You push on a desk with a force of 150 N to the right. Your friend pushes on the same desk with a force of 50 N to the left . What is the net force?
Answer:
The net force is 100 N to the right.
Explanation:
To solve this problem, we simply add together the forces. Since we know that there is a greater force to the right, we will designate this as the positive direction and the left as the negative direction.
To find the net force, let's add together the two forces we are given using our new positive/negative designations:
+150 N right - 50 N left
Now, we just perform simple subtraction to get:
100 N right
Therefore, the answer is that the net force is 100 N to the right.
Hope this helps!
Find the acceleration of a car that goes from 32 m/s to 96 m/s in 8.0s
Answer:
8m/s²
Explanation:
acceleration = v-u/t
=(96-32)/8
=64/8
=8m/s²
The acceleration of the car as it goes from 32 m/s to 96 m/s is 8 m/s².
What is acceleration?
Acceleration is defined as the rate of change of velocity with respect to time. Mathematically -
a = Δv/Δt
Given is a car that goes from 32 m/s to 96 m/s in 8.0s.
We can calculate the acceleration using the formula discussed above as follows -
a = Δv/Δt
a = (v - u)/Δt
a = (96 - 32)/8
a = 64/8
a = 8 m/s²
Therefore, the acceleration of the car as it goes from 32 m/s to 96 m/s is 8 m/s².
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A ball is dropped , find the velocity after 100 m
Answer:
Vf = 44.27 m/s
Explanation:
When a ball is dropped it is acted upon by gravitational force under free fall motion. So, in order to find its final speed we use 2rd equation of motion, as follows:
2gh = Vf² - Vi²
where,
g = acceleration due to gravity = 9.8 m/s²
h = height lost = 100 m
Vf = Final Velocity = ?
Vi = Initial velocity = 0 m/s (Since, ball starts from rest)
Therefore,
(2)(9.8 m/s²)(100 m) = Vf² - (0 m/s)²
Vf = √(1960 m²/s²)
Vf = 44.27 m/s
Earlier in this lesson, you spent some time thinking about events that involve matter and energy. Consider balls of different shapes and materials that reach different heights as they bounce off the same floor. What aspect of this event relates to matter? What aspect relates to energy? Font Sizes
Answer:
See the answer below
Explanation:
The aspect of the event that relates to matter is the materials and different shapes of the balls while the aspect that relates to energy is the heights reached by the balls as they bounce off the same floor.
Matter is generally defined as any substance that has weight and is able to occupy space. Hence, the balls being made up of different materials and shapes means that they are made up of matter.
Energy, however, is generally defined as the capacity to do work. The more the energy of a system, the more the work that can be done by the system. The height reached by the balls is thus an indication of the amount of energy possessed by the balls.
Sample Answer on Edmentum
The materials that the balls are made of relate to matter. The motion of the balls—and the way that energy changes form as the ball moves up and down—relates to energy.
A rock is dropped from a height of 371 m. Approximately how much time will it take for the rock to hit the ground ? (Assume no air resistance.)
Answer:
1hr I guess is the best answer
pls help
will give the brainliest!
Urgent!!!!
please answer correctly
Electrons
Coulomb
Energy
Resistance
Lower
what is the law of gravitation
Answer:
Newton's paw of universal gravitation states that a particle attracts every other particle in the universe using a force that is directly proportional to the product of their masses and inversely proportional to the square of the distance in between them
A uniformly charged rod (length = 2.0 m, charge per unit length = 3.0 nC/m) is bent to form a semicircle. What is the magnitude of the electric field at the center of the circle? Select one: O a. 64N/C b. 85N/C c. 34N/C 3 d. 133Njc -j e.48N/C
Answer:
The magnitude of the electric field at the center of the circle is 85 N/C
The correct option is b. 85 N/C
Explanation:
Please see the attachments below
When velocity is positive and acceleration is negative, what happens to the object's motion?
Answer:
Explanation:
Acceleration is negative, if object is going forward, speed decreases, if object is going backwards, speed increases.
Hope this helped!
Have a great day!
If the acceleration and velocity have the same sign, the object will accelerate. If the acceleration is of the opposing sign as the velocity, the object will slow down.
What is acceleration?Acceleration is the rate at which velocity changes over time, both in terms of speed and direction. A point or object moving in a straight line is accelerated if it accelerates or decelerates.
