Q2) A salesman travels a distance of 50km in 2 hours and 30 minutes. How much faster, in kilometers per hours, on an average, must he travel to make a trip in 5/6 hours less time)
A) 10
B) 20
C) 30
D) None of these
Explain how you got your answer
Answer:
30 maybe?
Explanation:
Answer:- 30 km/hr
Given :- Distance covered by Salesman 50 km
Time taken;- 2 hrs and 30 minutes
Speed of salesman: Distance/ time taken
50 / 2 1/2 = 20 km/hr
He has make it 5/6 less
2 1/2 —5 / 6 = 5 / 3 hrs
Speed : Distance / Time
50 km / 5/3 = 30
He has to travel at 30 km per hour.
If a 1 kg book has 46 Joules of gravitational potential energy how high is the shelf it is on?
g = 9.8 m/s^2 KE = ½ mv^2 PE = mgh
Answer:
4.7m
Explanation:
Given parameters:
Mass of the book = 1kg
Gravitational potential energy = 46J
Unknown:
Height of the shelf = ?
Solution:
The potential energy is due to the position of a body above the ground.
Gravitational potential energy = mgh
m is the mass,
g is the acceleration due gravity = 9.8m/s²
h is the height which is unknown
46 = 1 x 9.8 x h
h = 4.7m
The primary cause of weather is due to ______
in temperature around the Earth.
differences
similarities
coldness
abnormalities
Answer:
the answer is differences hope this helped :)
The main cause of weather is differences in temperature around the Earth.
What is the Weather?The weather could define the atmosphere. It could be either hot, cold, cloudy, or stormy. In the case of the earth, the phenomena of weather should arise at the bottom layer of the planet's atmosphere. Due to this, the main cause of the weather should be of differences.
learn more about earth here: https://brainly.com/question/17252385
explain the basic concept that involves projectiles
A force of 2700 N is exerted on a car by a tow truck. The car accelerated at a rate 1.63 m/s? What is the mass of the car?
Round the the 2nd decimal places!
Answer:
1656.44 kgExplanation:
The mass of the car can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{2700}{1.63} \\ = 1656.4417...[/tex]
We have the final answer as
1656.44 kgHope this helps you
The thymus gland plays an important role in the developing immune system of a child. It makes infection-fighting lymphocytes called
.
Answer:
give brainliest please
Explanation:
T- lymphocytes or T cells
Which object forms by the contraction of a large sphere
of gases causing the nuclear fusion of lighter elements
into heavier elements?
A box that weight 1000 N is lifted a distance of 20.0 m straight up by a rope and pulley system . The work is done in 10.0 seconds what is the power devloped
Answer:
P = 2,000 W
Explanation:
Work and Power
Work is the amount of energy transferred by a force over a distance. It's a scalar quantity, with SI units of joules.
If both the force F and displacement s are parallel, then we can use the equivalent scalar formula:
W=F.s
Power is the amount of energy transferred or converted per unit of time. In the SI, the unit of power is the watt, equal to one joule per second.
The power can be calculated as:
[tex]\displaystyle P=\frac {W}{t}[/tex]
Where W is the work and t is the time.
A box with a weight of 1,000N is lifted by s=20 m by a rope and pulley system. The system exerts a force equal to the weight of the box, thus F=1,000 N. The work done by the system is:
W =1,000 N * 20 m
W = 20,000 J
Now we calculate the power developed by the system in t=10 seconds:
[tex]\displaystyle P=\frac {20,000}{10}[/tex]
P = 2,000 W
Describe how charge is transferred from the ruler to the metal rod.
what would happen if you try to put two balloons with the same charge together
Answer:
they would repel because they have the same charge. Charges that are different will stick together.
1. How do humans get energy from food?
A Small intestine is where most food is first taken into cells
B. There can be thousands of mitochondria inside cells
Waste products like carbon dioxide are released through the lungs
D Energy is released through a series of steps in the form of ATP
please help this is due today
Answer:
A
Explanation:
I took that test
Answer:
D
Explanation:
Through the process of cellular respiration, Energy in food is converted into energy that can be used by the body.
During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, energy is transferred to ATP
When is it clear that a balanced force are acting on an object?
I NEED HELP ASAP PLEASE!
Question 6 of 10
What is the slope of the line plotted below?
O A. 1
O B. -0.5
O C. 0.5
O D. 2
The planet Mars is located 228 million kilometers (2.28 x 1011 m) away from the sun. If it takes the sun light 760 seconds does light take to reach Mars from the Sun, how fast is the light travelling?
