the brakes applied to a car produces an acceleration of 6m/s^2 in the opposite direction to the motion. if the car takes 2s to stop after the application of brakes. calculate the distance it travels during this time .
Answer:
acceleration= -6ms^-2
Explanation:
[tex]v = u + at \\ 0 = u + ( - 6 \times 2) \\ u = 12m {s}^{ - 1} [/tex]
distance
[tex]s = ut + \frac{1}{2} a {t}^{2} \\ s = 12 \times 2 + \frac{1}{2} \times ( - 6) \times {2}^{2} \\ s = 12m[/tex]
therefore distance = 12mHelp!! ASAP plz
Determine the mass of the object below to the correct degree of precision.
358.3g
358.20g
358.30g
358.2g
Indiana Jones is being chased over the rooftops of Marseilles by some random villain. He looks ahead and sees that there is a 7 meter gap between this rooftop, which is 25 meters above the ground, and the next, which is 19 meters above the ground. He gathers up all his strength and runs and leaps from the higher roof to the lower. How fast must he run so he doesn't go plummeting into the street below? *
5 points
Answer:
30 mph
Explanation:
Which one doesn't belong in the group? oxygen, sulfur, selenium,
tellurium *
Your answer
This is a required question
borons
If circuit A has twice the resistance of circuit B. The voltage is the same in each circuit.which circuit has the higher current?
Answer:
circuit b will have the higher current than circuit a
What does it mean when wave
crests are close together?
A. the higher the amplitude
B. the lower the amplitude
C. the shorter the wavelength
D. the longer the wavelength
Answer: C
Explanation:
Waves with a higher frequency have crests that are closer together, so higher frequency waves have shorter wavelengths.
A wagon, initially traveling at a constant 8.2 m/s, starts going down a hill that creates an acceleration of 9.0 m/s2. What is the wagon's velocity 6.6 s after it starts accelerating down the hill?
Answer:
67.6m/s
Explanation:
Given parameters:
Initial velocity = 8.2m/s
Acceleration = 9.0m/s²
Time = 6.6s
Unknown:
Final velocity = ?
Solution:
To solve this problem, we use the expression below:
Acceleration = [tex]\frac{v - u }{t}[/tex]
v is the final velocity
u is the initial velocity
t is the time taken
9 = [tex]\frac{v - 8.2}{6.6}[/tex]
v - 8.2 = 59.4
v = 59.4 + 8.2 = 67.6m/s
Ask Questions Action and reaction force pairs are all around you, but they aren't always obvious. Write down
a question about a situation in which you can't identify what force pairs are at work.
Answer:
Writing with a pencil. The pencil pushes on the paper. The paper pushes on the pencil.
Explanation:
Newton's third law.
Radar tells an air traffic controller that a jet is slowing as it nears the
airport. Which might represent the jet's velocity?
A. 700 h/km
B. 700 km
C. 700 km/hr
D. 700 km/h west
Choice-D is the only velocity on the list.
(It has a speed and a direction.)
The jet's velocity might be represented by 700 km/h west. Hence, option (D) is correct.
What is velocity?The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.
In this question, 700 h/km, 700 km have different unit that of velocity. So, option (A) and option (B) is not correct. . 700 km/hr has same unit that of velocity. But it does not has direction. So, option (C) is also incorrect. 700 km/h west has the same unit of velocity with define direction. So, option (D) is correct.
Hence option (D) is correct answer.
Learn more about velocity here:
https://brainly.com/question/18084516
#SPJ6
its urgent plssss help me :(
Answer:
(4) The particle travels with a constant velocity until t0 and then comes to rest.
Explanation:
Uniform rectilinear motion is defined as the motion of a particle in a straight line with constant velocity, that is, there is no change in velocity over time.
And this can be determined by means of the following equation:
[tex]x=x_{o}+v*(t-t_{o})[/tex]
where:
x = final point [m]
xo = initial point [m]
v = velocity (slope) [m/s]
t = final time [s]
to = initial time [s]
So the slope in the graph gives the constant velocity
[tex]v=\frac{x-x_{o}}{t-t_{o}}[/tex]
Therefore, after the time to there is no displacement, that is the particle comes to rest.
A 2 kg marble moving at 4 mi./s collides into a 1 kg marble at rest. After collision, the 2 kg marble speed decreased to 2 mi./s. Calculate the velocity and speed of the 1 kg marble immediately after colliding.
