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2 years ago

A ball dropped from a window strikes the ground 2.71 seconds later. How high is the window above the ground?

Physics

1 answer:

koban [17]2 years ago

4 0

$s=36.52m$

Given ,

Time =2.71 second

We apply the formula

$s=ut+12at^2$

$u=0,t=2.73 \\a=g \\So, the \\height \\ s=36.52m$

When a body is lying on a horizontal surface, the object is subjected to a downward force due to the action of gravity. These gravitational forces always aim to attract the item, confirming the force's nature as an attractive force. Consider an object of mass "M" resting on a horizontal surface; the force exerted to the object by gravity is equal to the weight of the object "W." The acceleration owing to gravity, indicated as "g," is the acceleration by which an object is drawn towards the ground. As a result, Newton's second law states that when the values in the above connection are substituted.

To learn more about Motion due to gravity from the given link:

brainly.com/question/14047086

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What is a linear motion

nirvana33 [79]

Linear motion (also called rectilinear motion) is a motion along a straight line, and can therefore be described mathematically using only one spatial dimension.

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3 years ago

A coil has an inductance of 5 H and a resistance of 20 Ω. If a DC voltage of 100 V is applied to the coil, find the energy store

nadya68 [22]

Answer:62.5 J

Explanation:

Given

Inductance(L)=5 H

resistance(R) $=20 \Omega$

Voltage(V)=100 V

$Current=\frac{100}{20}=5 A$

Current in L-R circuit is given by

$I=I_0\left [ 1-e^{-\frac{Rt}{L}}\right ]$

and Power=i^2R+Li\frac{di}{dt}[/tex]

For Steady state i.e. at $t=\infty$

$I=I_0$

Energy Stored is $E=\frac{Li^2}{2}$

$E=\frac{5\times 5^2}{2}=62.5 J$

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3 years ago

An atom with 6 protons and 5 electrons would be what kind of atom?

dybincka [34]

cation

anion is negatively charged, so more electrons then protons,

cation is positively charged, so more protons thatn electrons

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4 years ago

Read 2 more answers

what mass of lead has the same volume as 1600 of alcohol ( density of lead =11300kg\m³ and density of alcohol=790kg\m³)

Misha Larkins [42]

The mass of lead = 22,939 kg

<h3>Further explanation</h3>

Given

mass alcohol=1600 kg

The density of lead =11300kg\m³ and density of alcohol=790kg\m³

Required

mass of lead

Solution

volume of alcohol

$\tt V=\dfrac{mass}{\rho}\\\\V=\dfrac{1600}{790}\\\\V=2.03~m^3$

the volume of lead=volume of alcohol=2.03 m, so the mass of lead :

$\tt m=\rho\times V\\\\m=11300\times 2.03\\\\m=22,939~kg$

7 0

3 years ago

Car and a train move together along straight, parallel paths with the same constant cruising speed v0. At t=0 the car driver not

musickatia [10]

Answer:

Part A: $t = v_0/a_0$

Part B: $t = v_0/a_0$

Part C: $v_0^2/a_0$

Explanation:

Part A:

We will use the following kinematics equation:

$v = v_0 + at\\0 = v_0 - a_0t\\t = \frac{v_0}{a_0}$

Part B:

We will use the same kinematics equation:

$v = v_0 + at\\v_0 = 0 + a_0t\\t = \frac{v_0}{a_0}$

Part C:

The total time takes is 2t.

So the train moves a distance of

$x = v_0(2t) = 2v_0(\frac{v_0}{a_0}) = \frac{2v_0^2}{a_0}$

And the car moves a distance in Part A and in Part B:

$d_A = v_0t + \frac{1}{2}at^2 = v_0(\frac{v_0}{a_0}) - \frac{1}{2}a_0(\frac{v_0^2}{a_0^2}) = \frac{v_0^2}{a_0} - \frac{v_0^2}{2a_0} = \frac{v_0^2}{2a_0}\\d_B = v_0t + \frac{1}{2}at^2 = 0 + \frac{1}{2}a_0(\frac{v_0^2}{a_0^2}) = \frac{v_0^2}{2a_0}$

So the total distance that the car traveled is $d = \frac{v_0^2}{a_0}$

The difference between the train and the car is

$x - d = \frac{2v_0^2}{a_0} - \frac{v_0^2}{a_0} = \frac{v_0^2}{a_0}$

8 0

3 years ago