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3 years ago

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A boat leaves a dock at 7:00 pm and travels due south at a speed of 20 km/h. another boat has been heading due east at 15 km/h a

nd reaches the same dock at 8:00 pm. how many minutes after 7:00 pm were the two boats closest together? (round your answer to the nearest minute.)

1 answer:

xxMikexx [17]3 years ago

7 0

Zero minute
Because the traveling boat is faster .
And this is my answer

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**URGENT** Now lets look at a skydiver who jumps out of a plane that has a forward velocity of 40 m/s. ignore air resistance. Af

Dennis_Churaev [7]

If there's no air resistance, then the diver keeps moving horizontally at 40 m/s, even after s/he jumps out of a perfectly good airplane.

Also, gravity ADDS 9.8 m/s of downward speed for every second the diver falls.

One second after leaving the airplane, the diver is moving horizontally at 40 m/s, and moving vertically downward at 9.8 m/s .

The question asks for the "downward velocity". That's 9.8 m/s .

The diver's TOTAL velocity is

   √ (40² + 9.8²)

   = √ (1,600 m²/s² + 96.04 m²/s²)

   = √ (1,696.04 m²/s²)

       = 41.2 m/s in some direction between
   straight forward and straight down.

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3 years ago

PLS HELP!!! The quarter back runs 75 meters down a football field in 12 seconds to score a touchdown. How fast did he run? A. 0.

atroni [7]

Answer:

B.6

Explanation:

speed = distance / time

= 75m / 12s

= 6.25 m/s

The closest answer is b. 6 m/s

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4 years ago

A toy gun uses a spring to project a 5.3 - g soft rubber sphere horizontally. The spring constant is 8.0 N/m, the barrel of the

Vikki [24]

Answer:

v = 1.16 m/s

Explanation:

As per work energy theorem we know that work done by all forces on the sphere is equal to the change in kinetic energy of the sphere

So here we will have

$\frac{1}{2}kx^2 - F_f .d = \frac{1}{2}mv^2$

here we know that

$F_f = 0.032 N$

k = 8 N/m

now we have

$\frac{1}{2}(8)(0.05^2) - (0.032)(0.15 + 0.05) = \frac{1}{2}(0.0053)v^2$

$0.01 - 6.4 \times 10^{-3} = 2.65 \times 10^{-3} v^2$

$v = 1.16 m/s$

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4 years ago

What type of cooling would a scientist determine formed an igneous rock found with large crystals? Slow cooling Medium rate cool

Dmitriy789 [7]

Slower cooling engenders the growth of larger crystals in igneous rocks, thus, your answer should be slow cooling!

Hope this helped!

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3 years ago

Read 2 more answers

2. A new racecar track is being created, and the owners want the cars to complete 10

jeka57 [31]

Answer:

0.45 miles

Explanation:

since, car will be running on the edge of track, distance covered in one lap by car will be equal to circumference of track.\

we will use value of pi as 22/7

Circumference for any circular shape is given by $\piD$ $\pi D$

Hence, in one lap $\pi D$ distance will be covered

in 7 laps $7 \pi D$ distance will be covered.

but is given that 7 laps should be equal to 10 miles

so 10 miles will be equal to $7\pi D$

$7\pi D= 10 \ miles\\=> 7*(22/7)* D= 10 \ miles\\=> 22D = 10 \ miles\\=> D = 10/22 \ miles\\=> D = 0.45 \ miles$

Thus, diameter of track will be 0.45 miles to meet the requirement.

3 0

3 years ago