Please show work and please help me as fast as possible because this is time
Please help as soon as possible please
Please I’m begging
Answer:
[tex]2\sqrt{6}[/tex] [tex]\frac{mi}{s}[/tex]
Explanation:
Assuming there is no waste of energy:
[tex]K_{1} = K_{2}\\\frac{1}{2}m_{1}v_{1_{1}}^{2} + \frac{1}{2}m_{2}v_{2_{1}}^2 = \frac{1}{2}m_{1}v_{1_{2}}^{2} + \frac{1}{2}m_{2}v_{2_{2}}^2\\\\=> m_{1}v_{1_{1}}^{2} + m_{2}v_{2_{1}}^2 = m_{1}v_{1_{2}}^{2} + m_{2}v_{2_{2}}^2\\\\m_{1} = 2 kg, m_{2} = 1 kg, v_{1_{1}} = 4 \frac{mi}{s} , v_{2_{1}} = 0\\=> 32 = 8 + v_{2_{2}}^{2} => v_{2_{2}} = 2\sqrt{6} \frac{mi}{s}[/tex]
The common version of Newton’s second law of motion, EF= ma, is actually a special case that is true only when an objects _____ is constant.
-Mass
-Momentum
-Force
-Velocity
Answer:
A
Explanation:
only is true when the objects mass is constant
Answer:
A.
Explanation:
When the mass is constant. Newton's second law will work perfectly.
Fun fact you probably won't need to know this, but the original formula that Newton derived was F=change in momentum divided by change in time. Momentum will account for a change in mass. The schooling system lies to you all the time especially in physics.
In the figure shown, if angle i increases slightly, angler will
angle of
reflection
angle of
incidence
a. remain the same
Oc. increase
Ob disappear
O d. decrease
Answer:
Explanation:
According to law of reflection of light ,
angle of incidence = angle of reflection
angle of incidence = i
angle of reflection = r
when angle of incidence increases to i₁ and angle of reflection becomes r₁
According to law of reflection,
i₁ = r₁
i₁ - i = r₁ - r
increase in angle of incidence = increase in angle of reflection .
So angle of reflection also increases .
which of the following are likely to be affected by a magnet?
Check all that apply
A) a DVD
B) A floppy disk
C) A compact disk
D) A credit card
Answer:ye
Explanation:
A 300.0 g sample of water at 80.0°C is mixed with 300.0 g of water at
10.0°C. Assuming no heat loss to the surroundings, what is the final
temperature of the mixture? The specific heat capacity of liquid water is
4180 J/kg.°C *
Will give brainliest and lot of stars please help
Answer:
T_finalmix = 45 [°C].
Explanation:
In order to solve this problem, a thermal balance must be performed, where the heat is transferred from water with the highest temperature, to the water with the lowest temperature, so the final temperature of the mix must be equal once the thermal balance is achieved.
[tex]Q_{water}=Q_{methanol}[/tex]
where:
[tex]Q_{water}=m_{water}*Cp_{water}*(T_{waterinitial}-T_{final})[/tex]
mwater = mass of the water = 300 [g] = 0.3 [kg]
Cp_water = specific heat of the water = 4180 [J/kg*°C]
T_waterinitial = initial temperature of the water = 80 [°C]
T_finalmix = final temperature of the mix [°C]
[tex]Q_{water}=m_{water}*Cp_{water}*(T_{final}-T_{water})[/tex]
Now replacing:
[tex]0.3*4180*(80-T_{final})=0.3*4180*(T_{final}-10)\\100320-1254*T_{final}=1254*T_{final}-12540\\112860=2508*T_{final}\\T_{final}=45[C][/tex]
The final temperature of the mixture is 45 °C
Data obtained from the question Mass of warm water (Mᵥᵥ) = 300 g = 300 / 1000 = 0.3 KgInitial Temperature of warm water (Tᵥᵥ) = 80 °C Mass of cold water (M꜀) = 300 g = 300 / 1000 = 0.3 KgInitial Temperature of cold water (T꜀) = 10 °C Specific heat capacity of water (C) = 4180 J/KgºC Equilibrium temperature (Tₑ) =? How to determine the equilibrium temperatureHeat lost by warm water = Heat gained by cold water
Qᵥᵥ = Q꜀
MᵥᵥC(Tᵥᵥ – Tₑ) = M꜀C(Tₑ – T꜀)
0.3 × 4180 × (80 – Tₑ) = 0.3 × 4180 × (Tₑ – 10)
1254 (80 – Tₑ) = 1254(Tₑ – 10)
Clear bracket
100320 – 1254Tₑ = 1254Tₑ – 12540
Collect like terms
100320 + 12540 = 1254Tₑ + 1254Tₑ
112860 = 2508Tₑ
Divide both side by 2508
Tₑ = 112860 / 2508
Tₑ = 45 °C
Thus, the final temperature of the mixture is 45 °C
Learn more about heat transfer:
https://brainly.com/question/6363778
( pls help me i worked hard for these points! i hope u will not write anything for the points pls help me! due is today)
Answer:
a) 500 m
b) 50 s
c) speed= distance/time= 500/50= 10 m/s
hope it helps! please mark me brainliest
thank you! have a good day ahead
if u follow me, I will follow u back!
