Physics, 04.07.2019 05:10 moodyshaliyah01

Apendulum is made by letting a 2.0-kg object swing at the end of a string that has a length of 1.5 m. the maximum angle the string makes with the vertical as the pendulum swings is 30°. what is the speed of the object at the lowest point in its trajectory?

Answers: 3

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Answer from: izzynikkie

v = 2 m/s

Explanation:

Here we can use energy conservation to find the speed at the lowest point on its trajectory

As we know that by energy conservation

initial total gravitational potential energy = final total kinetic energy

now the height that is moved by the pendulum while it swing down is given as

h = L(1 - cos30)

h = 1.5(1 - cos30) = 0.200 m

now we can use energy conservation as

$mgh = \frac{1}{2}mv^2$

$v = \sqrt{2gh}$

$v = \sqrt{2(9.8)(0.200)}$

v = 2 m/s

Answer from: wilkinsserrano3

v = 1.978 m/s

Explanation:

Given that,

Mass of the object, m = 2 kg

Length of the string, l = 1.5 m

The maximum angle the string makes with the vertical as the pendulum swings is 30°, $\theta=30^{\circ}$

The pendulum have gravitational potential energy when the angle is maximum. The pendulum has only kinetic energy at its lowest point. Let v is the speed of the object at the lowest point in its trajectory. It can be calculated as :

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

h is the height moved by the pendulum.

h=l(1-cos(30))

h=1.5(1-cos(30))

h = 0.2 m

$v=\sqrt{2gh}$

$v=\sqrt{2\times 9.8\times 0.2}$

v = 1.978 m/s

So, the speed of the object at the lowest point in its trajectory is 1.978 m/s.

Answer from: Quest

chemical properties of thing

Answer from: Quest

An atom (ours, not carroll's) consists of a positively charged nucleus, surrounded by one or more negatively charged particles called electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6 nm. * if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -

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Apendulum is made by letting a 2.0-kg object swing at the end of a string that has a length of 1.5 m...