Saeed moves 50 m east then 65 m south to reach the garden. What is the displacement of Saeed?​

Answer:

Significant figures are the number of digits in a value, often a measurement, that contribute to the degree of accuracy of the value. We start counting significant figures at the first non-zero digit. Calculate the number of significant figures for an assortment of numbers.

Explanation:

any of the digits of a number beginning with the digit farthest to the left that is not zero and ending with the last digit farthest to the right that is either not zero or that is a zero but is considered to be exact. — called also significant figure.

Answer:

d. Two soccer balls that are touching each other

Explanation:

Let [tex]m_1[/tex] be the mass of a tennis ball, [tex]m_2[/tex] is the mass of a soccer ball.

As the mass of a soccer ball is more than the mass of a tennis ball, so

[tex]m_2 > m_1[/tex]

Let [tex]d_1[/tex] be the distance between the centers of both the balls near each other and [tex]d_2[/tex] be the distance between the centers of both the balls touching each other.

So, [tex]d_2 > d_1[/tex]

The gravitational force, F, between the two objects having masses M and m and separated by distance d is

[tex]F=\frac{GMm}{d^2}[/tex]

Where G is the universal gravitational constant.

As, the gravitational force is directly proportional to the product of both the masses and inversely proportional to the square of the distance between them,  so selecting the larger mass ([tex]m_2[/tex], soccer ball) separated by a lesser distance ([tex]d_2[/tex], touching) to get more gravitational force.

Therefore, there will be a larger gravitational force between them when two soccer balls touching each other.

Hence, option (d) is correct.

Answer:

Two soccer balls that are touching each other

Explanation:

I got it right on the test.

Answer:

The force of gravitational will decreases by a factor of 4

Explanation:

The given parameters are;

The symbol that represents the given mass = m

The mass of the circular ring = M

The initial distance of the mass "m" located at the point P from the center O = h

The final distance of the mass "m" when moved further away from point O = 2·h

Given that h = r, we have;

[tex]The \ initial \ gravitational \ force, F_1 =G \cdot \dfrac{M \cdot m}{r^{2}}[/tex]

Therefore, when OP = 2·h, we have;

OP = 2·r and the new gravitational force, F₂, is given as follows;

[tex]F_2 =G \cdot \dfrac{M \cdot m}{(2\cdot r)^{2}} = G \cdot \dfrac{M \cdot m}{4\cdot r^{2}} = \dfrac{1}{4} \times G \cdot \dfrac{M \cdot m}{r^2} = \dfrac{1}{4} \times F_1[/tex]

[tex]\therefore F_2 = \dfrac{1}{4} \times F_1[/tex]

Therefore, when the mass, m, is removed such that OP = 2h, the value of the gravitational force decreases by a factor of 4.

Answer:

30×6=n

Explanation:

30 students in her class× 6 = number of students in the entire 4th grade.

Answer:

Their resultant force magnitude on the sleigh is approximately 583.095 N

Explanation:

The given parameters are;

The magnitude and direction in which the two reindeer-in-training pull on the sleigh are;

The force with which Connie pulls on the sleigh, F₁ = 200 N

The direction in which Connie pulls on the sleigh = 60° above the x-axis

The force with which Randolph pulls on the sleigh, F₂ = 800 N

The direction in which Connie pulls on the sleigh = 60° below the x-axis

The vector form of the force with which the two reindeer-in-training pulls the sleigh is given as follows;

[tex]\underset{F_1}{\rightarrow}[/tex] = 200 × cos(60°)·i + 200 × sin(60°)·j = 100·i + (100·√3)·j

[tex]\underset{F_2}{\rightarrow}[/tex] = 800 × cos(60°)·i - 800 × sin(60°)·j = 400·i - (400·√3)·j

The resultant force, R = [tex]\underset{F_1}{\rightarrow}[/tex] + [tex]\underset{F_2}{\rightarrow}[/tex]

∴ R = 100·i + (100·√3)·j + 400·i - (400·√3)·j = 500·i - (300·√3)·j

Their resultant force magnitude on the sleigh, [tex]\left | R \right |[/tex] = √(500² + (-300)²) ≈ 583.095 N

The direction of the resultant force = arctan(-300/500) = arctan(-0.6) ≈ -30.964 which is approximately 30.964° below the x-axis.