The acceleration of an object would increase if there was an increase in:
A.mass of the object
B.force on the object
C.inertia of the object
D.friction in the object
Answer:
Its either B or A
Explanation:
a person walks 60.0m and then walks 130m. what is the persons displacemnet if they walk east then west
Answer:
190
Explanation:
add because your looking for the Miles
When a person walks 60.0m and then walks 130m then the displacement of the person would be 70 meters if he first walked east and then west.
What is displacement?An object's position changes if it moves in relation to a reference frame, such as when a passenger moves to the back of an airplane or a professor moves to the right in relation to a whiteboard. Displacement describes this shift in location.
As given in the problem a person walks 60.0m and then walks 130m and if he first walks east then west then we have to find the displacement.
Displacement = final position -initial position
Lets us consider eastward as positive direction,
displacement = 60 - 130
= -70 meters
The negative sign represents the displacement would be in a westward direction.
Thus, If a guy initially went east and then west, his displacement would be 70 meters when he traveled 60.0 meters and then 130 meters.
Learn more about displacement here, refer to the link;
https://brainly.com/question/10919017
#SPJ6
We measure forces using the unit _________________ (AND). This is because mass is in kilograms (kg) and acceleration is in m/s2 . It describes the force required to move one kilogram of mass at one meter/second/second.
Answer:
Newtons
Explanation:
Force is measured in Newtons
An airplane accelerates from a speed of 88m/s to a speed of 132 m/s during a 15 second time interval. How far did the airplane travel during the time interval?
Answer:
[tex]1650\:\mathrm{m}[/tex]
Explanation:
We can use the following kinematics equations to solve this problem:
[tex]v_f=v_i+at,\\{v_f}^2={v_i}^2+2a\Delta x[/tex].
Using the first one to solve for acceleration:
[tex]132=88+a(15),\\15a=44,\\a=\frac{44}{15}=2.9\bar{3}\:\mathrm{m/s^2}[/tex].
Now we can use the second equation to solve for the distance travelled by the airplane:
[tex]132^2=88^2+2\cdot2.9\bar{3}\cdot \Delta x,\\\Delta x= \frac{9680}{2\cdot2.9\bar{3}},\\\Delta x =\fbox{$ 1650\:\mathrm{m}$}[/tex](three significant figures).
What is happening to the average kinetic energy of the molecules in a pot of water when it is heated on a stove? Explain your answer.
Answer:
Explanation:
The average kinetic energy of molecules in a pot increases when it is heated on a stove . The heat energy is spent to decrease the intermolecular attractive force . The result is increase in kinetic energy due to increase in the velocity of molecules
formula for kinetic energy of one mole of a monoatomic gas
= 3/2 RT
when temperature increases , kinetic energy increases .
Tasha would like to work in a Securities and Protective Services job. Which qualifications would she need to succeed? O observational skills, critical thinking, and physical strength O knowledge of fire hazards, courage, and driving skills ability to challenge suspicious people, multi-tasking skills, and driving skills understanding of legal documents, integrity, and knowledge of laws
Answer:the answer is letter D
Explanation:
Any object or agent (biological, chemical, radiological, and/or physical) that has the potential to harm people, animals, or the environment is considered a hazardous material.
What are Hazardous material?This may be the result of the material's own properties or its interactions with other substances. The U.S. Environmental Protection Agency (EPA), the U.S. Occupational Safety and Health Administration (OSHA), the U.S. Department of Transportation (DOT), and the U.S.
Nuclear Regulatory Commission are primarily responsible for defining and enforcing laws and regulations related to hazardous materials (NRC). Each defines "hazardous substance" differently.
This includes chemicals such as carcinogens, irritants, corrosives, toxic agents, sensitizers, agents that damage the lungs, skin, eyes, or mucous membranes; chemicals that can combust, explode, are flammable, oxidizers, pyrophorics, unstable-reactive or water-reactive.
Therefore, Any object or agent (biological, chemical, radiological, and/or physical) that has the potential to harm people, animals, or the environment is considered a hazardous material.
To learn more about Hazardous material, refer to the link:
https://brainly.com/question/14309081
#SPJ6
A negative charge of -0.00067 C and a positive charge of 0.00096 C are separated by 0.7 m. What is the force between the two charges?
