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3 years ago

A car travels 60 miles in the first 2 hours and 68 miles in the next 2 hours

Physics

1 answer:

Gemiola [76]3 years ago

6 0

32miles/hr

Explanation:

Given parameters:

Distance 1 = 60miles

Time 1 = 2hrs

Distance 2 = 68miles

Time 2 = 2hrs

Unknown:

Average speed of the car = ?

Solution:

Average speed is the total distance covered in a particular duration of time.

Average speed = $\frac{total distance}{total time taken}$

Total time taken = time 1 + time 2 = 2hrs + 2hrs = 4hrs

Total distance = distance 1 + distance 2 = 60miles + 68miles = 128miles

Average speed = $\frac{128miles}{4hrs}$ = 32miles/hr

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A physics student standing on the edge of a cliff throws a stone vertically downward with an initial speed of 10 m/s. The instan

gizmo_the_mogwai [7]

Answer:

The velocity just before hitting the ground is $v_f = 30 m/s$

Explanation:

From the question we are told that

The initial speed is $u = 10 m/s$

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From the equations of motion we have that

$v^2 =u^2 + 2as$

Where s is the distance travelled which is the height of the cliff

So making it the subject of the the formula we have that

$s = \frac{v^2 - u^2 }{2a}$

Where a is the acceleration due to gravity with a value $a = 9.8m/s^2$

$s = \frac{30^2 - 10^2 }{2 * 9.8 }$

$s = 40.8 \ m$

Now we are told that was through horizontally with a speed of

$v_x =10 m/s$

Which implies that this would be its velocity horizontally through out the motion

Now it final velocity vertically can be mathematically evaluated as

$v_y = \sqrt{2as}$

Substituting values

$v_y = \sqrt{(2 * 9.8 * 40.8)}$

$v_y = 28.3 \ m/s$

The resultant final velocity is mathematically evaluated as

$v_f = \sqrt{v_x^2 + v_y^2}$

Substituting values

$v_f = \sqrt{10^2 + 28.3^2}$

$v_f = 30 m/s$

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3 years ago

Which step of the scientific methood do you perform after you state the problem

marshall27 [118]

After stating the problem, we form a hypothesis, or an explanation that can be tested.

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3 years ago

When is the angular momentum of a system constant?

Artist 52 [7]

I think it’s a but I’m not 100% sure

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3 years ago

Technician A says that valve overlap is the number of crankshaft degrees that both valves are closed. Technician B says that val

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Answer: Technician B

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It is expressed mathematically in degrees of shaft rotation.

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4 years ago

What will be the ME of a machine that produces a 240 N work with a 300

Elden [556K]

Answer:

Efficiency = 80%

Explanation:

Given the following data;

Work output = 240 N

Work Input = 300 N

To find the mechanical efficiency of a machine;

$Efficiency = \frac {Out-put \; work}{In-put \; work} * 100$

Substituting into the equation, we have;

$Efficiency = \frac {240}{300} * 100$

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Efficiency = 80%

Therefore, the mechanical efficiency of the machine is 80 percent.

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3 years ago