A racing car is travelling at 70 m/s and accelerates at -14 m/s^2. What would the car’s speed be after 3 s?
Statement:A racing car is travelling at 70 m/s and accelerates at -14 m/s^2.
Solution:Initial velocity (u) = 70 m/sAcceleration (a) = -14 m/s^2Time (t) = 3 sLet the velocity of the car after 3 s be v m/sBy using the formula,v = u + at, we have
[tex]v = 70 + ( - 14)(3) \\ = > v = 70 - 42 \\ = > v = 28[/tex]
So, the velocity of the car after 3 s is 28 m/s.Answer:The car's speed after 3 s is 28 m/s.
Hope it helps
4. Mr. S set up an experiment to see how the mass of a
ball affects the distance it rolls off a ramp. Identify the dependent
variable.
a) Distance traveled by the ball
b) Height of the ramp
c) Mass of the ball
Answer:
The correct answer would have to be
C. Mass of the ball
A sports car of mass 1000 kg can accelerate from rest to 27 m/s in 7.0 seconds. What is the average forward force on the car?
Group of answer choices
a.2.6 x 10^2 N
b.3.9 x 10^3 N
c.2.7 x 10^4 N
d.1.9 x 10^5 N
Answer:
Explanation:
F = ma = mΔv/Δt = 1000(27 - 0)/(7.0 - 0) = 3,857.1428...
b. F = 3.9 x 10³ N
C) speed.
11. Which of the following is a scientific statement?
A) candy Bon Bons contain no sugar
B) there are things we will never know about
matter is filled with undetectable particles
D) there are parts of the universe that will never be disco
E) none of the above
Explanation:
Cccccc for sure(⌐■-■)Iam a genius
The scientific statement here is option B , there are things we will never know about matter is filled with undetectable particles. This statement is describing the nature of a matter in a scientific way.
What is a scientific statement ?A scientific statement is a description about any phenomenon or properties of any substance in a scientific way. That may include theoretical predictions, universally accepted things, observations etc.
Most of the scientific statements are stated based on the results of well designed scientific investigations and are communicated through various scientific journals and articles.
Here, the statement that describes the nature of matter and its composition is an example of scientific statement. All of the other statements are not scientific.
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The Supreme Court decision in Brown v. Board of Education, which desegregated schools, is an example of judicial activism.
True
False
How many total atoms are in the following: 3NHe4
A.15
B.3
C.7
D.12
At t=0, a block A of mass 8 kg and block B of mass 16 kg are both at position x=0 . Block A is at rest, and block B is moving at a constant velocity of 10 m/s in the positive x-direction. At t=3 s, the center of mass of the two objects is at the position x=
The center of mass of the two objects is the average position of the parts of the two object system
The center of mass of block A, and block B after displacement of block B is at 20 m from block A
Reason:
The given parameters are;
The position of block A and block B at t = 0 is x = 0
The mass of block A, m₁ = 8 kg
Mass of block B, m₂ = 16 kg
Speed of block A = 0 m/s
Speed of block B, v₂ = 10 m/s
Location of the center of mass of the two object at t = 3 s; Required
Solution;
The location of block A, after 3 s is x₁ = 0 (block A is at rest)
The location of block B, = v₂ × t
The location of block B, after 3 s is x₂ = 10 m/s × 3 s = 30 m
The center of mass of two masses are given as follows;
[tex]x_{cm} = \dfrac{m_1 \cdot x_1 +m_2\cdot x_2}{m_1 + m_2}[/tex]
[tex]x_{cm} = \dfrac{8 \times0 + 16 \times 30}{8 + 16} = 20[/tex]
The center of mass of the two objects is at at the position x = 20 m (from block A)
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Which diagram illustrates that matter is always conserved in a chemical reaction?
Answer:
Only the third option has the same number of each size and color circles on either side of the arrow.
Explanation:
I believe it represents the dissolution of two molecules of hydrogen peroxide into two water molecules and an oxygen gas molecule.
The first one balances oxygen but changes sulfur with either carbon or nitrogen
The second one needs 5 oxygen gas pairs instead of a single one on the left to balance the right side. Represents oxidation of a propane molecule if given enough oxygen.
The fourth one has an extra nitrogen on the left side. The hydrogen is balanced. Making amonia.
Why is an un-magnetised iron object attracted to a magnet?
Answer:
Why is an unmagnetized iron object attracted to a magnet?
Magnets attract iron due to the influence of their magnetic field upon the iron. When exposed to the magnetic field, the atoms begin to align their electrons with the flow of the magnetic field, which makes the iron magnetized as well.
Explanation:
An un-magnetized iron object attracted to a magnet because each atom of iron object behaves like a complete magnate having north and south pole of equal strength.
