Evaluate the expression a+b when a=23 and b=45 . Write in simplest form

What is the magnitude of the gravitational force of attraction between two 0.425-kilogram soccer balls when the distance between

Vitek1552 [10]

In the Newtonian theory of gravitation, the effects of gravity are always attractive, and the resulting force is calculated with respect to the center of gravity of both objects. The law of universal gravitation formulated by Isaac Newton postulates that the force exerted by a point particle with mass M on another with mass m is directly proportional to the product of the masses (and the Universal Gravitation Constant), and inversely proportional to the square of the distance (r) that separates them:

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

$F = \frac{(6.67*10^{-11})(0.425)(0.425)}{0.5^2}$

$F = 4.819*10^{-11}N$

$F \approx 4.82*10^{-11}N$

Therefore the correct answer is 2.

7 0

3 years ago

The bulk modulus of water is B = 2.2 x 109 N/m2. What change in pressure ΔP (in atmospheres) is required to keep water from expa

Aneli [31]

Answer:

A change of 160.819 atmospheres is required to keep water from expanding when it is heated from 10.9 °C to 40.0 °C.

Explanation:

The bulk modulus of water ( $B$ ), in newtons per square meters, can be estimated by means of the following model:

$B = \rho_{o}\cdot \frac{\Delta P}{\rho_{f} - \rho_{o}}$ (1)

Where:

$\rho_{o}$ - Water density at 10.9 °C, in kilograms per cubic meter.

$\rho_{f}$ - Water density at 40 °C, in kilograms per cubic meter.

$\Delta P$ - Pressure change, in pascals.

If we know that $\rho_{o} = 999.623\,\frac{kg}{m^{3}}$ , $\rho_{f} = 992.219\,\frac{kg}{m^{3}}$ and $B = 2.2\times 10^{9}\,\frac{N}{m^{2}}$ , then the bulk modulus of water is:

$\Delta P = B\cdot \left(\frac{\rho_{f}}{\rho_{o}}-1 \right)$

$\Delta P = \left(2.2\times 10^{9}\,\frac{N}{m^{3}} \right)\cdot \left(\frac{992.219\,\frac{kg}{m^{3}} }{999.623\,\frac{kg}{m^{3}} }-1 \right)$

$\Delta P = -16294943.19\,Pa \,(-160.819\,atm)$

A change of 160.819 atmospheres is required to keep water from expanding when it is heated from 10.9 °C to 40.0 °C.

6 0

3 years ago

1-A boy rolls a toy car across a floor with a velocity of 3.21 m/s. How long does it take the car to travel a distance of 4.50 m

Maurinko [17]

B 4.5/3.21 = 1.4
B 3600/2.95 = 1220
D 5.4*1000=1113.4/60=18.6
D 60*1.3=78*60=4,680*134=627,120
B 15.7*1000=15,700/18=872

4 0

3 years ago

Question 1

kakasveta [241]

Answer:

W = 600 J

Explanation:

We have,

According to attached figure,

Height of the inclined plane is 60 m

Force acting on the block is 10 N

It is required to find the work must be done against gravity to move it to the top of the incline. The work done is given by :

W = mgh

or

$W=F\times h\\\\W=10\times 60\\\\W=600\ J$

So, the work done against the gravity is 600 J.

3 0

3 years ago

A bicyclist covers the first leg of a journey that is d1meters in t1seconds at a speed of v1m/s and the second leg of d2meters i

Murljashka [212]

According to motion in straight line t1≠t2

A biker travels d1 meters in t1 seconds at v1 m/s for the first leg and d2 meters in t2 seconds at v2 m/s for the second leg. It's possible that t1t2 if his average speed is equal to the average of v1 and v2.
An object is said to be in motion if its position in relation to its surroundings changes over time. It is a shift in an object's position over time. The only type of motion that exists is motion in a straight line.

A reference system is constantly used to describe a particle's motion. An arbitrary origin point is used to create a reference system, and a coordinate system is imagined to be connected to it. The reference system for a specific problem is the coordinate system that has been selected for it. For the majority of the problems, we typically select an earth-based coordinate system as the reference system.

To learn more about Motion in straight lines please visit -brainly.com/question/17675825
#SPJ1

4 0

2 years ago