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andrey2020 [161]

1 year ago

12

3. What is the distance between New York and London, if an airplane flying at 580 Km per hour takes 7 hours to complete the trip

?

1 answer:

Naddik [55]1 year ago

4 0

Answer:

4060 km

Explanation:

580 km/hr * 7 hr = 4060 km

rate * time = distance

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During its swing, a pendulum on a clock has the kinetic energy of 6J and the potential energy of 5J. What formula will you use t

svlad2 [7]

Answer:

Potential energy is converted to kinetic energy, which is the energy exerted by a moving object. An active pendulum has the most kinetic energy at the lowest point of its swing when the weight is moving fastest.

Explanation:

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2 years ago

As the temperature of an object rises, so does the

nikklg [1K]

C. The object is not in motion, ruling out A. We are not adding mass in any way, nor does adding heat to object increase its mass, therefore also ruling out B. Finally, we are not changing the object's position in such a way that gives it a higher ability to do work, ruling out D.

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2 years ago

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A small lead ball, attached to a 1.70-m rope, is being whirled in a circle that lies in the vertical plane. The ball is whirled

Otrada [13]

Answer:

H = 54.37

Explanation:

given,

lead ball attached at = 1.70 m

rate of revolution = 3 revolution/sec

height above the ground = 2 m

$velocity = \dfrac{distance}{time}$

circumference of the circle = 2 π r

= 2 x π x 1.7

= 10.68 m

$velocity = \dfrac{3 \times 10.68}{1}$

v = 32.04 m/s

using conservation of energy

$\dfrac{1}{2}mv^2 + mgh = mgH$

$\dfrac{1}{2}v^2 + gh = gH$

$\dfrac{1}{2}32.04^2 + 9.8\times 2 = 9.8\times H$

$532.88 = 9.8\times H$

H = 54.37

the maximum height reached by the ball is equal to H = 54.37

4 0

2 years ago

A trooper is moving due south along the freeway at a speed of 30.1 m/s when a red car passes the trooper. The red car moves with

romanna [79]

Answer:

The correct answer to the following question will be "41.87 m".

Explanation:

The given values are:

The speed of trooper = $30.1 \ m/s$

The velocity of red car = $45.4 \ m/s$

Now,

A red car goes as far as possible until the speed or velocity of the troops is the same as that of of the red car at

$t=\frac{45-30}{2.7}$ (∵ $time=\frac{distance}{time}$ )

$t=5.56 \ sec$

then,

The distance covered by trooper,

$t1=30\times 5.56+\frac{1}{2}\times 2.7\times (5.56)^2$

$=208.33 \ m$

The distance covered by red car,

= $45\times 5.56$

= $250.2 \ m$

Maximum distance = $250.2-208.33$

= $41.87 \ m$

6 0

2 years ago

Find the time taken if the speed of a train increased rom 72km/h to 90km/h for 234km

Katarina [22]

Answer:

2.89 hours

Explanation:

given :

Vo = 72 km/h

Vt = 90 km/h

S = 234 km

find : the time taken (t) = ?

solution :

2.a.s = Vt² - Vo²

2.a.(234) = 90²- 72²

468.a = 8100 - 5184

= 2916

a = 2916/468 = 6.23 km/h²

so,

t = (Vt-Vo) /a

= (90-72)/ 6.23

= 18/ 6.23

= 2.89 hours

7 0

2 years ago

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