The electron revolving around the nucleus of iron atom are equivalent to small current loop having magnetic dipole.
What is Magnetization?When a magnetic material is positioned close to a magnet, it induces a density of magnetic dipole moments known as magnetization.
The motion of electrons in atoms, or the spin of the electrons or the nuclei, is what produces a material's magnetic properties; the magnetic effect can also be created by running an electrical current through the material.
When an un-magnetized iron object attracted to a magnet; every iron atoms experiences a magnetic attraction force due to magnetic field of the magnet and the atoms try to aliened themselves in such way that they can experience optimum attraction.
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HELP ME PLZZZ
You attach a cart with a mass of
0.92 kg to a spring and compress the cart-
spring system. The spring constant for the spring is 130 N/m. Your objective is
to propel the cart with a velocity of 1.4 m/s along a frictionless surface. How
need to compress the spring in order to meet your target velocity?
far do
you
Which of the following processes is an important part of star formation? A. nuclear fusion B. nuclear fission C. molecular fusion D. molecular fission
Answer:
B
Explanation:
Answer:
Option A is correct.
Explanation:
At the temperature [tex]10^{7}K[/tex] the hydrogen atoms fuse to form helium thus a large amount of heat is produced and stars are formed.
What causes a star to form?Due to gravitational pull the particles and the molecules of gases become condense and by which it becomes hot. The process goes unless the temperature of the core becomes 10,000,000K.
At this temperature, the fusion takes place and energy is released.
Thus the star shines.
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A can of soda weighs 4.7 newtons (N) on Earth's surface. What will it weigh on Planet X where the acceleration due to gravity is 1.82 meters per second^2?
Explanation:
The mass of the soda can is
[tex]m = \dfrac{W}{g} = \dfrac{4.7\:\text{N}}{9.8\:\text{m/s}^2} = 0.48\:\text{kg}[/tex]
The weight of this same soda can on Planet X is
[tex]W = mg_p = (0.48\:\text{kg})(1.82\:\text{m/s}^2) = 0.87\:\text{N}[/tex]
TDS and ppm are common units used to measure
a) the amount of some item in the water.
b) the temperature of water.
c) the direction of water currents.
d) the flow speed of a river
Answer:
c
Explanation:
pls give brainliest have a great day
TDS and ppm are common units used to measure the quantity of substance in the water, therefore the correct answer is option A.
What is a unit of measurement?A unit of measurement is a specified magnitude of a quantity that is established and used as a standard for measuring other quantities of the same kind. It is determined by convention or regulation.
Common units used to measure the amount of material in water are TDS and part per million.
As given in the problem we have to find out for what measurement, the units TDS (Total dissolved solid )and ppm (parts per million) are used.
The total dissolved solid and parts per million are used to measure the amount of substance present in the water, therefore the correct answer is option A.
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A cyclist rode the first 30-mile portion of his workout at a constant speed. For the 22-mile cooldown portion of his workout, he reduced his speed by 4 miles per hour. Each portion of the workout took the same time. Find the cyclist's speed during the first portion and find his speed during the cooldown portion.
Answer:
The cyclist rode the first 26-mile portion of his workout at a constant speed.
Time = distance/speed
Time taken to ride through the first portion is
26/x
For the 18-mile cool down portion of his workout, he reduced his speed by 4 miles per hour. It meas that his speed during the cool down portion is (x - 4) mph. Time taken to ride through the cool down portion is
18/(x - 4)
Since each portion of the workout took the same time, it means that
26/x = 18/(x - 4)
Cross multiplying, it becomes
26(x - 4) = 18x
26x - 104 = 18x
26x - 18x = 104
8x = 104
x = 104/8
x = 13 mph
His speed during the cool down portion is
13 - 4 = 9 mph
Explanation:
not simple
The depth of a pond is 1.5m. Calculate the pressure caused by the water at the bottom of the pond ??
Answer:
Area=1.5(1.5)=2.25m^2
Force of gravity=10N
\begin{gathered}\\ \sf\longmapsto Pressure=\dfrac{Force}{Area}\end{gathered}
⟼Pressure=
Area
Force
\begin{gathered}\\ \sf\longmapsto Pressure=\dfrac{10}{2.25}\end{gathered}
⟼Pressure=
2.25
10
\begin{gathered}\\ \sf\longmapsto Pressure=4.4Pa\end{gathered}
⟼Pressure=4.4Pa
Explain in terms of refraction and wavelength, why dispersion of white light happens.
Pls help
I will put brainliest
Answer:
terms of refraction and wavelength, why dispersion of white light happens.
