Answer:4417 N
Explanation:
A car’s brakes decelerate it at a rate of -1.70 m/s2. What is the time, in seconds, required to slow the car from 15 m/s to 9.0 m/s?
Answer:
t = 3.52 s
Explanation:
Given that,
The deceleration of a car is, a = -1.7 m/s²
The initial velocity of the car, u = 15 m/s
Final velocity of the car, v = 9 m/s
We need to find the time that is required to slow the car from 15 m/s to 9 m/s. The definition of acceleration is :
[tex]a=\dfrac{v-u}{t}\\\\t=\dfrac{v-u}{a}\\\\t=\dfrac{9-15}{-1.7}\\\\t=3.52\ s[/tex]
So, it will take 3.52 seconds to slow the car from 15 m/s to 9 m/s.
can anyone help, i need help with this as well.
Answer:
B
Explanation:
I think this one is correct
c it is a answer of this question
HELP I WILL MARK BRAINLIEST!!!
A 40 kg boy is moving upwards upwards in a lift with an acceleration of 2 m /s ^2 what would be the weight felt by him if measuured in a scale?
Answer:
48kg[tex]f = ma \\[/tex]
[tex]w \: = \frac{f}{g} \\ [/tex]
Explanation:
[tex]f \: = ma \\ f - mg = ma \\ f = ma + mg \\ f = 40 \times 2 + 40 \times 10 \\ f = 480[/tex]
[tex]w = \frac{f}{g} \\w = \frac{480}{10} \\ w = 48kg[/tex]
Name two luminous objects other than the Sun
Answer:
The answer to this question is given below in this explanation section.
Explanation:
"Luminous objects"
Luminous object are objects that generate their own light. Illuminated objects are objects that are capable of reflecting light to our eyes.The sun is an example of a luminous objects,while the moon is an illuminated objects.During the day the sun generates sufficient light to illuminate objects on Earth.
Example:
The sunFlame in a lampTube lightElectric bulbName of luminous object
sun luminous moon luminousNon luminous object
Some object do not have their own light,they reflect light of other objects. These object are called non luminous object.
Example:
Moon reflect the light from the sun
other example are earth and other planets,paper,tree
-- any other star
-- a firefly
-- a flashlight
-- a meteor
-- a street light
-- a car headlight
-- a burning log
-- a night light
-- the hot wire in a toaster
-- an LED
-- a laser
-- a burning match
-- a lit candle
Please help!
A pulley system is hanged in a lift as shown below in the
figure. A and B are two masses each having m and 2m mass
respectively. If d is the distance from the floor to B and the
lift starts to move with acceleration a, the time taken by B to reach the floor is,
1)
[tex] \sqrt{ \frac{6d}{(g + a)} } [/tex]
2)
[tex]\sqrt{ \frac{6d}{g} }[/tex]
3)
[tex]\sqrt{ \frac{6d}{(g - a)} }[/tex]
4)
[tex] \frac{6d}{( g+ a)} [/tex]
5)
[tex]\sqrt{ \frac{2d}{(g + a)} }[/tex]
Answer:
B
Explanation:
Find the acceleration of the system
m2>m1
further m2 = 2m
and m1 = m
The acceleration is going to be the downward force created by m2 divided by the total mass (m2 + m2)
a = (m2*g - m1*g) / (m1 + m2)
a = (2m - m)*g/ (2m + m)
a = m * g/3m
a = 1/3 * g
Formula for time
Givens
distance := d
acceleration : = a
vi = 0
Kinematic Formula
d = vi * t + 1/2 a t^2
Solution
d = 0 + 1/2 * 1/3 g * t^2
6d = g * t^2
t^2 = 6d/g
t = √(6d/g)
Answer.
B
if you know the amplitude of a wave, you know the distance from?
Answer:
As waves travel, they set up patterns of disturbance. The amplitude of a wave is its maximum disturbance from rest (its undisturbed position). It is important to note that the amplitude is not the distance between the top and bottom of a wave but is always measured from the rest position. This is a common exam mistake.
Explanation:
- Which of the following does not move as a transverse wave?
