A tennis ball is thrown straight up into the air with an initial velocity of 38 m/s.
a. How long does it take to reach its highest point?
b. How high does the ball travel?
Answer:
a) 3.9s
b)74m
Explanation:
a) v=u+at
0=38+(-9.8)t
-38=-9.8t
t=-38/-9.8
t=3.877s
t=3.9s
b) s=ut+1/2at²
s=(38×3.9)+1/2(-9.8×3.9²)
s=148.2 -74.529
s=73.671
s=74m
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:
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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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?
PLEASSSE HURRY!!
The sum of all of the chemical reactions occurring in a cell is called
A) photosynthesis
B) diffusion
C) oxidative respiration
D) metabolism
Answer:
d
Explanation:
i am smart
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 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
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
As shown in the figure below, Jenna rushes 30 m toward her truck. She notices she forgot her jacket and
returns back to the house. Her total travel time is 75 s.
30 m
30 m
What is Jenna's average velocity over the 75 s period?
What is Jenna's average speed over the 75 s period?
Answer:
Average Velocity: 0
Average Speed 0.8
Explanation:
Velocity - (30-30)/75 = 0
Speed - (30+30)/75 = 0.8
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:
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.
Give 5 examples of physical properties that could be used to describe a solid
Change in speed = 14 m/s, time taken = 2 seconds. Calculate the acceleration.
If an object starts from rest, what is its initial velocity?
Answer:
if an object starts from rest it's initial velocity is zero
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 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.
Calculate the speed of a bus that travels a distance of 55 miles in 0.75 hours.
Why Carbonated drinks are homogeneous mixture
Answer: Explanation:
Carbonated drinks are mixtures of water, sugar, flavorings, and dissolved carbon dioxide gas. They are homogeneous because the ingredients are mixed together to form a consistent liquid.
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:
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
pleasee helpppppp !!
Answer:
I think... i think it's position 3
Explanation:
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.
carbon show some unique property name them name them
Answer:
Physical Properties of Carbon:
Carbon is a unique element. It occurs in many forms. Some examples of the pure form of carbon are coal and soot.
It is soft and dull grey or black in colour.
One of the most important compounds of carbon is the charcoal, which is formed when carbon is heated in the absence in of air.
It occurs in a number of allotropic forms. Allotropes are nothing but forms of an element with varying physical as well as chemical properties.
The density of the different forms of carbon depends upon the origin of these elements. You will find some forms of carbon which are pure and some forms which are not pure like coal which is the mixture of both carbon and hydrogen.
Chemical Properties of Carbon
Carbon compounds generally show 4 reactions, they are
Combustion reaction
Oxidation reaction,
Addition reactions
Substitution reaction.
As we all know that carbon in all forms needs oxygen, heat, and light and forms carbon dioxide. When it is burned in air to give carbon dioxide, it is called as combustion.
Let us get the concept of this using some examples when it is burnt in the air: When methane CH4 is burnt in the presence of oxygen it gives us carbon dioxide, heat, and light.
Explanation:
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
What are some examples of an element? How do you know they are an element?
HELP PLZ ITS DUE SOON
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
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)
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.
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What is the momentum of an object with a mass of 60 kg and velocity of 10 m/s?
heeelp
Answer:
Linear momentum= Mass*Velocity
P=mv
P=60*10
P=600Kg m/s
Three pucks A, B, and C are shown sliding across ice at the noted speeds. Air and ice friction forces
are negligible (they are assumed to not exist) Rank the forces needed to keep them moving
greatest to least. You must justify your answer
A=2 m/s
B= 4 m/s
C=6 m/s
The puck that required the greatest force to be stopped is puck C, followed by puck B and the least is puck A.
Applied force
The force needed to stop the pucks or applied to stop the pucks is determined by applying Newton's second law of motion as shown below;
F = ma
F = mv/t
where;
F is the applied forcem is the mass of the pucksv is the speed of the puckst is the timeFrom the quation above, the applied force is directly proportional to the speed of the pucks. Thus, the greater the speed of the puck, the greater the required force to stop the puck.
Therefore, the puck that required the greatest force to be stopped is puck C, followed by puck B and the least is puck A.
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