Explanation:
hope it helps
Which are characteristics of a solid? (Select all that apply.)
It maintains its volume.
It can be compressed.
It keeps its shape.
It fills the container it is in.
A solid maintains its volume and shape.
I will mark you brainlist please help!
Answer:
C.) The Distance DH = 1.5 lambda
Explanation:
This statement C.) is false, because it does not count as the 1.5 wavelength, it is less than 1 wavelength.
Starting from rest, a ball of mass 2 kg is accelerated at 4 m/s^2 for 3 s. What is the final kinetic energy (in J) of the ball after 3 s?
Answer:
144 joules
Explanation:
v=initial velocity+(acceleration × time)
v=0+(4×3)
v=12m/s
k.e =0.5 × mass × velocity^2
=0.5 × 2 × 12^2
=1 × 144
=144 joules
Does a paddle boat’s wheel rotate clockwise or counterclockwise? PLS HELP
A runner runs the first 400 m of a race in 75 s, the second 400 m in 70 s and the final 800 m in 160 s.
Problem 2, Question 1: What is the total distance traveled?
Problem 2, Question 2: What was her average speed for this run?
helpp this is for today
Answer:Distance. Time. If a car travels 400m in. 20 seconds how fast is it going? Speed = Calculate the speed: If you move 50 meters at a speed of 10 2 miles in 15 minutes.
I she is running 8 miles every 60 minutes (which is 1 hour), so she is running 8 miles per hour.
we can see that her pace is 7.5 minutes per mile.
hope this helps
A person weighing 600 N is standing in an elevator. If the upward force of the elevator on the person is 800 N, which of the following is true?
Answer:
person is accelerating downwards
Explanation:
We are told that the force of the person standing on the elevator is 800 N acting downwards.
We are also told that the upward force of the elevator on the person is 600 Newtons.
This means that Upward force is lesser than downward force and thus the person is accelerating downwards
In your own understanding what is psychology?
Answer:
psychology is the science of mind and behavior.psychology is the scientific discipline that studies mental states and processes and behaviour in humans and other animals.Answer:
The study of mind and behavior is known as psychology. Psychology is the scientific study of both conscious and unconscious events, as well as feelings and thoughts. It's a vast academic field that straddles the scientific and social sciences.
balls and rods set up to represent a solar system
a set of organs and structures that provide digestion in the human body
the defense plan of a football team drawn on a whiteboard
Which option correctly identifies each description?
I. system
II. model
III. systemI. system, , II. model, , III. system , ,
I. model
II. model
III. systemI. model, , II. model, , III. system , ,
I. model
II. system
III. model
, I. model, , II. system, , III. model
I. system
II. system
III. model
If the mass is 2.0 kg and the acceleration is 5 m/s/s, then what is the force?
Answer:
Explanation:
F = ma = 2.0(5) = 10 N
Linearize equation T=KL^n
9. An elevator uses 650.0 watts to lift 5 passengers 30.0 m in 15.0 seconds. What is the force needed to lift the elevator and the passengers?
Hi there!
We can begin by calculating the total WORK done using the equation:
Power · time = Work
650 · 15 = 9750 J
We know that:
Work = Force · displacement (W = Fd), so:
W/d = F
9750/30 = 325 N
A ball is dropped from a tower that is 206 m high, How long does it take to reach the ground?
It will take 6.42 s for the ball that is dropped from a height of 206 m to reach the ground.
From the question given above, the following data were obtained:
Height (H) = 206 m
Time (t) =?NOTE: Acceleration due to gravity (g) = 10 m/s²
The time taken for the ball to get to the ground can be obtained as follow:
H = ½gt²
206 = ½ × 10 × t²
206 = 5 × t²
Divide both side by 5
[tex]t^{2} = \frac{206}{5}\\\\ t^{2} = 41.2[/tex]
Take the square root of both side
[tex]t = \sqrt{41.2}[/tex]
t = 6.42 sTherefore, it will take 6.42 s for the ball to get to the ground.
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what does that mean?
Answer:
Acceleration is the rate at which the velocity changes .
Hope it's help you !!
An LED bulb transfers 200J of energy in 20s. Its power rating is ...
Answer:
[tex]\huge\boxed{\sf P = 10\ Watts}[/tex]
Explanation:
Given:
Energy = E = 200 J
Time = t = 20 s
Required:
Power = P = ?
Formula:
P = E / t
Solution:
P = 200 J / 20 s
P = 10 Watts
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AH1807salt is made up of what elements?
A.sodium and chloride
B.sodium and chlorine
C.sodium and copper
D.sodium and oxide
Answer:
The first option sodium and chloride
please give brainliest
Salt is made up of what elements?
= Sodium Chloride....