Write down the units for the following physical quantities:

snow_lady [41]

politics. Famous possible eg is of Werner Heisenberg in WW2. He delayed German attempt to build a nuclear bomb. US did build one ... hiroshima and nagasaki.

debbie may have got skilfully lucky by trial and error

6 0

3 years ago

Read 2 more answers

The greater the of an object the more force is needed to cause acceleration

d1i1m1o1n [39]

the greater the <u>mass</u> of an object the more force is needed to cause acceleration

8 0

4 years ago

An empty rubber balloon has a mass of 12.5 g. The balloon is filled with helium at a density of 0.181 kg/m3. At this density the

Taya2010 [7]

Answer:

5.5 N

Explanation:

mass of balloon (m) = 12.5 g = 0.0125 kg

density of helium = 0.181 kg/m^{3}

radius of the baloon (r) = 0.498 m

density of air = 1.29 kg/m^{3}

acceleration due to gravity (g) = 1.29 m/s^{2}

find the tension in the line

the tension in the line is the sum of all forces acting on the line

Tension =buoyant force + force by helium + force of weight of rubber

force = mass x acceleration

from density = \frac{mass}{volume} , mass = density x volume

buoyant force = density x volume x acceleration

where density is the density of air for the buoyant force

buoyant force = 1.29 x (\frac{4]{3} x π x 0.498^{3}) x 9.8 = 6.54 N

force by helium = density x volume x acceleration

force by helium = 0.181 x (\frac{4]{3} x π x 0.498^{3}) x 9.8 = 0.917 N

force of its weight = mass of rubber x acceleration

force of its weight = 0.0125 x 9.8 = 0.1225 N

Tension = buoyant force + force by helium + force of weight of rubber

the force of weight of rubber and of helium act downwards, so they

carry a negative sign.

Tension = 6.54 - 0.917 - 0.1225 = 5.5 N

8 0

3 years ago

What step precedes the onset of hydrogen fusion in a star?

defon

The first step Hydrogen fusion process a nucleus of Deuterium (2H)is formed for two protons with the emission of an antielectron and neutronic.
University of Oregon.

6 0

3 years ago

A spring whose spring constant is 850 N/m is compressed 0.40 m. What is the maximum speed it can give to a 0.5 kg box? Assume th

OverLord2011 [107]

The maximum speed, the box can attain is 16.5 m/s.

<u>Explanation:</u>

According to law of conservation of energy, energy can be transferred from one form to another. So here the spring force is converted to kinetic energy experienced by the box due to the spring.

As we know, that spring force is directly proportional to the square of the displacement and spring constant, the conservation of energy will be give

$\frac{kx^{2} }{2} =\frac{mv^{2} }{2}$

So, we know that spring constant k = 850 N/m, the displacement experienced by the spring due to compression is given as x = 0.4 m. The mass of the box is given as m = 0.5 kg and the velocity we have to find.

$v^{2} = \frac{kx^{2} }{m}$

$v^{2} = \frac{850 \times 0.4 \times 0.4}{0.5} =272 \\ \\v=\sqrt{272} =16.5\ m/s$

Thus, the maximum speed, the box can attain is 16.5 m/s.

5 0

3 years ago