Answer:
114.29sExplanation:
average speed = distance/Time
Given
speed = 7m/s
distance = 800m
Required
Time taken by the runner to complete the race
From the formula:
Time = Distance/speed
Time = 800/7
Time = 114.29seconds
Hence it took the runner 114.29s to complete the race
What is the momentum of a 200 kg football player running west at a speed of 8m/s
Answer:
The answer is 1600 kgm/sExplanation:
The momentum of an object can be found by using the formula
momentum = mass × velocityFrom the question
mass = 200 kg
velocity / speed = 8m/s
We have
momentum = 200 × 8
We have the final answer as
1600 kgm/sHope this helps you
Does the mean molecular speed change as much as the temperature as the water heats up?
1.) A hover disc is moving across a wooden floor with a constant velocity and virtually no friction. The soccer
disc runs into a baseball, which applies a force of 5 N opposing the motion of the disc. What will happen to
the soccer discs velocity
Answer:
The soccer discs will be change.
Explanation:
Given that,
Opposing force = 5 N
We know that,
Drag force :
Drag force is directly proportional to the square of velocity.
[tex]F_{d}\propto v^2[/tex]
[tex]F_{d}=\dfrac{1}{2}C\rho Av^2[/tex]
Where, C = drag constant
[tex]\rho[/tex] = density
A = area
v= velocity
We need to find what happen to the soccer discs velocity
According to drag force,
If we applies a force of 5 N opposing the motion of the disc then the velocity of the soccer discs will be change.
Hence, The soccer discs will be change.
what does acceleRation measure
Answer:
Speed and distance traveled
Explanation:
A train accelerates at -1.5m/s for 10 seconds if the train had an initial speed of 32 m/s what is it's new speed
a) Gamma Rays
b) X-Rays
c) Visible Light
d) Microwaves
Answer:
A. Gamma rays
or D. microwaves
Explanation:
correct me if i am wrong
We know the moon circulates the Earth. Suppose the mass of the Earth and moon are 5.9742 x1024 kg and 7.36 x 1022 kg, whereas the radius of the orbit is 382171 km. What will the gravitational force between the Earth and the moon?
Answer:
The gravitational force between two objects, one of mass M1 and the other of mass M2, is:
F = G*M1*M2/R^2
Where G is a constant:
G = 6.6x10^11 m^3*/(kg*s^2)
And R is the distance between the two objects.
M1 = 5.9742x10^24 kg
M2 = 7.36x10^22 kg
R = 382171 km = 382171000 m
Then the gravitational force is:
F = 6.6x10^-11 m^3*/(kg*s^2)*(5.9742x10^24 kg)*(7.36x10^22 kg)/(382171000 m)^2
F = 1.987x10^20 N
Need HELP ASAP!!!!!!
what is the role of energy in the conversation about climate change?
Answer:
Energy plays an important role in many aspects of our lives. For example, we use electricity for lighting and cooling.
Explanation:
Answer:
engery
Explanation:
You use a knife to cut a piece of bread. What kind of simple machine are you
using?
A. Wedge
B. Inclined plane
C. Screw
O D. Lever
Answer:
the answer is A.) Wedge
A knife to cut a piece of bread is a A. Wedge
What is a simple machine?
A simple machine, any of several devices with few or no moving parts that are used to modify motion and the magnitude of a force in order to perform work.
since , a wedge is a simple machine with two inclined planes which when put together forms a sharped edge, which forms a triangular shaped tool which can be used to separate portion of two objects .
hence , a knife to cut a piece of bread is a A. Wedge
learn more about simple machine
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Which value is NOT equivalent to the others?
Multiple choice question.
A)
5 × 1011 nm
B)
0.5 km
C)
500 m
D)
5000 cm
Answer:
A) 5 × 1011nm
I think It's A
Which of the following statements best describes why the mass of a bowling ball would not change if it were transported from Earth to the Moon?
Gravity is a constant force
The bowling ball wil adapt to the changes in gravity
Matter is resistant to acceleration and changes in gravity
The amount of matter in the bowling all remains the same
Answer:
D hope this helps
Explanation:
Answer:
D
Explanation:
The amount of matter in the bowling ball remains the same.
True or False: The average American man and woman is overweight
Answer:
True
Explanation:
The average American is inching closer to being obese, CDC data shows. In overall weight, men gained an average of 8.5 pounds and women an average of 6.8 pounds between 1999 and 2016. In overall weight, men gained an average of 8.5 pounds and women an average of 6.8 pounds between 1999 and 2016.
An object is tossed downward at 5 m/s. How far will it go after 3 s?
please respond quick
Answer:
The answer is 15 mExplanation:
The distance covered by an object given it's velocity and time taken can be found by using the formula
distance = velocity × timeWe have
distance = 5 × 3
We have the final answer as
15 mHope this helps you
Calculate the kinetic energy of a 20-kg sled moving 28.0 m/s.
The kinetic energy of the moving sled with the given value of mass and velocity is 7.84 × 10³ Joules.
What is Kinetic Energy?Kinetic energy is simply a form of energy a particle or object possesses due to its motion.
It is expressed as;
K = (1/2)mv²
Where m is mass of the object and v is its velocity.
Given the data in the question;
Mass of the sled m = 20kgVelocity of the sled V = 28.0m/sKinetic energy of the train K = ?To determine the kinetic energy of the sled, we substitute our given values into the above expression.
K = (1/2)mv²
K = (1/2) × 20kg × (28.0m/s)²
K = 0.5 × 20kg × 784m²/s²
K = 7840kgm²/s²
K = 7.84 × 10³J
Therefore, the kinetic energy of the moving sled with the given value of mass and velocity is 7.84 × 10³ Joules.
