Answer:
1.7 m/s.
Explanation:
We'll begin by calculating the current speed of the student. This can be obtained as follow:
Distance = 250 m
Time = 30 s
Speed =?
Speed = distance /time
Speed = 250 / 30
Speed = 8.3 m/s
Thus, her current speed is 8.3 m/s
Next, we shall determine the speed of the student the next day. This can be obtained as follow:
Distance = 300 m
Time = 30 s
Speed =?
Speed = distance /time
Speed = 300 / 30
Speed = 10 m/s
Thus, her speed the next day is 10 m/s
Finally, we shall determine the increase in the speed of the student. This can be obtained as follow:
Current speed = 8.3 m/s
Next day speed = 10 m/s
Increase in speed =?
Increase in speed = (Next day speed) – (Current speed)
Increase in speed = 10 – 8.3
Increase in speed = 1.7 m/s
Thus, the increase in the speed of the student is 1.7 m/s
Question 5 of 10
A sodium atom loses an electron. What is the resulting particle?
A. An ion with a positive charge
B. An isotope with a negative charge
C. An isotope with no charge
D. An ion with a negative charge
Answer:
A. an ion with a positive charge
Answer:
A) An ion with a positive charge
MORE TO KNOW Sodium atom loses one electron and become CationIons is the atom or molecule having a charge on them Cation is positively charged ions Anion is negatiely charged ionsElements loses electrons to become Cation When they gain electrons they become anion Examples - Na+ , Mg + , Cl- Elements looses or gain electrons to complete its octet.A sound wave traveling in water 144m/s has a wavelength of 0.5m determine the frequency of the wave
Heya!!
For calculate frequency, lets applicate formula:
[tex]\boxed{f=v/\lambda}[/tex]
Δ Being Δ
f = Frequency = ?
v = Velocity = 144 m/s
[tex]\lambda[/tex] = Wavelenght = 0,5 m
⇒ Let's replace according the formula:
[tex]\boxed{f = 144\ m/s / 0,5\ m }[/tex]
⇒ Resolving
[tex]\boxed{f = 288\ Hz}[/tex]
Result:
The frequency of that wave is 288 Hertz
Good Luck!!
Answer:
K Shut up bro
Explanation:
Pls help me
A cat is chasing a rat and moving at 0.8m per 2 seconds. Continuing at the same rate, the cat will have moved __ m in 3 seconds.
The distance should be 0.12m
Calculation of the distance:
Since A cat is chasing a rat and moving at 0.8m per 2 seconds.
And, the time taken should be 3 seconds
So, here the distance should be
= 0.8/2 * 3
= 0.4*3
= 0.12m
Hence, we can conclude that The distance should be 0.12m
learn more about rate here: https://brainly.com/question/11464983
which of the following does not dissolve in water
Answer:
Sand,Mud
Explanation:
Sugar and salt are examples of soluble substances. Substances that do not dissolve in water are called insoluble. Sand and flour are examples of insoluble substances.
think of a famous person and gather information about him/her
Abraham Lincoln
Explanation:
hope it helps you a little
When looking at liquids in a container, that have layered on one another;
the most dense liquid will be
a. at the top
b. in the middle
c. at the bottom
Answer: C. At the bottom
Plzz helpp!!!!!!!!!!!!!!!
Answer:
the answer ischarge of +3
Pls help I give brainLy and a thanks and points
The speedometer shows the cart’s speed, or how fast it moves. A speed of 30 cm per second means the cart moves 30 cm every second. What was the final speed of the cart?
The Final speed of the cart = ( Δ Distance ) / time travelled
Although your question lacks some missing data a general answer is provided within the scope of your question .
Given that:
Speed = Distance / time
Initial speed of the cart = 30 cm/sec
The Final speed of the cart ( V ) = Δ Distance / time
Hence we can conclude that the final speed of the cart will be ( Δ Distance ) / time travelled.
Learn more : https://brainly.com/question/6108244
What are the two factors of energy?
how much mass or speed will the object have
a chair is several feet from a fireplace. The side facing the fireplace is warmer due to:
a. Conduction b. Convection c. radiation
c.
Explanation:!(*´∇`)ﾉ
A 75.0 kg person rides up and down in an elevator that starts from rest, accelerates from rest to 2.0m/s in 2.0s, continues at a constant velocity of 2.0m/s for 2.0s, and then comes to a stop from 2.0m/s in 2.0s. Calculate what the scale would read in each of the following situations. Show all work including free-body diagrams. Round off g to 10 m/s2.
In your response, include the following key termsı mechanical energy, electrical energy, generator, electromagnetic induction, magnetic field, and electromotive force. (5 Points)
The speed of sound is 331 m/s:
in a vacuum
in air, water, or any other medium
in air at 0°C
in air at any temperature
Answer:
331 m/s in air at 0 degC.
Explanation:
Cooler the air slower the speed of sound.
