\lambda$

Redshift:

$\lambda >\lambda_{0}$

¹Spectral lines: Determines the presence of particular elements in the photosphere of an star.

²Spectrum: Decomposition of light in its characteristic colors (wavelengths).

³Doppler Effect: Change in the frequency of a wave as a consequence of the movement from a source relative to an observer or vice versa.

4 0

4 years ago