A positive velocity is assigned to an object that moves in the positive direction. When an object accelerates, its acceleration vector is directed in the same direction as its motion (in this case, a positive acceleration).
A positive velocity is assigned to an object that moves in the positive direction. When an object slows down, its acceleration vector is oriented in the opposite direction as its motion (in this case, a negative acceleration).
Thus, When velocity is positive and acceleration is negative, the object's motion will slow down.
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If length of wire is doubled keeping the diameter constant ,its Youngs modulus will be
Answer:
Y = Stress / Strain = (F / A) / (l / L) where l is the change in length
Since L is doubled and A remains the same one would expect l, the change in length to also double so Y remains the same.
As an example think of hanging a weight from a spring and the same weight from a similar spring of twice the length - one would expect the longer spring to show twice the extension of the shorter spring.
Your physics teacher is giving you a special gift a box of mass 20 kg with a mystery surpise insie .the box is placed on a frictionsed table .what is the weigth of the box and normal reaction over it by the table ?
Answer:
F = 196.2 N
Explanation:
Use Newtons law
F = m * a
F = 20 kg * 9.81 m/s²
F = 196.2 N
Answer:
[tex]\Huge \boxed{\mathrm{196.2 \ N}}[/tex]
[tex]\rule[225]{225}{2}[/tex]
Explanation:
Using weight formula:
[tex]\sf Weight = mass \times acceleration \ of \ gravity[/tex]
[tex]W=mg[/tex]
The mass of the box is 20 kg.
The acceleration of gravity on Earth is 9.81 m/s².
[tex]W=(20)(9.81)[/tex]
[tex]W=196.2[/tex]
The weight of the box is 196.2 N.
The net force of the box is zero, since the box is at rest. The normal force is exerted upward on it by the table.
[tex]\rule[225]{225}{2}[/tex]
Runner A is initially 5.7 km west of a flagpole and is running with a constant velocity of 8.8 km/h due east. Runner B is initially 4.2 km east of the flagpole and is running with a constant velocity of 7.6 km/h due west. How far are the runners from the flagpole when their paths cross? Answer in units of km.
Answer:
0.39 km west
Explanation:
The position of Runner A is:
x = -5.7 + 8.8 t
The position of Runner B is:
x = 4.2 − 7.6 t
When the positions are equal:
-5.7 + 8.8 t = 4.2 − 7.6 t
16.4 t = 9.9
t = 0.604
Plug into either equation to find the position at this time:
x = -5.7 + 8.8 (0.604)
x = -0.39
The runners are 0.39 km west of the flagpole when they meet.
which of the following is the longest distance A 5000 centimeters B 30 000 millimeters C 500 meters D 0.400 kilometers
Answer:
C
Explanation:
first we convert km,m,cm into mm then compare them
The longest distance is 0.400 Km among all the given distances. Therefore, option (D) is correct.
What are SI units of metric length?The metric system can be defined as a system that is used for the measurement that uses the liter, meter, and gram as base units of length, capacity, and weight respectively.
In the metric system, the SI unit of length is represented as a meter which can be defined as the metric length that is traveled by light in a vacuum within 1⁄29979258 seconds.
Some of the other units of distance include Kilometres, Millimetres, nanometers, Centimetres, Meters, and Decimeters.
Conver all the given distance into meters:
A) 5000 cm = 5000 × 10⁻² m = 50 m
B) 30000 mm = 30000 × 10⁻³ m = 30 m
C) 500 m = 500 × 1 = 500 m
D) 0.400 Km = 0.4 × 10³ = 400 m
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In the Bathburst 1000, racing cars take 6.25 hours to complete the 1000km race. Race is their average speed?
Answer:
160
Explanation:
1000 divided by 6.25
(ab/bc, non-calculator) the position function 2 st t ( ) 4.9 396.9 , gives the height (in meters) of an object that has fallen from a height of 396.9 meters after t seconds. (a) explain why there must exist a time t , 1 2 t , at which the height of the object must be 382 meters above the ground. (b) find the time at which the object hits the ground. (c) find the average rate of change in s over the intervalt 8,9. include units of measure. explain why this is a good estimate of the velocity at which the object hits the ground. how can this estimate be improved? (d) evaluate: 3 ( ) (3) limt 3 st s t . show the work that leads to your answer. include units.