Normal air temp: 20 C/68 degF is 343m/s
0 m/s in a vacuum/outer space
faster yet in water
4. During a road test, a driver brakes a 1420 kg car moving at 64.8 km/h [W]. The car
slows down and comes to a stop after moving 729 m [W].
(a) Calculate the net force acting on the car. (ans: 316 N [E]
(b) What is the force of friction acting on the car while it is slowing down? Explain
your reasoning. [ans: 316 N [E]]
Answer:
a. -312.4 N or 312.4 N [E] b. -312.4 N or 312.4 N [E]
Explanation:
a. Using v² = u² + 2as where u = initial velocity of car = 64.8 km/h = 64.8 × 1000 m/3600 s = 18 m/s, v = final velocity of car = 0 m/s since the car stops, a = deceleration of car and s = distance car moved = 729 m.
So, making the acceleration subject of the formula, we have
a = (v² - u²)/2s
substituting the values of the variables, we have
a = ((0 m/s)² - (18 m/s)²)/(2 × 729 m)
= - (18 m²/s²)/(2 × 729 m)
= -324 m²/s² ÷ 1458 m
= -0.22 m/s²
So, the net force , F acting on the car is F = ma where m = mass of car = 1420 kg and a = deceleration = -0.22 m/s².
So, F = ma = 1420 kg × -0.22 m/s² = 312.4 N or 312.4 N [E]
b. Since no forward force acts on the car while it is slowing down, the frictional force equals the force acting to stop the car, f = ma which is equal to the net force where m = mass of car = 1420 kg and a = deceleration = -0.22 m/s²
So, f = ma = 1420 kg × -0.22 m/s² = -312.4 N or 312.4 N [E]
a) The net force acting on the car will be 312.4 N [E]
(b) The force of friction acting on the car will be 312 N [E].
What is the friction force?It is a type of opposition force acting on the surface of the body that tries to oppose the motion of the body. its unit is Newton (N).
Mathematically it is defined as the product of the coefficient of friction and normal reaction.
The given data in the problem is;
m is the mass of car=1420 kg
u is the initial speed 64.8 km/h = 4.8 × 1000 m/3600 s = 18 m/s
v is the final speed =0 m/sec
s is the distance travelled before stop= 729 m
a is the deceleration = -0.22 m/s².
a) The net force acting on the car will be 312.4 N [E]
The value of net force is found with the help of Newtons third equation of motion;
[tex]\rm v^2=u^2+2as\\\\ \rm a= \frac{v^2-u^2}{2s} \\\\ \rm a= \frac{(0)^2-(18)^2}{2\times 729} \\\\ \rm a= 0.22 \ m/s^2[/tex]
So the net force will be;
[tex]\rm F = ma \\\\\ \rm F = 1420 \times 0.22 ² \\\\ \rm F =312.4\ N [E][/tex]
Hence the net force acting on the car will be 312.4 N [E]
(b) The force of friction acting on the car will be 316 N [E].
The frictional force equals the force working to stop the automobile,
f = ma,
Which is equal to the net force,
The force of friction will be
[tex]\rm F_f= m \times a \\\\\ \rm F_f= 1420\times -0.22 \\\\ \rm F_f= -312.4 N [E][/tex]
Hence the force of friction acting on the car will be 312 N [E].
To learn more about the friction force refer to the link;
https://brainly.com/question/1714663
A person of weight mg, is standing on a scale in an elevator. What will the
scale read when the elevator is moving downward at a constant velocity?
A. more than mg
B. less than mg
C. equal to mg
Answer:
B. less than mg
Explanation:
A person's weight changes as he rides an elevator at a constant velocity. If the elevator is moving downward, the person's weight becomes lesser. He is considered to be in "free fall" due to gravity. However, the opposite happens when the elevator goes upward. The person will feel heavier because he is going against gravity. This means his weight is more than his actual weight. If the person will stand on an elevator that doesn't move, his weight will just be the same. All of these is due to Newton's Second Law of Motion where an object's acceleration relies on its force and mass.
Temperature represents the average potential energy of molecules
within a substance.
True or False
Answer:false
Explanation:
i need to submit my homework in an hour, this is only question i cant solve. someone pls help!!
Hope this helps.......☺
A bowling ball is traveling with a velocity of 12m/s. Its momentum is 114 kgm/s. What is the mass of the bowling ball. Include the correct units in your answer.
Answer:
9.5 kgExplanation:
The mass of the bowling ball can be found by using the formula
[tex]m = \frac{p}{v} \\ [/tex]
p is the momentum
v is the velocity
From the question we have
[tex]m = \frac{114}{12} = \frac{19}{2} = 9.5 \\ [/tex]
We have the final answer as
9.5 kgHope this helps you
Washington State is one of the northernmost states in the continental U.S., but still has relatively mild winters. This is because it -- D.-receives more solar energy A.-has mountain ranges B.-is located near the ocean C.-is a heavily populated state
Answer:
B.-is located near the ocean
Explanation:
Washington State is the northwest state in the continent of United State. Officially, this state is known as the State of Washington, named after the the 1st president of the United States, George Washington. It is one of the most socially liberal state of the USA.