Answer:

the ceiling

Explanation:

i dont know man but thats what my swimming instructor said, but i havent swam in like 3 years so ..

Answer:

B and D

Explanation:

If it has letters.

Answer:

This depends on the writers

if they want they can make spiderman deny the laws of nature

Answer: A  a mechanical wave travels through empty space, while an electromagnetic wave travels through matter.

Explanation: A mechanical wave travels through empty space, while an electromagnetic wave travels through matter. A mechanical wave has a short wavelength, while all electromagnetic waves have long wavelengths.

Answer:

D. F = 24000[N]

Explanation:

To be able to calculate the force we must first find the pressure at the bottom of the tank. By means of the following equation:

[tex]P=Ro*g*h[/tex]

where:

Ro = density of the liquid = 800 [kg/m³]

g = gravity acceleration = 9.81 [m/s²]

h = elevation = 1.2 [m]

[tex]P=800*9.81*1.2\\P=9417.6[Pa][/tex]

Pressure is defined as the relationship between Force on the area.

[tex]P=F/A\\F=9417.6*2.5\\F = 23544 [N] = 24000[N][/tex]

Answer:

C.) 7.9 km

Explanation:

Distance and Displacement

An object who constantly travels for some distances at defined periods of time has a total distance as the sum of each individual distance the object traveled. It can be written as:

dtotal=d1+d2+d3+...+dn

This sum is obtained independently of the direction the object moves.

The displacement only takes into consideration the initial and final points of the path defined by the object in its moving. The displacement, unlike distance, is a vectorial magnitude and can be even zero if the object starts and ends the movement at the same point.

Dr. Suarez walks 2.8 km north and then 5.1 km south. The total distance is simply the sum of both distances: 2.8 km + 5.1 km = 7.9 km.

Note the distance does not have any direction (north or south), it's just the number.

Answer: C.) 7.9 km

Answer:

  D.  No, because the student needs to know the direction that the force is applied

Explanation:

The change in momentum depends on the direction of the force as well as its magnitude. Since the graph only supplies force magnitude information, it is insufficient to allow the student to calculate the change in momentum.

Answer:

40kg

Explanation:

that the answer

Answer: b. infrared

Explanation:

The visible light with the smaller frequency is associated with the color red.

While the blue is the one with the larger frequency.

Now, as the name says, infrared waves are the ones with a frequency just below the one of the red visible light.

Where the frequency of the red light is something around (4.3*10^14 Hz)

and the frequency of the infrared waves is in the range between (10^12 Hz and 10^14 Hz)

Then the correct option is b, infrared.

Answer:

12.5

Explanation:

If the half life is 25 days then in 50 days it will half twice

50/2=25

25/2=12.5

Answer:

to be balanced moments should be equal

4m

Explanation:

[tex]fd = fd \\ 600 \times 2 = 300 \times x \\ \frac{600 \times 2}{300} = x \\ 4m[/tex]

Answer:

4m

Explanation:

fd=fd

600×2× x

300

4m ans

Explanation:

There is a force of 3N acting towards the left and 2 forces of 4N each acting towards the right.

Net force = (4N) + (4N) - (3N) = 5N towards the right.

P.S. We subtract the 3N force because the forces are in opposite directions.

Answer:

6.2 ×10^-25

Explanation:

Ma = mg

a = (m/M)g

[tex]a = \frac{0.38}{5.98 \times {10}^{24} } \times 9.8 = 6.2 \times {10}^{ - 25} [/tex]

Answer:

P = 53375[W]

Explanation:

First, we must use the following equation of kinematics, which allows us to calculate the acceleration value.

[tex]v_{f}=v_{o}+a*t[/tex]

where:

Vf = final velocity = 34 [m/s]

Vo = initial velocity = 27 [m/s]

a = acceleration [m/s²]

t = time = 6 [s]

Now replacing:

[tex]34=27+a*6\\a=1.167[m/s^{2} ][/tex]

Now we must use Newton's second law, which tells us that the sum of forces is equal to the product of mass by acceleration. In this way, we have the following equation.