Answer:
-11,813.87N
Explanation:
According to coulombs law, the Force between the two charges is expressed as;
F = kq1q2/d²
k is the coulombs constant = 9*10⁹kg⋅m³⋅s⁻²⋅C⁻².
q1 = -0.00067 C
q2 = 0.00096 C
d = 0.7m
Substitute into the formula:
F = 9*10^9 * -0.00067 * 0.00096/0.7²
F = 9*10⁹*-6.7*10⁻⁴*9.6*10⁻⁴/0.49
F = -578.88*10⁹⁻⁸/0.49
F = -578.88*10/0.49
F = -5788.8/0.49
F = -11,813.87N
Hence the force between the two charges is -11,813.87N
If a spring constant of 128N/m is compressed by 0.18 m , how much potential energy is the spring?
Answer:
2.1J
Explanation:
Given parameters:
Spring constant = 128N/m
Compression = 0.18m
Unknown:
Potential energy of the spring = ?
Solution
The potential energy of the spring is the elastic potential energy within the spring.
To solve this;
Elastic potential energy = [tex]\frac{1}{2}[/tex] k e²
k is the spring constant
e is the compression
Now;
Elastic potential energy = [tex]\frac{1}{2}[/tex] x 128 x 0.18² = 2.1J
I’m NC the wind is blowing from the north. If the wind changes direction and begins to blow from the south, what will most likely result.
NC means North Carolina.
Answer:
The temperatures will increase.
Explanation:
What will happen is that the temperature will increase. This is because, in wind direction and weather forecasting, a wind that shifts from the south means that warmer air/temperatures are approaching whereas a wind shift from the north implies that cooler air/temperatures are approaching.
A rectangle box was measured with a length of 4cm, width 2cm, and height 2cm. What is the volume of the box?
Answer:
volume is 64
Explanation:
2×2×4×4
=64
Answer:
[tex]V = 16\ cm^3[/tex]
Explanation:
The Volume of a Rectangular Prism
A rectangular prism is also called a rectangular box and has three dimensions all perpendicular to each other.
Given a rectangular prism of length L, width W, and height H, the volume is calculated as:
V = WLH
We are given the dimensions of a rectangular box: L= 4 cm, W = 2 cm, H = 2 cm. Computing the volume:
V = 2 cm * 4 cm * 2 cm
[tex]\mathbf{V = 16\ cm^3}[/tex]
goat gallops at -1.5m/s, how far will the goat travel in 20 seconds?
Please show work
Answer:
30m
Explanation:
Given parameters:
Speed of the goat = 1.5m/s
Time = 20s
Unknown:
Distance traveled = ?
Solution:
To solve this problem, we use;
Speed = [tex]\frac{distance}{time}[/tex]
Distance = Speed x time
So;
Distance = 1.5m/s x 20s = 30m
Pls answer nowwwwwwwww
Answer:
1 or a the first bubble
Explanation:
Please help me
27. A 20 kg object is at rest. A 6 N force pulls to the right on
the object for 10 seconds.
A) Find the impulse on the object.
B) Find the final momentum of the object.
C) What is its final velocity?
Answer:
a. 60 N*s
b. 60 (kg*m)/s
c. 3 m/s
Explanation:
Givens:
m = 20 kg
v_i = 0 m/s
t = 10 s
F = 6 N
a) Impulse:
I = F*t
I = 6 N*10 s
I = 60 N*s
b) Momentum:
p = v*m
F = m(a)
a = F/m
a = 6 N/20 kg
a = 0.3m/s^2
a = (v_f -v_i)/t
v_f = (0.3 m/s^2)*10 s
v_f = 3.0 m/s
p = 3 m/s*20 kg
p = 60 (kg*m)/s
c. Final velocity
a = (v_f -v_i)/t
v_f = (0.3 m/s^2)*10 s
v_f = 3.0 m/s
The impulse, momentum and final velocity can all be obtained from Newton's second law.
Let us recall that the impulse is obtained as the product of force and time.
Impulse = Force × time
Impulse = 6 N × 10 s = 60 Ns
From Newton's second law of motion;
F.t = mv - mu
Since the object was initially at rest;
F.t = mv
Hence, the final velocity of the object is 60 Kgms-1
The final velocity is obtained from;
F.t = mv
v = F.t/m
v = 6 × 10/20
v = 3 m/s
Learn more about impulse and momentum: https://brainly.com/question/904448
"Force is applied to an object and the object is moved over a distance in the same direction of the applied force" is the definition of (2 points)
a
balanced force
b
gravitational force
c
power
d
work
Answer:
A. Balanced force
Explanation: