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3 years ago

How many milliseconds are in 1 second

Physics

2 answers:

koban [17]3 years ago

3 0

There are 1000 milliseconds in 1 second

babymother [125]3 years ago

3 0

1000 milliseconds in 1 second

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The SI unit of power is the watt. Which of the following units are equivalent to the watt?

Llana [10]

Answer:

The right option is (A) V.A

Explanation:

Power: This is the rate at which work is done. Or it is the produce of force and velocity. The S.I unit of power is Watt (W). Other units include Horse power(hp), foot-pound per minutes, etc.

Generally, power can be represented as,

Power = Energy/time

P = W/t......................... Equation 1

Where p = power, w = Work or energy, t = time in seconds.

Electrical energy: This is the product of potential difference and the quantity of charge.

∴ W = VQ............................... Equation 2

Where V = potential difference, Q = quantity of charge and W = Energy or Work done.

Also Q = It........................ Equation 3.

where I = current in ampere, t = time in seconds

Substituting equation 3 into equation 3

W = VIt............................ Equation 4.

Also substituting Equation 4 into Equation 1

P = VIt/t = VI = voltage(V)×Current(A)

Therefore the equivalent unit of power is

P = V.A.

The right option is (A) V.A

3 0

3 years ago

A relief airplane is delivering a food package to a group of people stranded on a very small island. The island is too small for

strojnjashka [21]

speed of the plane is given as

$v = 442 km/h = 122.8 m/s$

height of the plane is

$h = 575 m$

acceleration due to gravity is

$g = 9.80 m/s^2$

part a)

when package is dropped its vertical speed is zero so we can use kinematics to find the time of drop

$\delta y = v_y * t + \frac{1}{2}gt^2$

$575 = 0 + \frac{1}{2}*9.80*t^2$

$t = 10.83 s$

Part b)

Horizontal distance moved by the package is given by

$\delta x = v_x * t$

$\delta x = 122.8 * 10.83$

$\delta x = 1330.3 m$

Part c)

final speed in x direction

$v_x = 122.8 m/s$

final speed in y direction

$v_y = 9.8*10.83 = 106.13 m/s$

so net speed as it hit the ground will be

$v = \sqrt{v_y^2 + v_x^2}$

$v = \sqrt{122.8^2 + 106.13^2}$

$v = 162.3 m/s$

5 0

3 years ago

A 1.94-m-diameter lead sphere has a mass of 5681 kg. A dust particle rests on the surface. What is the ratio of the gravitationa

scoundrel [369]

To develop this problem we will apply Newton's laws regarding gravitational forces, both in space and on earth. From finding this relationship, leaving the variable of the dust mass open, we will find the relationship of the forces between the two surfaces. Our values are,

$\text{Diameter of the lead sphere} = D=1.940m$

$\text{Mass of the lead sphere} = m_1 = 5681kg$

$\text{Mass of the dust particle} = m_2$

Distance between the center of lead sphere to dust particle

$r = \frac{D}{2}$

$r = \frac{1.940m}{2}$

$r = 0.97m$

Gravitational force of the sphere on the dust particle:

$F = \frac{Gm_1m_2}{r^2}$

$F = \frac{(6.67*10^{-11}N\cdot m^2/kg^2)(5681kg)(m_2)}{(0.97m)^2}$

$F = (4.027*10^{-7} N/kg)m_2$

Weight of the dust particle

$W = m_2 g$

$W = m_2 (9.8m/s^2)$

Ratio of F and W:

$\frac{F}{W} = \frac{(4.07*10^{-7}N/kg) m_2)}{m_2(9.8m/s^2)}$

$\frac{F}{W} = 4.153*10^{-8}$

Therefore the ratio is $4.153*10^{-8}$

3 0

3 years ago

Identify the object or objects in motion in each example of kinetic energy.

Leto [7]

Answer:

A speedy train

Explanation:

5 0

3 years ago

Read 2 more answers

If a skier travels at a constant velocity downhill, this means the forces on her are: ................. A. Zero B. Negligible C.

Vlad1618 [11]

Answer:

F = 0

Explanation:

The net force acting on an object is given by the product of mass and acceleration. We know that acceleration is equal to the rate of change of velocity.

Net force,

F = ma

$F=\dfrac{m(v-u)}{t}$

The skier is traveling at a constant velocity, it means there is no change in velocity i.e. acceleration is equal to 0. Hence, the force on her is 0.

7 0

3 years ago