The climate of the Washington state is much diverse due to the influence of the marine air and the mountain ranges in the state. The climate varies from east to west. It has mild winters as it is located near the Pacific ocean.
to be truthful i'm really tired right now and do not feel like searching for this answer so!
Answer:
According to Newton's 2nd law, if the net force applied on an (moving) object increases then the acceleration proportionately increases, according to force equals the mass multiplied by the acceleration, (Force = Mass × Acceleration). Mass is held constant
Explanation:
Newton's second law states that the acceleration, a, at which an object moves is directly proportional to the net force, F, applied on the object and is inversely proportional to the mass, m, of the object
Mathematically, we have;
a ∝ F, and a ∝ 1/m
Therefore;
According to Newton's 2nd law, if the net force applied on an (moving) object increases then the acceleration proportionately increases, according to force equals the mass multiplied by the acceleration, (Force = Mass × Acceleration). Mass is held constant
A stone tied to a string is made to revolve in a
horizontal circle of radius 4 m with an angular
speed of 2 radians per second. With what
tangential velocity will the stone move off the
circle if the string cuts?
Answer:
The tangential velocity is 8 m/s
Explanation:
Uniform Circular Motion
It can be described as the motion of an object in a circle at a constant speed.
As an object moves in a circle, it continually changes its direction.
If the radius of the circle is r and the angular speed is w, then the tangential velocity is:
v = w.r
The stone is revolving in a circle of radius r=4 m with an angular speed of w=2 rad/s. The tangential velocity is:
v = 2 rad/s * 4 m
v = 8 m/s
Which of the following best describes the circuit shown below?
A) series
B)open
C)parallel
D)short
Answer:it is b i just did this
Explanation:
Answer: i think its b hope this helped :)
Explanation:
A 1000 kg whale is dropped at a rate of 9.8 m/s2. With what force will it hit the ground?
Answer:
If your teacher doesn't ask u to turn kg into lb:
F = m × a
F = 1000kg × 9,8m/s2
F = 9800N
If she does ask u then:
m= 1000kg × 2,206 = 2204.62lb
use the same formula
The force with which the whale will hit the ground is 9800 Newtons.
Given the data in the question:
Mass of whale; [tex]m = 1000kg[/tex]Acceleration at which the whale was dropped; [tex]a = 9.8m/s^2[/tex]Force; [tex]F = \ ?[/tex]
To determine the force with which the whale will hit the ground, we use Newton's second law of Motion;
[tex]F = m * a[/tex]
We substitute our values into the equation
[tex]F = 1000kg * 9.8m/s^2\\\\F = 9800kgm/s^2\\\\F = 9800N[/tex]
Therefore, the force with which the whale will hit the ground is 9800 Newtons.
Learn more about Newton's law of motion: brainly.com/question/20066791
What is the potential energy of the 450 kg glass on the 18 m high desk?
Answer: 12 J
Explanation: because of the potential energy
plz answer it......
.
plz
Answer:
Definitely C
Hope it helped!
(And I hope it's not wrong...lol)
What voltage would produce a current of 100amps through an aluminum wire assuming that the re sistance of the wire is3.44×10-4 ohm
Does an object with constant speed also have constant velocity?
How can the motion of an object be changed?
An arcade ball is thrown with an initial speed of 7.0 m/s and follows the trajectory shown. The ball enter the basket .95 seconds after it is launched. What are the distances x and y?
Complete Question
The diagram for this question is shown on the first uploaded image
Answer:
[tex]x = 4.70 \ m[/tex] , [tex]y = 0.2803 \ m[/tex]
Explanation:
From the question we are told that
The initial velocity of the arcade ball is [tex]u = 7.0 \ m/s[/tex]
The time taken by the ball to enter the basket is [tex]t = 0.95 \ s[/tex]
Generally the x -component of the initial velocity is
[tex]u_x = 7 * cos (45)[/tex]
=> [tex]u_x = 4.95 \ m/s[/tex]
Generally the y -component of the initial velocity is
[tex]u_x = 7 * sin(45)[/tex]
=> [tex]u_y = 4.95 \ m/s[/tex]
Generally the distance x is mathematically represented as
[tex]x = u_x * t[/tex]
=> [tex]x = 4.95 * 0.95[/tex]
=> [tex]x = 4.70 \ m[/tex]
Generally from kinematic equation the distance y is mathematically represented as
[tex]y = u_y * t - \frac{1}{2} * g * t^2[/tex]
=> [tex]y = 4.95 * 0.95 - \frac{1}{2} * 9.8 * 0.95^2[/tex]
=> [tex]y = 0.2803 \ m[/tex]
