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2 years ago

Why are experiments often performed in laboratories?

Physics

1 answer:

Marrrta [24]2 years ago

6 0

Answer:

Explanation:

Laboratories are usually controlled: however, in public places, there are way too many factors that could change an experiment

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Two astronauts (each with mass 100 kg) are drifting together through space. They are connected to each other by a rope 5 m in le

Nana76 [90]

Answer:

1000 kgm²/s, 400 J

1000 kgm²/s, 1000 J

600 J

Explanation:

m = Mass of astronauts = 100 kg

d = Diameter

r = Radius = $\frac{d}{2}$

v = Velocity of astronauts = 2 m/s

Angular momentum of the system is given by

$L=mvr+mvr\\\Rightarrow L=2mvr\\\Rightarrow L=2\times 100\times 2\times 2.5\\\Rightarrow L=1000\ kgm^2/s$

The angular momentum of the system is 1000 kgm²/s

Rotational energy is given by

$K=I\omega^2\\\Rightarrow K=\frac{1}{2}(mr^2)\left(\frac{v}{r}\right)^2\\\Rightarrow K=mv^2\\\Rightarrow K=100\times 2^2\\\Rightarrow K=400\ J$

The rotational energy of the system is 400 J

There no external toque present so the initial and final angular momentum will be equal to the initial angular momentum 1000 kgm²/s

$L_i=L_f\\\Rightarrow 2mv_ir_i=2mv_fr_f\\\Rightarrow v_f=\frac{v_ir_i}{r_f}\\\Rightarrow v_f=\frac{2\times 2.5}{0.5}\\\Rightarrow v_f=10\ m/s$

Energy

$E_2=mv_f^2\\\Rightarrow E_2=100\times 10\\\Rightarrow E_2=1000\ J$

The new energy will be 1000 J

Work done will be the change in the kinetic energy

$W=E_2-E\\\Rightarrow W=1000-400\\\Rightarrow W=600\ J$

The work done is 600 J

5 0

2 years ago

He does whatever a spider can. Spider-Man, who has a mass of 76 [kg], is clinging onto an inclined wall forming an inclination a

Aliun [14]

Answer:570.54 N

Explanation:

Given

mass of man=76 kg

$\theta =50^{\circ}$

As man is standing over inclined building therefore

its weight has two components i.e. sin and cos component

Force perpendicular to inclined wall

$F=mgcos\theta =76\times 9.8\times \sin 50$

F=570.54 N

4 0

2 years ago

Does current in Helmholtz coils flow in the same or opposite direction through each coil? Explain.

zhenek [66]

To get a uniform field in the central region between the coils, current flows in the same direction in each.

5 0

2 years ago

During which type of collision is none of the energy converted to heat?

Galina-37 [17]

Answer:

Explanation:

7 0

3 years ago

Tsunamis are fast-moving waves often generated by underwater earthquakes. In the deep ocean their amplitude is barely noticable,

vovangra [49]

Answer:

v =163.95 m/s

Explanation:

Given that,

The wavelength of wave, $\lambda=646\ km=646\times 10^3\ m$

Distance covered, $d=3630\ km=3630\times 10^3\ m$

We need to find the speed of the wave. We know that,

speed = distance/time

So,

$v=\dfrac{3630\times 10^3\ m}{22140\ s}\\\\=163.95\ m/s$

So, the speed of the wave is equal to 163.95 m/s.

6 0

2 years ago