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4 years ago

3. You drop an egg out of your 10 m 2nd story window. If it took 1.43 sec, calculate the

Physics

1 answer:

zhannawk [14.2K]4 years ago

8 0

Answer:

15 is the answer

Explanation:

i multiplied 1.5 by 10 to get 15

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(a) Find the position vector of a particle that has the given acceleration and the specified initial velocity and position. a(t)

dolphi86 [110]

Answer:

$r(t)=(\frac{10t^3}{3}+t)i+(-sint+t+1)j+(\frac{-cos2t}{4}+\frac{1}{4})k$

Explanation:

a(t)=20t i+sin(t) j +cos(2t) k

v(t)= $\int\limits^a_b {a(t)} \, dt$

= $(10t^2+c_1)i+(-cost+c_2)j+\frac{sin2t}{2}k$ ---------------eqn 1

given v(0)=i

i= $c_1i+(-1+c_2)j+(0+c_3)k$

$c_1=1$ $c_2=1$ $c_3=0$

from equation 1

V(t)= $(10t^2+c_1)i+(-cost+c_2)j+\frac{sin2t}{2}k$ ----------eqn 2

now r(t)= $\int\limits^a_b {v (t)} \, dt$

$(\frac{10t^3}{3}+t+c_1)i+(-sint+t+c_2)j+(\frac{-cos2t}{4}+c_3)k$

given r(0)=j

0i+1j+ok = $c_1i+c_2j+(\frac{-1}{4}+c_3)k$

$c_1=0$ $c_2=0$ $c_3 = \frac{1}{4}$

$r(t)=(\frac{10t^3}{3}+t)i+(-sint+t+1)j+(\frac{-cos2t}{4}+\frac{1}{4})k$

8 0

3 years ago

suppose a scientist found a new matal-like substance in the desert. He determined its mass to be 20 grams. The volume was determ

lys-0071 [83]

Density = (mass) / (volume)

Density = (20 g) / (5 cm³)

Density = 4 g/cm³ .

The density of the substance is greater than the density of water. A lump of the substance will sink in water, unless the lump is formed into a shape that displaces 20 cm³ of water or more, such as a tiny boat shape.

6 0

3 years ago

Will pushing on a car always change the car's mechanical energy?

tamaranim1 [39]

I assume you mean that the car's motor is not running ... the car is just
sitting there.

If that's so, then the car's mechanical energy is just like the mechanical
energy of any other object. It has potential energy if it's in a high place
from which it can roll or fall, and it has kinetic energy if it's moving.

-- If you make the car move by pushing it, then you gave it kinetic energy
that it didn't have while it was just sitting there.

-- If it's already moving slowly, and you're able to make it move faster by
pushing, then you increased its kinetic energy.

-- If you're able to push it up a hill, no matter how small the hill is but just
to any higher place, then you gave it more gravitational potential energy
than it had before you came along.

In all of these cases, if you exert a force and keep exerting it through some
distance while the car moves, then you have done "work", which is just
another name for mechanical energy, and your work adds to the mechanical
energy of the car.

But if you didn't move the car, then no matter how hard you pushed, no work
was done, and the car's mechanical energy didn't change.

7 0

3 years ago

Solar energy isn't usually used as the only power source for a reason because what

Schach [20]

There are many other renewable sources to use such as hydro power, and wind power. All of these are renewable and safe to the environment. One reason solar power may not be used is because of it's cost.

3 0

3 years ago

One isotope of a metallic element has the mass number 65 and 35 neutrons in the nucleus. the cation derived from the isotope has

Lina20 [59]

The mass number of an isotope is the sum of the numbers of protons and the numbers of the neutron. Given that the mass number is 65 and the number of neutrons is 35, the number of protons is 30. The atom is then Zinc (Zn). The charge is equal to +2, as it lacks 2 more electrons.

7 0

4 years ago