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3 years ago

Help! I can't remember how to calculate this.

Physics

1 answer:

Mars2501 [29]3 years ago

5 0

You need to draw two lines from the head of the arrow: one parallel to the axis (which will be bent) and the other one passing through the center of the converging lens <span>(which will continue straight) </span>and see where they intersect.

If the arrow is at an infinite distance, the image will be point-like in F.
If the arrow is at a distance greater than 2F, the image will be upside down between F and 2F.
If the arrow is at a distance of 2F, the image will be upside down in 2F.
If the arrow is at a distance between F and 2F, the image will be upside down beyond 2F.
If the arrow is at a distance F, all rays proceed parallel to each other and no image is formed.
If the arrow is at a distance smaller than F, the image will be virtual.

Therefore, the correct matches are 1B, 2C, 3D, and 4A.

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If you are driving 100 km/h along a straight road and you look to the side for 1.6 s , how far do you travel during this inatten

denis23 [38]

Answer:

The distance traveled is 44.45 m

Solution:

As per the question:

Average speed, $\bar{v} = 100\ km/h$

Time, t = 1.6 s

Now, convert the average speed into m/s:

1 km = 1000 m

1 h = $60\times 60 = 3600\ s$

To calculate the distance traveled:

Now,

$100\ km/h = \frac{100\times 1000}{3600} = 27.78\ m/s$

We know that:

Speed, $\bar{v} = \frac{distance,\ d}{time,\ t}$

Thus

$d = \bar{v}t$

$d = 27.78\times 1.6 = 44.45\ m$

8 0

3 years ago

The mass of the skateboard is 1.8kg and the mass of the skateboarder is 42kg.

Murljashka [212]

Total momentum must be conserved since there are no external forces in the horizontal direction on the skateboarder or the skateboard.

Momentum before the jump:
$P = m_1v_1 + m_2v_2 = (1.8kg)(0) + (42kg)(0) = 0$

Momentum after the jump:
$P = m_1v_1 + m_2v_2 = (1.8kg)(v_1) + (42kg)(0.3 \frac{m}{s} ) = 0$

Solving for the velocity v:
$v_1 = - \frac{m_2v_2}{m_1} = - \frac{(42kg)(0.3 \frac{m}{s} )}{1.8kg} = -7 \frac{m}{s}$

4 0

4 years ago

A solar cooker, really a concave mirror pointed at the sun, focuses the sun's rays 16.0 cm in front of the mirror. what is the r

VARVARA [1.3K]

The focal point of a concave mirror is halfway along the radius, therefore the radius would be 2•16= 32 cm

5 0

3 years ago

If there are no unbalanced forces acting on an object, according to Newton's First Law:

Sergio039 [100]

I think its b because when there is unbalanced forces it accelerates.

Hope this helps you out

4 0

3 years ago

Suppose Person A runs off the edge of the cliff at 2 m/s and Person B runs off the edge at 1 m/s. Which will hit the ground fart

djverab [1.8K]

Answer:

<h2>Person A will hit a distance father</h2>

Explanation:

Based on the fact that the velocity of person A is more than that of person B, that is from the question, person A has a velocity of 2m/s and person B has a velocity of 1m/s, this clearly shows that person A has the tendency to hit a distance farther from the cliff than person B.

3 0

3 years ago