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Nastasia [14]
3 years ago
15

A stone is thrown vertically upward from ground level at t = 0. At t=2.50 s, it passes the top of a tall building, and 1.50 s la

ter, it reaches its maximum height. What is the height of the tall building? We assume an answer in meters.
Physics
1 answer:
Aliun [14]3 years ago
6 0

Answer:67.45 m

Explanation:

Given

at t=2.5 s it passes the top of a tall building and after 1.5 s it reaches maximum  height

let u is the initial velocity of stone

v=u+at

0=u-gt

u=9.81\times 4=39.24 m/s

Let us take h be the height of building

h=ut+\frac{-1}{2}gt^2

h=39.24\times 2.5-\frac{1}{2}\times 9.81\times 2.5^2

h=67.45 m

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kolezko [41]

Answer:

2.857 gm

Explanation:

<u>Step 1: Energy from uranium fission </u>

The ratio of energy reeled from uranium to coal= 2.5 million times=2.5*10⁶

<u>step2: mass of uranium 235 required </u>

To get the same energy that of 1 ton coal, the mass reuied will be = (1/2.5) * 10⁻⁶ ton=0.4 * 10⁻³ Kg

where we have taken 1 ton = about 1000Kg

<u>step3: mass of uranium </u>

mass of u-235 = 70% of natural Uranium=0.7 Mu

So Mu= (1/0.7 )* mass of U-235=(0.4 * 10⁻³ Kg)/0.7=0.571 gm

<u>Step 4: Mass of ore </u>

mass of Mu = 20% of ore=0.2 M

So, mass of ore= (1/0.2 )* mass of MU-=(0.571)/0.2 gm=2.857 gm

6 0
4 years ago
A uniformly charged conducting sphere of 1.3 m diameter has a surface charge density of 8.1 µc/m2. (a) find the net charge on th
8_murik_8 [283]
<span>The surface charge density = q/A So q = surface charge density x Area The surface area of a sphere of radius R is 4*Pi*R^2. R = d/2 where d is diameter. This leaves us with 1.3/2 = 0.65. Area = 4 * pie * (0.65)^2 = 5.30998. So the net charge q = 8.1 * 10^(-6) * 5.30998 = 42.47998 * 10^(-6) The Total electric flux = Q/e_0 where , 8.854 Ă— 10â’12, e_0 is permitivity of free space. So Flux = 42.47998 * 10^(-6) / 8.854 * 10(â’12) = 4.833 * 10^(-6 - (-12)) = 4.833 * 10^(6)</span>
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Why can people go to the moon but they cant go to the bottom of the ocean??
maw [93]

Answer:u can go to the moon and bottom of the ocean

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Because the suits help them do both of that

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3 years ago
a magnet has a 20 cm magnetic field if a piece of metal is 18 cm from the magnet will it be attracted or not
mina [271]

Answer:

yes

Explanation:

The metal is closer than 20 cm to the magnet which is in the magnetic field.

4 0
4 years ago
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kvv77 [185]

Answer:

B) electrons

Explanation:

When charge is transferred by friction, induction or conduction, the charge carriers are the electrons.

In fact, protons and neutrons are found within the nucleus of the atoms, so they are tightly bound and they cannot be easily gained/given off. On the contrary, electrons are found in the electron clouds around the nucleus, so atoms can more easily gain/lose electrons, which become free and can be passed by an object to another.

The three methods of charging are:

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- Induction: by moving a charged object closer to a neutral object, opposite charges in the neutral object migrate towards the opposite ends of the object, and if the object is connected to the ground, the charges of one polarity leave the object, leaving the object charged

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5 0
3 years ago
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