3 years ago

Can someone please help me with science.

Physics

1 answer:

vichka [17]3 years ago

5 0

1 is b because a runs 20 and b rus 102 is c

You might be interested in

A ship leaves a port at noon and travels due west at 20 knots. At 6 PM, a second ship leaves the same port and travels northwest

Amanda [17]

Answer:

$v = 12.44 Knots$

Explanation:

First ship starts at Noon with speed 20 Knots towards West

now we know that 2nd ship starts at 6 PM with speed 15 Knots towards North West

so after time "t" of 2nd ship motion the two ships positions are given as

$r_1 = 20(t + 6)\hat i$

$r_2 = 15(t)(cos45\hat i + sin45\hat j)$

now we can find the distance between two ships as

$x = \sqrt{(20(t + 6) - 10.6 t)^2 + (10.6t)^2}$

now we have

$x^2 = (120 + 9.4 t)^2 + (10.6 t)^2$

$x^2 = 200.72 t^2 + 14400 + 2256 t$

now we will differentiate it with respect to time

$2x\frac{dx}{dt} = 401.44 t + 2256$

here we know that

$t = \frac{90}{15} = 6 hours$

so we have

$x = 187.5$

now we have

$2(187.5) v = 401.44(6) + 2256$

$v = 12.44 Knots$

5 0

3 years ago

A 1120 kg car traveling initially with a speed of 27.40 m/s in an easterly direction crashes into the back of a 9 490 kg truck m

asambeis [7]

Answer:

41.5 m/s

Explanation:

Since there are no external forces, momentum must be conserved.

Momentum P = mv.

Total momentum before the collision:

$P = m_{car}v_{car} + m_{tru}_{ck}v_{tru}_{ck} = 1120 * 27.4 + 490 * 20 = 40.488$

Total momentum after the collision:

$P = 1120 * 18 + 490 * v_{tru}_{ck} = 40.488$

solving for v:

$v_{truck} = 41.5$

8 0

3 years ago

Compared to wave A, wave B has a _____. (1 point) longer wavelength and lower frequency longer wavelength and lower frequency lo

pshichka [43]

Answer:

longer wavelength and lower frequency

shorter wavelength and greater frequency

Explanation:

f = v/l

l = wavelength

v = speed of wave

f = frequency

7 0

3 years ago

Which picture correctly shows the path of refracted light rays given an object outside the focal point? Select one: a. A b. B c.

Lina20 [59]

Answer:

Answer is C because light travels in a sight line but when light pass through a refractor the light from the source changes direction when passes through a refractor

3 0

2 years ago

How many electron does an aluminum have

Dennis_Churaev [7]

Answer:

Explanation:

8 0

3 years ago

Read 2 more answers