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3 years ago

Which of the following can be computed?

1 answer:

5 0

Answer: only the third option. [Vector A] dot [vector B + vector C]

The dot between the vectors mean that the operation to perform is the "scalar product", alson known as "dot product".

This operation is only defined between two vectors, not one scalar and one vector.

When you perform, in the first option, the dot product of any ot the first and the second vectors you get a scalar, then you cannot make the dot product of this result with the third vector.

For the second option, when you perform the dot product of vectar B with vector C you get a scalar, then you cannot make the dot product ot this result with the vector A.

The third option indicates that you sum the vectors B and C, whose result is a vector and later you make the dot product of this resulting vector with the vector A. Operation valid.

The fourth option indicates the dot product of a scalar with the vector A, which we already explained that is not defined.

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What time that take if wavelength 1/10^8 and 3*10^8 m/s?

asambeis [7]

Answer:3.33x10^(-17)

Explanation:

Period=wavelength ➗ velocity

Period=1/10^8 ➗ (3x10^8)

Period=3.33x10^(-17)

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3 years ago

Which of the following statements about jurisprudence is TRUE?

valentina_108 [34]

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4 0

3 years ago

Please help me if you know physics

Nitella [24]

Answer:

19. down

20. True

Explanation:

The examples I saw were projectiles launched at different angles and speeds. In each case, the only acceleration was ...

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20: due to gravity (true)

4 0

3 years ago

An ideal parallel-plate capacitor consists of two parallel plates of area A separated by a distance d. This capacitor is connect

Elina [12.6K]

Answer:

e) half

Explanation:

as we know relation b/w charge(Q) , capacitance (C) and voltage (V) is

Q = CV ...........(i)

we also know capacitance of a capacitor for separation d and area A is

C = ∈₀A/d ...........(ii)

from the above equation it is clear that C is inversely proportional to separation if separation doubled capacitance will reduced to half and from equation first charge is directly proportional to capacitance.

that s why magnitude of charge will reduced to half

so option (e) is right answer

3 0

3 years ago

An electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. An electron moving in the +x direc

levacccp [35]

Complete question:

An electron is a subatomic particle (m = 9.11 x 10-31 kg) that is subject to electric forces. An electron moving in the +x direction accelerates from an initial velocity of +6.18 x 105 m/s to a final velocity of 2.59 x 106 m/s while traveling a distance of 0.0708 m. The electron's acceleration is due to two electric forces parallel to the x axis: F₁ = 8.87 x 10-17 N, and , which points in the -x direction. Find the magnitudes of (a) the net force acting on the electron and (b) the electric force F₂.

Answer:

(a) The net force of the electron, ∑F = 4.07 x 10⁻¹⁷ N

(b) the electric force, F₂ = 4.8 x 10⁻¹⁷ N

Explanation:

Given;

initial velocity of the electron, $v_0$ = +6.18 x 10⁵ m/s

final velocity of the electron, $v_f$ = 2.59 x 10⁶ m/s

the distance traveled by the electron, d = 0.0708 m

The first electric force, $F_1 = 8.87*10^{-17} \ N$

(a) The net force of the electron is given as;

∑F = F₁ - F₂ = ma

where;

a is the acceleration of the electron

$a = \frac{v_f^2 -v_0^2}{2d} \\\\a = \frac{(2.59*10^6)^2 -(6.18*10^5)^2}{2(0.0708)}\\\\a = 4.468*10^{13} \ m/s^2$

∑F = ma = (9.11 x 10⁻³¹ kg)(4.468 x 10¹³)

∑F = 4.07 x 10⁻¹⁷ N

(b) the electric force, F₂ is given as;

∑F = F₁ - F₂

F₂ = F₁ - ∑F

F₂ = 8.87 x 10⁻¹⁷ - 4.07 x 10⁻¹⁷

F₂ = 4.8 x 10⁻¹⁷ N

5 0

3 years ago