A ultraviolet light
B sound wave
C surface water wave
D microwave
Which of these effects describes the change in pitch we hear
moving motorbike goes past?
A total internal reflection
B.refraction
C reflection
D Doppler
Which of the following does not make use of total internal re
A oscilloscope
B endoscope
C prismatic periscope
D optical fibres
Help me
will give the brainliest!
Please answer correctly.
Answer:
- Which of the following does not move as a transverse wave?
B. sound waves
because sound waves are longitudinal waves having compressions and rare factions.
Which of these effects describes the change in pitch we hear
moving motorbike goes past?
D. Doppler effect
Doppler effect is the phenomenon where there is apparent change in frequency (pitch) and wavelength of a wave due to relative motion of the sound source.
Which of the following does not make use of total internal reflection.
B. Endoscope
Endoscope doesn't use total internal reflection since no refraction takes place.
how much force is needed to accelerate a 48 kg object to 3 m/s²
Answer:
144 NExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
force = mass × acceleration
From the question we have
force = 48 × 3
We have the final answer as
144 NHope this helps you
A car hits a tree and doesn’t stop, but keeps going until severely damaged. This is because of _____.
Answer:inertia
Explanation:
A car hits a tree and doesn’t stop, but keeps going until severely damaged. This is because of the principle of Inertia.
What is newton's first law of motion?
It states that" When a body s at rest it remains at rest, and IF the body is in motion It remains in motion until an external force is applied to that object."
i.e
If F=0, Then v= constant
and when that constant =0 then the body is at rest.
Where F= force
v = velocity.
Inertia is the tendency of an object to resist changes in its state of motion. In this case, the car was moving at a certain speed before it hit the tree, and because of its inertia, it continued to move forward even after the collision with the tree.
The car only stopped when another force acted on it, such as the force of the tree, or the force of friction with the ground, which slowed it down and eventually brought it to a stop. The severe damage to the car was a result of the force of the impact, which was a combination of the car's speed and its mass.
Hence the car does not stop because of the principle of inertia.
To learn more about Inertia click:
https://brainly.com/question/3268780
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The diameter of Circle A is _________. EF AG EG FG
Answer:
The diameter is EF
Explanation:
Given
Circle A (See attachment)
Required
Determine the line that represents the diameter
First, it should be noted that the diameter of a circle is always a straight line.
From the attachment, the circle has the following straight lines:
E FE AA GA FIt should also be noted that the diameter passes through the center of a circle and divides it into two congruent parts.
From the list of straight lines above, only line EF satisfy this property
Hence, the diameter of the circle is line EF.
A building where it is very easy to hear soft voices is a acoustically dead room.
A. False
B. True
Answer:
False
Explanation:
i got it right
The statement is false. Because, the place where, it is easy to hear soft voices is acoustically good. Acoustically strong rooms facilitates the sound waves of even soft pitches.
What is Acoustics?Acoustics is the study of sound waves. Engineers strictly consider the concepts of acoustics to design the auditoriums and theater rooms to filter the sound effects in perfect pitches.
The frequency of a sound wave is called pitch. Thus lower frequency waves are lower pitch and they are termed as soft voices. Soft voices are hard to hear.
However, building where it is very easy to hear soft voices is acoustically good room. Therefore, the statement is false. The building is good in acoustics suitable for sound effects.
To find more on acoustics, refer here:
https://brainly.com/question/29842668
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Calculate the momentum of a 32 kg eagle diving down to the water to catch a fish. During the dive, the eagle
travels 100 m in 10 seconds. Show your work
The eagle momentum : 320 kg.m/s
Further explanationGiven
mass = 32 kg
d = 100 m
t = 10 s
Required
The momentum
Solution
The velocity of the eagle :
[tex]\tt v=\dfrac{d}{t}\\\\v=\dfrac{100}{10}=10~m/s[/tex]
The momentum (P) :
[tex]\tt P=m\times v\\\\P=32\times 10\\\\P=320~kg.m/s[/tex]
a 10-kg box is sitting at rest on a table. What is the net force acting on the box?