Answer: hey
Explanation:
What effect does inertia have on the motion of an object?
Answer:
Inertia is the tendency of an object to resist a change in its motion. Because of inertia, a resting object will remain at rest, and a moving object will keep moving. Objects with greater mass have greater inertia
7) Which statement below best describes the motion of the cart under the conditions shown in the image below?
The battery is made up of three 1.5 V cells.
Calculate the total potential difference of the battery.
Answer: 4.5 V
Explanation:
Given
The voltage of each cell is 1.5 V
If they are connected end to end their potential added to give a higher potential i.e. 1.5+1.5+1.5=4.5 V
Which best describes how energy transferred from an electron in the solar wind compares with energy absorbed by an electron in the oxygen atom?
equal to
less than
No energy is transferred.
greater than
Answer:
equal to
(sorry if this is late)
Explanation:
Rest of the answers.
As solar wind approaches Earth, what happens to the charged electrons?
They are deflected as Earth’s magnetic field exerts force on them.
Which best describes how energy transferred from an electron in the solar wind compares with energy absorbed by an electron in the oxygen atom?
equal to
Which statement is accurate about how the aurora borealis is formed?
When the electrons fall to a lower energy state, they release energy as electromagnetic radiation, light.
How does the energy in the light of the aurora borealis compare to the energy as an excited electron returns to its original energy level?
equal to
During the formation of the aurora borealis, the electrons in an atom experience a change in energy levels. Which statement about this change is accurate?
First, the electron absorbs energy to move to a higher energy level.
The energy transferred from an electron in the solar wind is equals to energy absorbed by an electron in the oxygen atom.
What is energy transformation?Energy transformation is the process of changing energy from one form to another form.
Energy transferred from an electron in the solar wind-The solar wind is a hot and paced flow of magnetized gas that streams away from the sun's atmosphere.Energy absorbed by an electron in the oxygen atom-A part of energy is the spent for the kinetic energy with which the electron is moving.It is known that the energy transferred from an electron in the solar wind is equals to energy absorbed by an electron in the oxygen atom.
Hence the energy transferred from an electron in the solar wind is equals to energy absorbed by an electron in the oxygen atom.
Learn more about the transformation of energy here:
https://brainly.com/question/17448762
4 properties of light
An object with a mass of 30 kg moves at a rate of 15 m/S over distance of 10 m. 900 joules of work was done in 10 seconds. What was the power generated by this project?
Answer:
P = 90 W
Explanation:
Mass of an object, m = 30 kg
Speed of the object, v = 15 m/s
Distance, d = 10 m
Work done, W = 900 J
Time, t = 10 s
We need to find the power generated by this project. We know that power is equal to work done divided by time taken.
So,
[tex]P=\dfrac{W}{t}\\\\P=\dfrac{900\ J}{10\ s}\\\\P=90\ W[/tex]
So, the required power generated is 90 W.
Which of the following situations describes a non-contact force acting on an object?
I think its "a dropped penny sinks at the bottom of a pond". Because, non-contact force is a force that you don't touch, like gravity or weight, that falls but you didn't drop it on purpose nature did or gravity itself did.
A toy car is allowed to travel down a ramp. The car travels 1.8 m is 4
seconds. What is the speed of the car?*
Answer:
0.45m/s
Explanation:
Given parameters:
Distance = 1.8m
Time = 4s
Unknown:
Speed of the car = ?
Solution:
The speed of a body is the distance divided by the time.
Speed = [tex]\frac{distance}{time}[/tex]
So;
Speed = [tex]\frac{1.8}{4}[/tex] = 0.45m/s
Which of these nebulae is the odd one out?
Answer:
Answer is on the pic
Explanation:
I hope it's helpful!
Answer:
nebula
Explanation:
The center of mass of a cow and the center of mass of a tractor are 208 meters apart. The magnitude of the gravitational force of attraction between these two objects is calculated to be 1.8 × 10-9 newtons.
What would the magnitude of the gravitational force of attraction be between these two objects if they were 416 meters apart?
A.
1.62 × 10-9 newtons
B.
3.6 × 10-10 newtons
C.
9 × 10-10 newtons
D.
4.5 × 10-10 newtons
Answer:
Choice: D.
