All categories

3 years ago

Why do we feel the effects of gravity given that the gravitational force is so weak?

Physics

2 answers:

ArbitrLikvidat [17]3 years ago

7 0

Answer:

Explanation:

Any thing in the universe attracts each other. As earth is attracting us towards it and we attracts earth toward our self. But earth have a huge mass and gravity largely depends upon mass so gravitation force of earth is more and earth attracts us. because of huge weight of earth we can feel gravitational force of earth.

almond37 [142]3 years ago

6 0

Any two objects in the universe attract each other. Gravity is the force exerted by earth on you (you exert the same force on earth) but due to the fact that earth has a huge mass compared to yours, you will be attracted to earth only by a small gravitational force.

You might be interested in

What are the rows of the periodic table of the elements also called?

Ostrovityanka [42]

Answer:

periods

Explanation:

7 0

3 years ago

Read 2 more answers

A 40.0 turn coil of wire of radius 3.0 cm is placed between the poles of an electromagnet. The field increases from 0 to 0.75 T

nadezda [96]

Answer:

Induced emf, $V=3.76\times 10^{-4}\ V$

Explanation:

We have,

Number of turns in the coil, N = 40

Radius of coil, r = 3 cm = 0.03 m

The field increases from 0 to 0.75 T at a constant rate in a time interval of 225 s.

It is required to find the magnitude of the induced emf in the coil if the field is perpendicular to the plane of the coil. The induced emf is given by :

$\epsilon=\dfrac{d\phi}{dt}$

$\phi=NBA\cos\theta$ , is magnetic flux

$\epsilon=NA\dfrac{dB}{dt}\\\\\epsilon=\dfrac{40\times \pi (0.03)^2\times (0.75-0)}{225}\\\\\epsilon=3.76\times 10^{-4}\ V$

So, the magnitude of induced emf is $3.76\times 10^{-4}\ V$ .

7 0

2 years ago

A 15-N force to the left and a 45-N force to the right act on a 10 kg object in opposite directions.

aleksley [76]

Answer:

daddy

Explanation:

6 0

2 years ago

A 6.0-cm-diameter, 11-cm-long cylinder contains 100 mg of oxygen (O2) at a pressure less than 1 atm. The cap on one end of the c

g100num [7]

Explanation:

The given data is as follows.

Mass of oxygen present = 100 mg = $100 \times 10^{-3}$ g

So, moles of oxygen present are calculated as follows.

n = $\frac{100 \times 10^{-3}}{32}$

= $3.125 \times 10^{-3}$ moles

Diameter of cylinder = 6 cm = $6 \times 10^{-2}$ m

= 0.06 m

Now, we will calculate the cross sectional area (A) as follows.

A = $\pi \times \frac{(0.06)^{2}}{4}$

= $2.82 \times 10^{-3} m^{2}$

Length of tube = 11 cm = 0.11 m

Hence, volume (V) = $2.82 \times 10^{-3} \times 0.11$

= $3.11 \times 10^{-4} m^{3}$

Now, we assume that the inside pressure is P .

And, $P_{atm}$ = 100 kPa = 100000 Pa,

Pressure difference = 100000 - P

Hence, force required to open is as follows.

Force = Pressure difference × A

= $(100000 - P) \times 2.82 \times 10^{-3}$

We are given that force is 173 N.

Thus,

$(100000 - P) \times 2.82 \times 10^{-3}$ = 173

Solving we get,

P = $3.8650 \times 10^{4} Pa$

= 38.65 kPa

According to the ideal gas equation, PV = nRT

So, we will put the values into the above formula as follows.

PV = nRT

$38.65 \times 3.11 \times 10^{-4} = 3.125 \times 10^{-3} \times 8.314 \times T$

T = 462.66 K

Thus, we can conclude that temperature of the gas is 462.66 K.

6 0

3 years ago

Which of the following statements are true?

maksim [4K]

Answer:

A)The resistance of a conductor is proportional to the resistivity of the material of which the conductor is composed.

D)A material that obeys Ohm's law reasonably well is called an ohmic conductor or a linear conductor

E)Good conductors of electricity have larger conductivity values than insulators.

Explanation:

Let's analyze each statement separately:

A)The resistance of a conductor is proportional to the resistivity of the material of which the conductor is composed. --> TRUE.

The resistance of a conductor is given by

$R=\frac{\rho L}{A}$

where

$\rho$ is the resistivity of the material

L is the length of the conductor

A is its cross-sectional area

From the formula, we see that the resistance is proportional to the resistivity.

B)Semiconductors have resistivity values that are larger than those of insulators. --> FALSE.

Insulators are material in which electrons cannot travel freely, so they do not conduct electricity well, and so their resistivity is very high. On the other hand, semiconductor can conduct electricity (electrons are able to move), so their resistivity is lower than insulators.

C)The resistance of a conductor is proportional to the conductivity of the material of which the conductor is composed. --> FALSE.

The resistance of a conductor (R) is actually inversely proportional to the conductivity of the material:

$R\propto \frac{1}{\sigma}$

where $\sigma$ is the conductivity.

D)A material that obeys Ohm's law reasonably well is called an ohmic conductor or a linear conductor --> TRUE.

For ohmic conductors, the relationship between voltage and current is linear, and it is given by Ohm's law:

$V=RI$

where V is the voltage, I the current, and R the resistance.

E)Good conductors of electricity have larger conductivity values than insulators. --> TRUE.

Conductivity is the reciprocal of resistance: the higher the conductivity, the better the material conducts electricity. So, good conductors have high conductivity, while insulators (which do not conduct electricity) have high resistance and low conductivity.

5 0

3 years ago