Answer:
the net force /resultant force is 0N
Explanation:
this is because newton's first law states that when there was no resultant force, the object will continue in its state of rest or uniform motion in a straight line.
as a result, the box is at rest. this the net for certain which is the resultant force is 0N, this doesn't mean that there is no force, it is just that the total force (after subtracting) is 0N
hope this helps,
Why do adults make bigger splashes when they jump into swimming pools than small children?
Answer:
it bc the adults are bigger then us kid so when they dip in the pool it makes bigger splashes
Explanation:
What happens in synthesis
Answer:
S phase or Synthesis
Explanation:
Is the phase of the cell cycle when DNA packaged into chromosomes is replicated. This even is an essential aspect of the cell cycle because replication allows for each cell created by cell division to have the same genetic make-up.
Hope this helps!!
Katie is walking in an orange grove. She looks at all of the orange trees. She wants to find out how many seeds are in each orange.
What can she do to collect data?
A.
Measure each tree to see how tall it is.
B.
Gather a few oranges and see how many seeds are in each.
C.
Plant an orange seed and see how much fruit grows on the tree.
D.
Count the number of trees in the grove.
Answer:
What she can do to collect the data is;
B. Gather a few oranges and see how many seeds are in each
Explanation:
The quantity Katie wants to find out is the number of seeds contained in each orange
Therefore, the required population = The number of seeds in a given orange
The method of estimation of the number of seeds per orange is sampling method, whereby the number of seeds in each of the orange in the sample is used to as an hypothesis as to the number of seeds expected in each orange of the entire population.
Therefore, in order to collect the data, she can gather a few oranges and see how many seeds are in each.
PLEASE HELP, MAJOR, brainest if correct
Jonas throws a ball up into the air. On its trip upward, the ball's velocity goes from 9.1 m/s to 0 m/s. On its trip downward, the ball's velocity goes from 0 m/s to -9.1 m/s. Did gravity do any work on the ball during the trip upward? Did gravity do any work on the trip downward? Justify your answer.
Answer:
1) Yes, the work done by gravity during the trip upward is -41.405·m J
2) Yes, the work done by gravity on the ball during the trip downward = 41.405·m J
Explanation:
The given parameters are;
The initial velocity of the ball on the way up = 9.1 m/s
The final velocity of the ball on the way up = 0 m/s
The initial velocity of the ball on its trip downward = 0 m/s
The final velocity of the ball on its trip downward = 9.1 m/s
1) The work done by gravity on the trip upward = The change in kinetic energy of the ball
The change in kinetic energy of the ball = 1/2 × m × 9.1² = -41.405·m J, given that the initial kinetic energy is 41.405·m J and the final kinetic energy is J
Where;
m = The mass of the ball
Therefore, the work done by gravity during the trip upward = -41.405·m J
2) Similarly gravity does work on the ball during the trip downward = 41.405·m J.
A car that experiences no frictional force is started and caused to move. For the car to continue in that motion, the gas pedal would have to be used:
Explanation:
Gas pedal is not required to used on friction less surface. On a friction less surface once the car is started and caused to move, car continues to move with same velocity as there is no opposing force. Therefore, no pressing of gas pedal required. However, this situation is not possible in real life, as friction is always present.
If you had a cup of hot tea, will the tea generally stop cooling when it reaches room temperature? Or will it keep cooling further (in small increments)?
Answer:
The tea will generally stop cooling when it reaches room temperature ️
what is the dimensional consistency of s = Vot + 1/2 at2
Answer:
The formula is dimensionally consistent
Explanation:
Dimensional Analysis
There are three fundamental magnitudes in Physics:
L = Length
T = Time
M = Mass
All the formulas and equations that use physical magnitudes must be consistent in their units.
For example, the formula:
[tex]\displaystyle s=v_ot+\frac{1}{2}at^2[/tex]
Is used to calculate the distance traveled by an object, knowing its initial speed vo, acceleration a, and time t.
