A sled with no initial velocity accelerates at a rate of 3.2 m/s^2 down a hill. How long does it take the sled
to go 12 m to the bottom?
The table shows experimental data of the magnitude of four forces exerted on a 2kg object as it slides across a horizontal surface. Which of the following could represent the magnitude of the net force that is exerted on the object? Select two answers.
Answer:
6N and 10N
Explanation:
The forces acting along the horizontal axis arw the horizontal force applied and the frictional force.
Frictional force is a force that opposes the horizontal force (moving force)
First we need to get the sum of force along the horizontal as shown
\sum Fx = Horizontal force - frictional force
\sum Fx = 8N - 2N
\sum Fx = 6N
Hence one of the magnitude of the net force exerted on the object is 6N
For the forces along the vertical component;
The forces are the weight, force of gravity(acting downward) and the normal force acting upward
Given
Weight = mass × acceleration die to gravity
Weight = 2×10 = 20N
Normal force = 10N
\sum Fy = (weight)-normal force
\sum Fy = (20)-10
\sum Fy = 20-10 = 10N
Hence the other net force acting on the object is 10N
The required options are 6N and 10N
what is the difference between work and power. will mark brainliest
Answer:
Work is defined as the process of energy transfer to the motion of an object through the application of force. This is usually represented as the product of force and displacement. The SI unit of work is Joule.
Explanation:
Power is defined as the amount of energy transferred in unit time. The SI unit of power is the watt. One watt is equal to one joule per second. Power is a scalar quantity.
I believe
Work is the method of the conversion of energy by the application of force to the motion of an object. Power is the unit-time sum of energy transmitted.
Calculate the speed of a bus that travels a distance of 55 miles in 0.75 hours.
While riding in a hot air balloon, which is steadily descending at a speed of 2.44 m/s, you accidentally drop your cell phone.
(a) After 4.00 s, what is the speed of the cell phone?
V = 41.64
m/s
(b) How far is the cell phone below the balloon after this time?
Answer:
Explanation:
Ff
1. How is the attractive electrostatic force between a proton and an electron indicated in Coulomb's law?
the sum of the charges indicates a positive force
the product of the charges indicates a positive force
the product of the charges indicates a negative force
the sum of the charges indicates a negative force
2. One particle has a negative charge, while another particle is neutral. Which statement describes the electrostatic force between these two particles?
There would be no electrostatic force because the sum of the two charges is 0.
The electrostatic force is attractive due to the particle with negative charge.
There would be no electrostatic force because the product of the two charges is 0.
The electrostatic force is repulsive due to the particle with negative charge.
3. How would the electrostatic force change if Coulomb's law included a negative sign?
Like charges would repel, and opposite charges would attract.
It would not make a difference in the electrostatic force.
It would depend on the magnitude of the charges.
Like charges would attract, and opposite charges would repel.
What is the value and the direction of an electric field at a distance of 2.5 m from a +1 nC charge?
approximately 145 V/m directed away from the positive charge
approximately 145 V/m directed toward the positive charge
approximately 1.45 V/m directed away from the positive charge
approximately 1.45 V/m directed toward the positive charge
Answer:
The product of the charges indicates a negative force
There would be no electrostatic force because the product of the two charges wld be zero
Like chargers wld attract, and opposite charges wld repel
Approximately 1.45 V/m directed away from the positive charge
Explanation:
According to Coulomb's law the electrostatic force is directly proportional to the product of the charges and inversely proportional to the distance separating them.
According to Coulomb's law;
F =[tex]Kq1q2/r^2\\[/tex]
Where;
K = constant of Coulomb's law
q1 and q2 are the respective magnitudes of the charges
r = distance separating the charges
Hence,according to Coulomb's law, the product of the charges indicates a negative force.
According to Coulomb's law, for a negative charge, and a neutral particle, there would be no electrostatic force because the product of the two charges is 0. If Coulomb's law included a negative sign then Like charges would attract, and opposite charges would repel.
The electric field is given by the formula;
[tex]E = kq/r^2\\k= 9 * 10^9 Nm^2C-2\\q =1 * 10^-9 C\\r = 2.5 m\\E = 9 * 10^9 Nm^2C-2 * 1 * 10^-9 C/( 2.5 m)^2\\E = 1.45 V/m[/tex]
The direction of the electric field is 1.45 V/m directed away from the positive charge.
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What are some examples of an element? How do you know they are an element?
HELP PLZ ITS DUE SOON
A photo frame with a mass of 2.8 kg is hung from a nail according to the opposite figure. If we know that the nail is located exactly in the middle of the string and the frame does not touch the wall, how many newton is the tensile strength of the string?
Answer:
One string (side of) must support 1.4 kg.
T cos 15 = vertical force required by each side of the string
T cos15 = 1.4 * 9.8 N
T = 1.4 * 9.8 / cos 15 = 14.2 N
How do you find the range of a data set?
A. Subtract the smallest value from the largest value
B. Add the largest value to the smallest value
C. Add all the data values together
D. Subtract the smallest value from the average value
SUBMIT
The answer is A.
The answer is A.
The answer is A.
Identify two changes in your world that might occur if funding for scientific research were cut drastically
Answer:
Little to no scientific advancement
More wide spread diseases
Explanation:
When you must add three vectors together, what is not true this process? You must only give a magnitude of the resultant vector It does not matter what order you add the vectors You can move the vectors parallel to each other You must connect the head of each vector with the tail of the next vector
The addition of any numbers of vector provide the magnitude as well as the direction of the resultant vector, hence the mentioned first option is not true.
The addition of vector required to connect the head of the one vector with the tail of the other vector and any vector can be moved in the plane parallet to the previous location, so, the mentioned second and third options are true.
Explain why the nucleus is very dense BRAINLIEST
Lauren throws her first pitch of the season for her school's softball team. If the ball travels 80 feet and takes 1.58 seconds to travel this distance, what is the speed of the ball? Round you answer to the nearest hundredth.
Answer:
50.63 ft/s (2dp)
Explanation:
Speed = Distance/Time
80/1.58 = 50.63291139
= 50.63 ft/s (2dp)
What does the blood pick up?
Oxygen
hope this helps:)
Answer:
Explanation:
the cells need oxygen for metabolism, which also creates carbon dioxide as a waste product. The red blood cells then pick up the carbon dioxide and transport it back to the lung. There we exhale it when we breathe out. Red blood cells can also pick up or release hydrogen and nitrogen.
In what direction must he walk in order to return to his original position?
30 degrees N of W
40 degrees N of W
40 degrees NW
50 degrees N of W
A rectangular field has one side fence 500m land and another side fond zoom
Answer:
40 dedrees south
Answer:
40 degrees south
Explanation:
On Earth, a table has a mass of 97 kg. What is its weight?
Answer:
w=mg
Explanation:
w=97×9.8
w=950.6 N
y’all I would rlly appreciate if y’all gave me the answers to all my questions. My cousin has over 200 assignments she hasn’t done so I’m trying to help her and tbh I don’t know this stuff bc I’ve never done it in school.
Answer:
BB×bb cross is the answer
If an object starts from rest, what is its initial velocity?
Answer:
if an object starts from rest it's initial velocity is zero
pleasee helpppppp !!
Answer:
I think... i think it's position 3
Explanation:
Write a paragraph describing the series of events that occur in the operation of a complex machine that you have used recently and Identify the simple machines that make up parts of the complex machine.
A student ties a ball at the end of a string and whirls the string at a constant speed. If the radius of the circle along which the ball moves is 1.2 m and the acceleration is 7.5 m/s2what is the speed of the ball?
a = v ² / R
where a is acceleration, v is speed, and R is the radius. So
7.5 m/s² = v ² / (1.2 m)
v ² = (7.5 m/s²) / (1.2 m)
v ≈ 6.8 m/s
Scientific research involves ____ observations that are also repeatable.
A. Interpreting B. Verifying C. Asking
please answer soon
A projectile is launched at an angle above the ground. (upwards). The vertical
component of the projectile's velocity is initially 30 m/s. What is the vertical velocity
after 2.0 seconds of flight?
How many different relationships do the great white sharks have? (Science)
Answer:
three symbiotic relationships
The great white shark has each of the three symbiotic relationships. It has a commensalistic relationship with the remora because the remora cleans the shark's body and the shark is unaffected. It has a Parasitic relationship with the germ ommatokoita elongata because the germ is benifited and the shark is harmed.
plz mark brainliest
A climber of mass m slides down a vertical rope with an average acceleration a. What is the average frictional force exerted by the rope on the climber?
Answer:
m(g - a)
Explanation:
Since he slides with a mass 'm' and acceleration of "a", it means he is sliding in the position of gravity. Thus, Force = ma
Now, the force due to gravity = mg
The overall acceleration of the climber is downward along the rope. So "ma" is negative. Now, the only external forces acting on the person will be the force of gravity acting downward (W = mg) and the supporting Frictional Force F_f.
Thus, the net average frictional force of exerted by the rope on the climber will be;
mg - F_f - ma = 0
F_f = mg - ma
F_f = m(g - a)
A car is driving down the highway at a 50 m/s. Suddenly, the driver sees an accident and slams on his breaks, coming to a complete stop in 10 seconds. How far did the car travel before coming to a stop?
Given parameters:
Speed of the car = 50m/s
Time = 10s
Unknown:
Distance traveled before the car stopped = ?
We need to establish speed - time - distance relationship.
Speed is the rate of change of distance with time. It is a scalar quantity .
Mathematically;
Speed = [tex]\frac{distance}{time}[/tex]
Distance = speed x time
Input the parameters and solve;
Distance = 50 x 10 = 500m
The car traveled 500m before it stopped.
What happens to the acceleration of a car that travels down a ramp and eventually stops?
Answer:The speed stops because the car loses energy and fuel.
Explanation:
Change in speed = 14 m/s, time taken = 2 seconds. Calculate the acceleration.
In a complete description of a force vector, which is usually not necessary?
O A. magnitude
O B. direction
OC. type
O D. units
In the complete description of a force vector, type is usually not necessary. Thus, the correct option is C.
What is Force vector?A force vector is a representation which has both the magnitude and direction of the force. Such a vector is typically represented through an arrow in the direction of the force applied and with a length which is proportional to the magnitude of the force.
If a force is applied on an object, this causes movement of the object in a given direction and the wind applies a force on it at an angle, and the new motion will be as that of a force which was applied in that direction.
Therefore, the correct option is C.
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A plane starts out at rest. 100 seconds later, its velocity is 300 m/s. What
vas its average acceleration during this time?
Answer:
3 m/s^2
Explanation:
avg. acceleration= (change velocity)/ time
[v(final)-v(initial)]/(t2-t1)
[(300 m/s)-(0 m/s)]/(100s-0)
(300 m/s)/(100s)
= 3 m/s^2