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3 years ago

Determine the kinetic energy of a 1000-kg roller coaster car that is moving with a speed of 20.0 m/s

Physics

1 answer:

erastovalidia [21]3 years ago

8 0

Answer:

$2*10^{5}$

Explanation:

Kinetic energy = $\frac{1}{2}$ M $V^{2}$

M is mass

V is velocity

K.E. = $\frac{1}{2}$ * 1000 * $20^{2}$

K.E. = $2*10^{5}$

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Can someone please help!!

frosja888 [35]

Answer:

Weight needed to balance the bar is $8.5N$

Explanation:

Given the weight of the bar is $8N$

The length of the bar is $5m$

The weight of the bar will be uniformly distributed over the entire span. We will consider this as a point load acting in the middle of span length, which is at a distance of $2.5m$ from both ends.

Now applying momentum equation about balanced load we get, (see attachment)

$\sum m_i=0\\2(m)+8(1)-8(0.5)-7(3)=0\\2m+8-4-21=0\\2m-17=0\\2m=17\\m=\frac{17}{2}=8.5\\So,\ m=8.5N$

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3 years ago

A highway patrolman traveling at the speed limit is passed by a car going 20 mph faster than the speed limit. After one minute,

Oksi-84 [34.3K]

Answer:

It will take 40 seconds to catch the speeding car

Explanation:

Initial speed of the patrolman = 55 mph

after one minute speed of patrol man = 115 mph

now acceleration of patrolman is given by

$a = \frac{v_f - v_i}{t}$

$a = \frac{115 - 55}{1/60} = 3600 m/h^2$

now at this acceleration the distance covered by patrolman in "t" time is given as

$d = v_i t + \frac{1}{2}at^2$

$d = 55t + 1800t^2$

now we know the speed of the speeding car is given as

$v' = (55+20) mph$

now in the same time distance covered by it

$d = 75 t$

now since the distance covered is same

$75 t = 55t + 1800 t^2$

$t = \frac{20}{1800} = \frac{1}{90} h$

$t = 40 seconds$

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4 years ago

Read 2 more answers

As a photon from the Sun's core interacts with an atom or ion, the photon gives up its energy to the particle. But the excited p

Natalka [10]

Answer:

Radiative transport

Explanation:

Radiative transportation takes place extensively in the core of the sun. It produces solar energy which are emitted outward from the core of the sun, and it comprises more than 70% of the sun's heat energy. At the core of the sun, the process of nuclear fusion takes where the hydrogen atoms combines with one another, and forms helium, and during this process, it releases a large amount of energy. The photons continuously interacts with the ions (or atoms) and releases this energy to the particles and the excited particles converts the excess amount of energy into another photon which are carried outward by the process of radiative transport.

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4 years ago

You are planning a trip to the beach 250 miles away. How long will it take if you think you can average 55 miles per hour?

Advocard [28]

Answer: that’s a good question

Explanation:

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4 years ago

Which location is MOST LIKELY to be struck by a hurricane? A) Charleston, South Carolina B) San Diego, California C) Buffalo, Ne

xxTIMURxx [149]

It is A) Charleston because it is the closest city to warm Atlantic waters.

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4 years ago