Answer:
a) y₁ = 392 m , y₂ = 377.3 m , t = 1.74 s , b) v = 83.39.8 m/s , c) v = 88.2 m/s
Explanation:
Unfortunately some data of your statement is not clear, I will try to help you as much as possible.
The equation for free fall of a body is
y = y₀ + v₀t -1/g t²
As the body is released, its initial velocity is zero, the value of the acceleration of g = 9.8 m / s², the resulting equation is
y = y₀ - 4.9 t²
a) From this equation we see that as time progresses the height decreases.
For t = 1s
y = 396.9 -4.9 1²
y₁ = 392 m
for t = 2 s
y = 396.9 - 4.9 2²
y₂ = 377.3 m
Let's find the time for the height of y = 382 m
t = √ (y₀-y) 4.9
t = √ [(396.9-382) / 4.9]
t = 1.74 s
b) when the object hits the ground y = 0
0 = y₀ - 4.9 t²
t = √ y₀ / 4.9
t = √ (396.9 / 4.9)
t = 9 s
c) the rate of change of the position is the velocity,
t = 8 s
y₈ = 396.9 - 4.9 8 2
y₈ = 83.3 m
t = 9 s
y₉= 396.9 -4.9 9 2
y₉ = 0 m
the average exchange rate
v = (x₈ -x₉) / Δt
v = (83.8 -0) / 1
v = 83.39.8 m / s
This is the average speed in the last interval so this average speed of this interval where it reaches the ground
c) The actual speed with which it reaches the ground
v = dy / dt
v = 2 (4.9) t
v = 9.8 t
for t = 9s
v = 9.8 9
v = 88.2 m / s
How to improve these results using shorter time intervals
A 1200N load is to be lifted with 200N effort using a first class lever. At what distance
from the fulcrum must the effort be applied when the load is 15 cm away from the
fulcrum?
[Ans: 90 cm]
Explanation:
Hey there!!
Let's simply work with it.
Here,
load = 1200N
Effort = 200N
Load distance = 15cm
We have,
According to the principle of lever.
L×LD = E×ED.
1200×15 = 200× ED.
18000 = 200ED.
[tex]ed = \frac{18000}{200} [/tex]
Therefore, Effort Distance = 90cm.
Hope it helps....
Find the total distance a car would travel if it moves 5 km East and then turns and travels 48 km West.
Answer:
53kmExplanation:
The total distance covered by the car will be the sum total of the distance moved during the journey.
Distance moved towards east = 5 km
Distance moved towards west = 48km
Total distance covered = Distance moved towards east+Distance moved towards east
Total distance covered = 5km+48km
Total distance covered = 53km
Hence the total distance a car would travel if it moves 5 km East and then turns and travels 48 km West is 53km
In the average US household, the television is on 6.75 hours/day! How many hours will have passed after 77.7 years (the average life
expectancy of an American)?
1 year - 365 days
680652 hrs
28360.5 hrs
5530683 hrs
0 3859376hes
Answer:
191433.4 hours
Explanation:
We are given that In the average US household, the television is on 6.75 hours/day! How many hours will have passed after 77.7 years (the average lifeexpectancy of an American)?
1 year - 365 days
Given that the television is on 6.75 hours/day.
If 1 year = 365 days
Convert 77.7 years to days by multiplying it by 365
77.7 × 365 = 28360.5 days
So the number of hours will be:
28360.5 × 6.75 = 191433.375 hours
Therefore, 191433.4 hours will pass.
Non of the options is correct.
Which type of electromagnetic wave is used for nuclear power and medical treatment
Answer:
Gamma rays is used for nuclear power and for medical treatment
What is the "symbol" and "unit" of Temperature?
A bus took 8 hours to travel 639 km. For the first 5 hours, it
travelled at an average speed of 72 km/h. What was the
average speed for the remaining time of the journey?
km/h
Answer:
93 km/h
Explanation:
Given that a bus took 8 hours to travel 639 km. For the first 5 hours, it travelled at an average speed of 72 km/h
Let the first 5 hours journey distance = F
From the formula of speed,
Speed = distance/time
Substitute speed and time
72 = F/5
F = 72 × 5 = 360 km
The remaining distance will be:
639 - 360 = 279km
The remaining time will be:
8 - 5 = 3 hours
Speed = 279/3
Speed = 93 km/h
Therefore, the average speed for the remaining time of the journey is equal to 93 km/h
why does light splits into different colours while passing through a prism
Answer:
Since different colours of light travel at different speeds, the refractive index is different for each colour. As a result, when light passes through the refracting surface of the prism,its components bend into different angles, causing the single beam of light to separate
Write the name of the instrument used to transform the energy from one form following. 1. Mechanical energy from electricity- 2. Electricity from chemicals-
Answer:
generatorbattery or cell:))
The amount of kinetic energy an object has depends on which feature
The amount of kinetic energy of an object depends upon the motion of the object and the mass of the object. Thus, the correct option is A.