The units for each magnitude are:
s = L
vo = L/T or [tex]LT^{-1}[/tex]
a = L/T^2 or [tex]LT^{-2}[/tex]
Let's analyze the dimensions of the magnitudes in the formula (the constant 1/2 is neglected because it doesn't affect the dimensional analysis):
[tex]\displaystyle L=L/T*T+L/T^2*T^2[/tex]
The first term simplifies to L because the T's simplify. The same happens with the second term, the squared T's simplify:
[tex]\displaystyle L=L+L[/tex]
Thus the formula is dimensionally consistent
A bus starts to move from rest. If it is accelerated by 0.8m/s2, calculate the velocity and distance traveled after 8 s.
We are given:_______________________________________________
Initial velocity (u) = 0 m/s
acceleration (a) = 0.8 m/s²
time interval (t) = 8 seconds
final velocity (v) = v m/s
distance travelled (s) = s m
Solving for the final velocity:___________________________________
We know that:
v = u + at [first equation of motion]
v = 0 + (0.8)(8) [replacing the variables]
v = 6.4 m/s
Hence, the final velocity is 6.4 m/s
Solving for the distance travelled:_______________________________
We know that:
s = ut + 1/2(at²) [second equation of motion]
s = (0)(8) + 1/2(0.8)(8)(8) [replacing the variables]
s = 1/2(6.4*8)
s = 25.6 m
Hence, the distance travelled is 25.6 m
The dancing bear family loves when their trainer gives them little treats to reward them for a good performance. If the trainer gives the dancing bear family 34 treats each show, how many treats will the trainer need for 22 shows?
Answer:
748 treats.
Explanation:
If the trainer gives out 34 treats and gave them out for 22 shows, then to find the total you need to multiply 34 by 22, or (a longer but more simple way) add 34, 22 times.
The teacher has 12 green and 15 purple stickers the students are given `an equal number of each color stickers how many green and purple stickers does each students get
Answer:
Each student gets 4 green stickers and 5 purple stickers or a total of 9 stickers.
Explanation:
The greatest common divisor (GCD) of two or more natural numbers or integers (not numbers with decimals) is the largest number that divides them. In other words, the Greatest Common Divisor is the greatest of the common divisors of several numbers. To calculate it, each of them is decomposed into prime factors. The GCD is the result of multiplying the factors that are repeated in all the decompositions, affected by the smallest exponent.
In the event that no factor is repeated, the GCD of those numbers is 1, and the numbers are said to be "prime to each other."
In this case, the decomposition of 12 and 15 is:
12 = 2²*3.
15=3*5
So the GCD between 12 and 15 is 3
Now, to calculate how many green and purple stickers each student receives, you simply divide the amount of each sticker color by 3.
12÷3= 4
15÷3= 5
So, each student gets 4 green stickers and 5 purple stickers or a total of 9 stickers.
State the hypothesis of this experiment
How about: If mass is increased starting at 100 grams and 10 minutes, then the time will increase by 10 minutes by each 100g increase.
What is the chemical formula for silver and oxygen
Answer:Ag2 O.
The formula for silver oxide is Ag2 O.
Explanation: one silver atom gives up an electron resulting in a +1 ion. Each oxygen atom requires two electrons to be stable.
What is the net force of the object below
A. 17 N right
B. 0 N
C. 3 N right
D. 3 N left
Answer:
Concept: Physics
So we have forces in the Fx planeWe do sum of Fx= 0 Next we establish F-f So 10N- 7N = 3N to the righthow can a simple machine lift a heavy load with smaller effort
Answer:
The axle is fixed to a frame or a block. The pulley is normally fixed to a support above the load. The load is tied to one end of the rope and the effort is applied at the other end. Such a pulley makes our work easier by simply changing the direction of the force, i.e. a load is lifted up using a downward effort.
May be this will help U
Answer:
The axle is fixed to a frame or a block. The pulley is normally fixed to a support above the load. The load is tied to one end of the rope and the effort is applied at the other end. Such a pulley makes our work easier by simply changing the direction of the force, i.e. a load is lifted up using a downward effort
Explanation:
Why does it take more force to get a resting object to move than it does to keep
a moving object going? (Hint: answer using ideas about microscopic
interactions) *
Answer:
Objects have a natural tendency to resist change. ... Heavier objects (greater mass) resist change more than lighter objects. Example: Pushing a bicycle or a Cadillac, or stopping them once moving. The more massive the object (more inertia) the harder it is to start or stop.