Explanation:
Newton’s Law of Universal Gravitation
It states that objects attract each other with a force that is proportional to their masses and inversely proportional to the square of the distance between them. The formula is:
[tex]\displaystyle F=G{\frac {m_{1}m_{2}}{r^{2}}}[/tex]
Where:
m1 = mass of object 1
m2 = mass of object 2
r = distance between the objects' center of masses
G = gravitational constant: [tex]6.67\cdot 10^{-11}~Nw*m^2/Kg^2[/tex]
The center of mass of a cow is at a distance of r=208 m from the center of the mass of a tractor. The gravitational force of attraction is [tex]F=1.8\cdot 10^{-9}\ N[/tex]. It's required to find the new force of attraction F' if the distance was r'=416 m.
It can be noted that r'=2r. If the distance is doubled, the new force is:
[tex]\displaystyle F'=G{\frac {m_{1}m_{2}}{(2r)^{2}}}[/tex]
[tex]\displaystyle F'=\frac{1}{4}G{\frac {m_{1}m_{2}}{r^{2}}}[/tex]
Substituting the original value of F:
[tex]\displaystyle F'=\frac{1}{4}\cdot 1.8\cdot 10^{-9}\ N[/tex]
Operating:
[tex]\displaystyle F'=4.5\cdot 10^{-10}\ N[/tex]
Choice: D.
the magnification produced by a plane mirror is +1. what does this mean?
Answer:
The magnification produced by a plane mirror is +1
means then the size of the image is equal to the size of the object. If m has a magnitude greater than 1 the image is larger than the object, and an m with a magnitude less than 1 means the image is smaller than the object.
A ball with a mass of 0.7 kg is thrown straight upward, flies up to its maximum height, and
then falls back down. If the ball was initially thrown with a kinetic energy of 250.1 joules,
how much potential energy will the ball have at its maximum height? Round your answer to
the tenths place.
Answer:
250.05 J
Explanation:
From the question given above and, the following data were obtained:
Mass (m) = 0.7 kg
Kinetic energy (KE) = 250.1 J
Potential energy (PE) =?
Next, we shall determine the velocity of the ball. This can be obtained as follow:
Mass (m) = 0.7 kg
Kinetic energy (KE) = 250.1 J
Velocity (v) =?
KE = ½mv²
250.1 = ½ × 0.7 × v²
250.1 = 0.35 × v²
Divide both side by 0.35
v² = 250.1 / 0.35
Take the square root of both side
v = √(250.1 / 0.35)
v = 26.73 m/s
Next, we shall determine the maximum height reached by the ball. This can be obtained as follow:
Initial velocity (u) = 26.73 m/s
Final velocity (v) = 0 m/s (at maximum height)
Acceleration due to gravity (g) = 9.8 m/s²
Maximum height (h) =.?
v² = u² – 2gh (since the ball is going against gravity)
0² = 26.73² – (2 × 9.8 × h)
0 = 714.4929 – 19.6h
Collect like terms:
0 – 714.4929 = – 19.6h
– 714.4929 = – 19.6h
Divide both side by –19.6
h = –714.4929 / –19.6
h = 36.45 m
Finally, we shall determine the potential energy of the ball at the maximum height. This can be obtained as follow:
Mass (m) = 0.7 kg
Acceleration due to gravity (g) = 9.8 m/s²
Maximum height (h) = 36.45 m
Potential energy (PE) =?
PE = mgh
PE = 0.7 × 9.8 × 36.45
PE = 250.05 J
Thus, the potential energy at the maximum height is 250.05 J.
Please do #24
24. What is the benefit the Hubble’s ability to detect infrared radiation?
Answer:
i think its D Or maybe C not sure rly
The question is in the photo
What is the magnitude of the centripetal
force that must be applied in order for a
0.5 kg ball on a 2.0 m string to spin with
uniform circular motion at 5.0 m/s?
Answer:
Explanation:
6.25
The magnitude of the centripetal force that must be applied is 6.25 N.
The given parameters;
mass of the object, m = 0.5 kgvelocity of the object, v = 5 m/sradius of the string, r = 2 mThe magnitude of the centripetal force that must be applied is determined by the product of the mass of the object and the centripetal acceleration.
The centripetal force is calculated as follows;
[tex]F_c = ma_c = \frac{mv^2}{r} \\\\F_c = \frac{0.5 \times 5^2}{2} \\\\F_c = 6.25 \ N[/tex]
Thus, the magnitude of the centripetal force that must be applied is 6.25 N.
Learn more here: https://brainly.com/question/14905888
Does a Magnesium atom gains 2 electrons in an ionic compound?
Answer:
Yes
Explanation:
Example of ionic bonding takes place between magnesium(mg) and oxygen(02) to form magnesium oxide (mg0).... Magnesium loses two electrons to form Mg2+, and oxygen gains two electrons to form 02-