What is the Kinetic energy?The kinetic energy is a form of energy which is present in a moving object. Kinetic energy of an object is the energy which it possesses due to its motion. This energy can be defined as the work which is needed to accelerate a body of a given mass from rest to its stated velocity. A body maintains a constant kinetic energy unless its speed changes.
The kinetic energy is a vector quantity as it has both the magnitude and the direction. Kinetic energy of a moving object can be calculated as it depends directly on its mass and velocity. It can be calculated with the equation:
KE = 1/2 × m × v²
where, KE = Kinetic Energy,
m = mass of the object,
v = velocity of the object
The unit of KE is same as work that is Joule (J).
Therefore, the correct option is A.
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Your question is incomplete, most probably the complete question is:
The amount of kinetic energy an object has depends on which feature of the object?
a. its motion
b. its position
c. its gravity
d. its height
A number n plus 7 is less than or equal to 9.
Answer:
n=2
Explanation:
n+7=9
n=9-7
n=2
+ -= -
Se deja caer una pelota inicialmente en reposo desde una altura de 50m sobre el nivel del suelo. ¿cuanto tiempo requiere para llegar al suelo? ¿cual sera la rapidez de la pelota justo en el momento anterior del choque ?
Answer:
a) t = 3.2 s
b) [tex]v_{f} = -32 m/s [/tex]
Explanation:
a) El tiempo requerido para llegar al suelo se puede calcular usando la siguiente fórmula:
[tex] t = \sqrt{\frac{2y_{0}}{g}} [/tex]
En donde:
[tex]y_{0}[/tex]: es la altura inicial = 50 m
g: es la gravedad = 10 m/s²
[tex] t = \sqrt{\frac{2y_{0}}{g}} = \sqrt{\frac{2*50 m}{10 m/s^{2}}} = 3.2 s [/tex]
Entonces, el tiempo requerido para llegar al suelo es 3.2 s.
b) La rapidez de la pelota justo antes del choque es el siguiente:
[tex] v_{f} = v_{0} - gt [/tex]
En donde:
[tex]v_{0}[/tex]: es la velocidad inicial = 0 (dado que se deja caer en resposo)
[tex] v_{f} = v_{0} - gt = 0 - 10 m/s^{2}*3.2 s = -32 m/s [/tex]
Por lo tanto, la rapidez de la pelota justo en el momento anterior del choque es -32 m/s (el signo negativo es porque la pelota está cayendo).
Espero que te sea de utilidad!
Which of the following can be a variable? Select all that are correct (Hint: Three are
correct)
a. F
b. X
c. 3
d. a
How do you find the number of ELECTRONS in an atom of an element?
Answer:
M-A=N
Explanation:
M-A=N
Here is an example.
The equation above means that the atomic number (A) subtracted from the average atomic mass (M) equals the combined amount of neutrons and protons. Since we know that 35 17Cl is Chlorine (this is because Chlorine (Cl) is the 17th number on the periodic table and has the average atomic mass of 35), we can insert our data into the equation and end up with the following:
35-17=18.
From here, we can tell that we have a mix of neutrons and protons, with the total being 18. Since the atomic number is 17, we can reasonably assume that there are 17 protons and 1 neutron.
But we still need to find the number of electrons. Fortunately, the number of electrons is always equivilant to the number of protons and the atomic mass, so we know that the number of electrons is 17.
So, we have;
17 Protons
1 Neutron
17 Electrons
What is the value of side "a" in the triangle shown below? (1 point)
A right triangle with an acute angle 30 degrees and side opposite this angle is labeled a. The hypotenuse is labeled 10.
Answer: 5
Explanation:
Answer:
5
Explanation:
Randy has a sheet of paper. He cuts a square out of the center. Which of the following physical properties of the paper changes
Answer:
Mass
Explanation:
Answer:
mass
Explanation: less room is taken up