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PLEASE HELP I’ll GIVE BRAINLIEST
Equi-potential surface are surface that are………
Select one:
a. zero
b. the same electric potential
c. different electric potential
d. not dependent on constant radius
Answer:
b is the answer
Explanation:
The surface which is the locus of all points which are at the same potential is known as the equipotential surface.
The surface which is the locus of all points which are at the same potential is known as the equipotential surface.In other words, any surface with the same electric potential at every point is termed as an equipotential surface.
The 50-mm-diameter cylinder is made from Am 1004-T61 magnesium and is placed in the clamp when the temperature is T1 = 15°C. If the two 304-stainless-steel carriage bolts of the clamp each have a diameter of 10 mm, and they hold the cylinder snug with negligible force against the rigid jaws, determine the temperature at which the average normal stress in either the magnesium or the steel first becomes 12 MPa.
Answer:
The temperature of steel first becomes 12 MPa at a temperature of 18.65°C
Explanation:
Given that,
Diameter = 50 mm
Temperature = 15°C
Diameter = 10 mm
Stress = 12 MPa
We need to calculate the temperature of steel
Using formula of stress
[tex]stress=\alpha Y\Delta T[/tex]
Where, Y = young modulus
T = temperature
[tex]\alpha[/tex]= coefficient of linear expansion of the material
Put the value into the formula
[tex]12\times10^{6}=17.3\times10^{-6}\times190\times10^{9}\times(T_{2}-15)[/tex]
[tex](T_{2}-15)=\dfrac{12\times10^{6}}{17.3\times10^{-6}\times190\times10^{9}}[/tex]
[tex]T_{2}=3.650+15[/tex]
[tex]T_{2}=18.65^{\circ}[/tex]
We need to calculate the temperature of magnesium
Using formula of stress
[tex]stress=\alpha Y\Delta T[/tex]
Put the value into the formula
[tex]12\times10^{6}=25.2\times10^{-6}\times45\times10^{9}\times(T_{2}-15)[/tex]
[tex](T_{2}-15)=\dfrac{12\times10^{6}}{25.2\times10^{-6}\times45\times10^{9}}[/tex]
[tex]T_{2}=10.5+15[/tex]
[tex]T_{2}=25.58^{\circ}[/tex]
Hence, The temperature of steel first becomes 12 MPa at a temperature of 18.65°C
What does the color of a star indicate
Answer:
Its temperature
Explanation:
Answer:
The stars age
Explanation:
As stars age, they run out of hydrogen to burn, decreasing the amount of energy they give off. So the younger stars can look bluer while older ones look more red.
Hope this helps :3
George weighs 200 lb. what is his weight in Newtons (think metric, ha ha 1 kg=2.2 lb)
Answer:
889.644 newton
Explanation:
multiply the pound value by 4.448
The amplitude of a sound wave in air is doubled
Does the loudness increase decrease or stay the same?
Does the speed of the sound wave increases decreases or stay the same?
What is the current in a 160V circuit if the resistance is 20Ω
Answer:
I =V/R
I= 160/20 = 8 Amperes
If you apply a net force of 3 N on 100g -box, what is the acceleration of
the box? *
30 m/s/s
20 m/s/s
10 m/s/s
5 m/s/s
Answer:
I believe the correct answer is 30m/s/s
An object accelerated at a rate of 50 m/s/s. A force of
100 N was used to make this happen. What is the mass
of the object?
Answer:
2kg
Explanation:
100N= force 50m/s²=acceleration
mass=?
the equation is;
Mass(kg)= Force(N) ÷ Acelleration(m/s²)
100÷50=2
if an object is moving and it changes its position by 2 m in every 4 s starting from the origin, then the position vs. time graph will be
Answer:
a straight line with a positive slope
Explanation:
A battery of emf 24v and terminal resistance 4 ohms is connected to a resistor of 32 ohms. What is the terminal pd of the battery?
Answer:
21.3V
Explanation:
Explanation
E = V + Ir
V = E- Ir
V = 24 - {(24/36) x 4}
V = 21.3V
After measurements or observations are made in a scientific investigation, it is most appropriate to
A.
formulate a hypothesis.
B.
draw a conclusion.
C.
organize the data in a chart or table.
D.
propose a new scientific question.
Answer:
The real answer is C : organize the data in a chart or a table.
A loaf of bread bakes in an oven. The bread is on a rack about one foot above the heat source. However, the top of the bread cooks just as fast as the bottom. How is heat being added to the bread?
Answer:
the bread is getting heated from top and bottom because the oven is heated all over and the particles from the oven makes the bread's particles heat up and the bread will be done
Explanation:
i have the same answer
Answer:
The air is heated by the heat source in the oven. The hot air rises, surrounds the bread, and heats the bread on all sides.
Explanation:
(15 POINTS!!! 8th GRADE!!!!)can someone tell me what anaerobic exercise is? trying to bring grades up
Answer:
here
Explanation:
Anaerobic exercise is any activity that breaks down glucose for energy without using oxygen. Generally, these activities are of short length with high intensity. The idea is that a lot of energy is released within a small period of time, and your oxygen demand surpasses the oxygen supply.
A body moves with a velocity of 30.0 m/s.
This speed is increased to 40 m/s in 4.0s.
Calculate
a) the average acceleration of the body.
b) the distance covered by the body.
20. Give an example of sublimation.
Answer:Explanation:
A common example of sublimation is the dry ice, heavy CO2.
