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3 years ago

Which sentence contains an error in word usage

SAT

1 answer:

slava [35]3 years ago

3 0

Answer: The answer is B, "Jon was surprised when it did not take him long to learn three cords on the guitar"

Explanation: "Cords" is a type of rope and therefore incorrect in the context of the sentence. Instead, it should be "chords" because Jon is learning to play a musical instrument, and chords refers to a group of harmonized notes used in music.

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The table shows the scores that Ms. Cohen’s students earned on the Chapter 6 and Chapter 7 tests. Student Scores A 3-column tabl

exis [7]

Answer:

Explanation:

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2 years ago

A point charge q1 = -4. 00 nc is at the point x = 0. 60 m, y = 0. 80 m , and a second point charge q2 = +6. 00 nc is at the poin

Alekssandra [29.7K]

The net electric field is the vector sum of the components of the electric

field produced by the two charges.

The values of the magnitude and direction of the net electric field at the origin (approximate values) are;

131.6 N/C

12.6 ° above the negative x–axis

<h3>How are the net electric field magnitude and direction calculated?</h3>

The possible questions based on a similar question posted online are;

(a) The net electric field at the origin.

The electric field due to charge q₁ is given as follows;

$\vec E_{1x} = \mathbf{ \dfrac{1}{4 \cdot \pi \cdot \epsilon_0} \cdot \dfrac{q_1}{\vec{r}^2_2}}$

Which gives;

$\vec{E}_{1x} =\mathbf{ \dfrac{\left(9 \times 10^9 \, N \cdot m/C^2 \right) \cdot \left(-4 \, nC \times \dfrac{10^{-9}C}{1 \, nC} \right)}{\left(1 \, m \right)^2}} \cdot cos\left(arctan\left(\dfrac{0.8}{0.6} \right) \right) =-21.6 \, N/C$

$\vec{E}_{1y} = \mathbf{\dfrac{\left(9 \times 10^9 \, N \cdot m/C^2 \right) \cdot \left(-4 \, nC \times \dfrac{10^{-9}C}{1 \, nC} \right)}{\left(1 \, m \right)^2}} \cdot sin\left(arctan\left(\dfrac{0.8}{0.6} \right) \right) = 28.8 \, N/C$

Which gives;

$\vec{E}_1 = \mathbf{21.6 \, N/C \cdot \hat x + 28.8 \, N/C \hat y}$

$\vec{E}_{2x} = \dfrac{\left(9 \times 10^9 \, N \cdot m/C^2 \right) \cdot \left(6.00 \, nC \times \dfrac{10^{-9}C}{1 \, nC} \right)}{\left(1 \, m \right)^2} = 150 \, N/C$

Therefore;

$\vec {E} = \left[ 21.6 \, N/C - 150 \, N/C \right] \left( \hat x \right) + \left(28.8 \, N/C \right) \left( \hat y \right)$

$\vec {E} = \mathbf{\left( -128.4 \, N/C \right) \left( \hat x \right) + \left(28.8 \, N/C \right) \left( \hat y \right)}$

The magnitude of the net electric field is therefore;

E = $\sqrt{(-128.4^2 + 28.8^2)}$ ≈ 131.6

The magnitude of the net electric field at the origin is E ≈<u> 131.6 N/C</u>

(b) The direction of the net electric field at the origin.

$The \ direction \ is \ arctan \left(\dfrac{28.8}{-128.4} \right) \approx \underline{ 12.6^{\circ}} \ above \ the \ negative \ x-axis$

Learn more about electric field strength here:

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2 years ago

A scientist is tracking an object orbiting the Sun that is found between Mars and Jupiter. In order to classify the object as an

zaharov [31]

The answer is: 1 km

If the size is small than 1km in diameter, the object would be classified as a a meteoroid, not an asteroid. Up until the year of 2018, NASA has spotted around 147,132 asteroids. From that number, around 8% of them had the risk of colliding with the earths.

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3 years ago

Given that sin 53° = 0.8, what is the approximate length of side AB in the figure above?

Lisa [10]

Correct Answer= 6 lols

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2 years ago

Asides from a student I'd what is another card a college student can use to obtain discounts

VashaNatasha [74]

Aside from the student id, the student advantage discount card can be use by students to have discounts and can save money during college. The Student Advantage discount card offers discounts for retail,travel and entertainment with a membership fee annually.

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3 years ago

Which sentence contains an error in word usage​

Which sentence contains an error in word usage