ΣF =m*a

where:

F = force [N]

m = mass = 1500 [kg]

a = acceleration = 1.167 [m/s²]

[tex]F=1500*1.167\\F=1750[N][/tex]

Power is defined as the product of force by speed. But we have two speeds, the initial and the final. We must use the average speed to be able to estimate the power needed.

[tex]V_{average}=\frac{34+27}{2} =30.5[m/s][/tex]

And the power:

[tex]P=F*V_{average}\\P=1750*30.5\\P=53375[W][/tex]

Answer:

B) they have been proven to cause drowsiness

Explanation:

B is the only answer that makes sense, as the other answers do not make sense.  All medications are scientifically tested before they can be used by someone.  Covering their bases would show negligence and is bad.

Hope this helps!

PS, this is biology or medical, not physics.

Answer:

No. of electrons = 88

Explanation:

Given that,

No. of protons = 88

No. of neutrons = 226

We need to find the number of electrons it have in a radium atom.

In an atom, the number of protons is equal to the number of electrons. There are 88 protons in this case.

Hence, there are 88 electrons in the radium atom.

Answer:

Sound waves in air (and any fluid medium) are longitudinal waves because particles of the medium through which the sound is transported vibrate parallel to the direction that the sound wave moves. A vibrating string can create longitudinal waves as depicted in the animation below.

Answer:

DP = 56 [kg*m/s]

Explanation:

We know that momentum is defined by the product of mass by Velocity. In this way by means of the following equation, we can calculate the impulse.

[tex]P=m*v\\[/tex]

where:

P = momentum [kg*m/s]

m = mass [kg]

v = velocity [m/s]

Now replacing:

[tex]P=8*9\\P=72[kg*m/s][/tex]

And after the ball hits the wall:

[tex]P_{2}=8*2\\P_{2}=16[kg*m/s][/tex]

The change in momentum is equal to:

[tex]DP=72-16\\DP = 56 [kg*m/s][/tex]

Answer:

b

Explanation:

Answer:

A car engine has more power than a horse because a car engine does the same amount of work in time. Yasmin and Raj each had 10 boxes of equal weight to stack next to each other on the same shelf, at the same height and in the same arrangement. Yasmin completed the task in 2 minutes, while Raj took 3 minutes to stack his boxes. Raj applied less power than Yasmin because his stacking took more time to do the same amount of work.

Explanation:

A car engine has more power than a horse because a car engine does the same amount of work in less time. Raj applied less power than Yasmin because his stacking took more time to do the same amount of work.

The quantity of energy moved or converted per unit of time is known as power in physics. The watt, or one joule per second, is the unit of power in the International System of Units. Power is also referred to as activity in ancient writings. A scalar quantity is power.

Energy divided by time represents the dimension of power. The watt (W), which equates to one joule per second, is the unit of power in the International System of Units (SI).

Another popular unit of measurement is horsepower (hp), which is equivalent to a horse's power; one mechanical horsepower is equal to around 745.7 watts.

Learn more about power here:

https://brainly.com/question/29575208

#SPJ5

Answer:

Distance 50m

final velocity 20ms^-1

[tex]s = ut + \frac{1}{2} a {t}^{2} \\ = 0 \times t + \frac{1}{2} \times 4 \times {5}^{2} = 50m[/tex]

[tex]v = u + at \\ v = 0 + 4 \times 5 \\ v = 20ms^{ - 1} [/tex]

Answer:

4.71m/s

Explanation:

Given parameters:

Distance covered  = 40.5m

Time taken  = 8.6s

Unknown:

Speed  = ?

Solution:

The speed of Samantha is the distance divided by the time taken.

  Speed  = [tex]\frac{Distance}{time}[/tex]  

 Now insert the parameters;

   Speed  = [tex]\frac{40.5}{8.6}[/tex]   = 4.71m/s

Answer:

-3m+7m =  4m

Explanation:

As he walks south, he is going down 3m (-3m). Then he walks up 7m (+7m).

You subtract the final position from the initial position to get displacement.

7m - 3m = 4m

Answer:

✔ convergent

Explanation:

Answer:

B ( Convergent)

Explanation: