Answer:
a) 2.5s
b)24.2m/s
Explanation:
a) s = ut +1/2gt^2
Where u=0
Make t the subject and solve
b) v^2=u^2+2gs
Where u =0
Make v the subject and solve
A car weighs 2,000 kg. It moves along a road by applying a force on the road with a parallel component of 560 N. There are two passengers in the car, each weighing 55 kg. If the magnitude of the force of friction experienced by the car is 45 N, what is the acceleration of the car?
Answer:
The acceleration of the car is 4.10 m/s².
Explanation:
The acceleration of the car can be found using the following equation:
[tex] F = ma [/tex] (1)
Where:
F is the force
m is the mass
a is the acceleration
The force is:
[tex]F = F_{p} - F_{f}[/tex] (2)
Where:
F(p) is the parallel force = 560 N
F(f) is the force of friction = 45 N
By entering equation (2) into (1) we have:
[tex]F_{p} - F_{f} = (m_{c} + m_{p}*2)a[/tex]
[tex] 560 N - 45 N = (2000 kg + 55*2 kg)a [/tex]
[tex] a = \frac{2000 kg + 55*2 kg}{515 N} = 4.10 m/s^{2} [/tex]
Therefore, the acceleration of the car is 4.10 m/s².
I hope it helps you!
Which explanation is based on scientific evidence?
A. Using ancient techniques, it is possible to change lead into gold.
B. Chemical data collected from rock formations can be used to
determine that Earth is billions of years old.
C. The mineral quartz has properties that help protect the body from
illness.
D. The relative positions of the Sun, Earth, and stars at the time of a
person's birth can affect his or her personality.
Answer:
The answer is B. I hope this helps!
Explanation:
B is the only answer with a scientific explanation. You cannot change lead into gold, quartz can't protect you from illness, and the positions of stars and planets have no effect on a person.
Which best describes friction? A. a downward pull when objects fall through the air B. a constant force that acts on objects that rub together C. a downward pull on objects that roll on bumpy surfaces D. a constant force that pulls two objects toward each other
PLSSS I NEED HELP 20 POINTS!!!
Answer:
i believe its B
Explanation:
im taking physics and thats the only thing that makes sense to me haha
hope this is right and helps <3
Answer:
It's B: a constant force that acts on objects that rub together
Explanation:
A skater increase her velocity from 3 m/sec to 18 m/sec in 6 seconds.what is the skaters acceleration
- True or false: A 100 kilogram moon rock has more inertia on Earth than it does on the Moon.
True
False
Ice has a density of 0.920 g/cm3. An ice cubes mass is 100 g. What is its volume?
Answer:
[tex]\boxed {\tt 108.695652 \ cm^3}[/tex]
Explanation:
Volume can be found by dividing the mass by the density.
[tex]v=\frac{m}{d}[/tex]
The mass is 100 grams and density is 0.920 grams per cubic centimeters.
Therefore,
[tex]m=100 \ g \\d= 0.920 \ g/cm^3[/tex]
Substitute the values into the formula.
[tex]v=\frac{100 \ g}{0.920 \ g/cm^3}[/tex]
Divide. Note that the grams, or "g" will cancel each other out.
[tex]v- 108.695652 \ cm^3[/tex]
The volume of the ice cube is 108.697652 cubic centimeters.
the free body diagram four objects are shown Which object has a net force of -5 N down?
Answer:
F-5-89
Explanation:
Some parts of this window look brighter than others, even though the same amount of sunlight is striking all parts of the window.
This is happening because some of the light striking the window is
OA. being absorbed.
ОВ.
causing the window to break.
OC. being changed into sound.
OD. being changed into electricity.
Answer:
A
Explanation:
so it looks unequell but it is.
which of newtons laws explains why when you bump into something you fall backwards
Answer:
Newtons third law
Explanation:
every action has an equal but opposite reaction
it exerts the force back on you
could you vote me brainliest plz? thx :)
derive mean in science
Explanation:
derive its name from a Native American word meaning wild onion
An ideal Carnot engine operates between reservoirs having temps of 125 degrees C and -20.0 degrees C. Each cycle the heat expelled by this engine is used to melt 30.0 g of ice at 0.00 degrees C. The heat of fusion of water is 3.34 X 10^5 J/kg and the heat of vaporization of water is 2.25 x 10^6 J/kg. How much work is does this engine do each cycle? How much heat per cycle does this engine absorb at the hot reservoir?
Answer:
Q₁ = 15.78 KJ
W = 5.76 KJ
Explanation:
First we find efficiency of this ideal Carnot engine:
Efficiency = 1 - T₂/T₁
T₁ = source temperature = 125°C + 273 = 398 K
T₂ = Sink Temperature = -20°C + 273 = 253 K
Therefore,
Efficiency = 1 - 253 K/398 K
Efficiency = 0.365 = 36.5%
Now, we find expelled heat (Q₂), by using latent heat of fusion of ice:
Q₂ = mH
where,
m = mass of ice melted = 30 g = 0.03 kg
H = Latent Heat of Fusion of Ice = 3.34 x 10⁵ J/kg
Therefore,
Q₂ = (0.03 kg)(3.34 x 10⁵ J/kg)
Q₂ = 1.002 x 10⁴ J = 10.02 KJ
Now, we use another formula of efficiency to find absorbed heat (Q₁):
Efficiency = 1 - Q₂/Q₁
0.365 = 1 - 10.02 KJ/Q₁
10.02 KJ/Q₁ = 1 - 0.365
Q₁ = 10.02 KJ/0.635
Q₁ = 15.78 KJ
Now, for work done we have the formula:
W = Q₁ - Q₂
W = 15.78 KJ - 10.02 KJ
W = 5.76 KJ
I wave is a disturbance in matter that transfers energy through the matter.
Answer:
ok is this a question? if so i can edit my answer
Explanation:
Which option is a force:
A. velocity
B. acceleration
C. mass
D. weight
Answer:
D
Explanation:
Weight and force have same derived units
1. A Mars rover is packed inside an airbag lander that will bounce on the surface of the planet. The rover will bounce many times before coming to a stop. It is projected that on the first bounce, the lander will project upward at 75° above the horizon with a speed of 9.92m/s. A. How much time will elapse between this first bounce and the second bounce
Answer:
The value is [tex]t = 5.15 \ seconds [/tex]
Explanation:
From the question we are told that
The angle is [tex]\theta = 75^o[/tex]
The speed is [tex]v = 9.92 \ m/s[/tex]
The time taken is mathematically represented as
[tex]t = \frac{ 2 * v * sin (\theta )}{ g}[/tex]
=> [tex]t = \frac{ 2 *9.92 * sin (75 )}{ 9.8}[/tex]
=> [tex]t = 5.15 \ seconds [/tex]
7. A mass m1 of 250 g is on a table connected to a massless pulley, as shown. The coefficient of friction between m1 and the table is 0.228. What is the maximum value of m2 before m1 starts sliding across the table?
Answer:
The minimum mass of m2 before m1 starts sliding across the table is 57 grams
Explanation:
The given mass on the table, m1 = 250 g
The coefficient of friction between the table and the mass, m1, μ = 0.228
Therefore, the friction force, F[tex]_F[/tex] between the mass m1 and the table is given as follows;
F[tex]_F[/tex] = W₁ × μ
Where;
W₁ = The weight of m1 = Mass of m1 × Acceleration due to gravity
W₁ = 250 g × 9.81 m/s² = 0.25 kg × 9.81 m/s² = 2.4525 N
W₁ = 2.4525 N
Which gives;
F[tex]_F[/tex] = 2.4525 N × 0.228 = 0.55917 N
F[tex]_F[/tex] = 0.55917 N
By equilibrium of forces, the weight, W₂, of the mass m2 at which the mass m1 starts sliding is equal to the frictional force F[tex]_F[/tex] of m1 or 0.55917 N
Therefore, for slipping to occur, we have;
W₂ = 0.55917 N
However, W₂ = Mass of m2 × Acceleration due to gravity
∴ W₂ = 0.55917 N = m2 × 9.81 m/s²
0.55917 N = m2 × 9.81 m/s²
m2 = 0.55917 N/(9.81 m/s²) = 0.057 kg = 57 grams
The minimum mass of m2 before m1 starts sliding across the table is 57 grams.
1. When human bones are brittle due to eating too much dairy food, what is this called?
2. When a person is working out and they get dry mouth, dizziness, and lack of sweat, what is happening to them.
3. when the arteries of the human heart are clogged by years of plaque build up and the heart can not pump blood through the body correctly, what is this called?
4. Exercises like swimming and bike riding can be put in what exercise category?
5. Eating too much processed food can lead to you getting what?
6. Eating too much meet can lead to you getting what?
Answer:
1. Osteoporosis
2. Dehydration
3. Atherosclerosis
4. Aerobic exercise
5. Heart disease, obesity, diabetes and high blood pressure
6. Coronary heart disease, colorectal cancer, diabetes
Explanation:
1. Osteoporosis is the condition of the bones when they become easily fractured and less dense, such that injuries to the bones are likely to cause disability or pain
2. The bod becomes dehydrated in the event that there is insufficient water for proper functioning of the organs due to the loss of more water than the water that is taken in or absorbed.
3. Atherosclerosis is the building of plaque on the inside and outside of the walls of the arteries by cholesterol, fat, and other compounds in the blood often being taken as a problem or undesirable condition of the heart.
4. Processed foods are those that contain chemicals (that give them a good taste) in proportions that can cause illnesses
5. Taking large quantities of (red) meat such as burgers, or barbecued red meat, can lead to type 2 diabetes, cancers and stroke
what is the velocity of a plane that traveled 5000 miles north followed by 10000 miles north in 20 miles?
Answer:
potential energy
Explanation:
potential energy
Chemical energy, the energy stored in chemical bonds, is thus considered a form of potential energy. Some everyday examples of potential energy include the energy of water held behind a dam, or of a person about to skydive out of an airplane.
The velocity of a plane that traveled 5000 miles north followed by 10000 miles north in 20 hours would be 750 miles/hour.
What is Velocity?The total displacement covered by any object per unit of time is known as velocity. It depends on the magnitude as well as the direction of the moving object.
The mathematical expression for velocity is given by
velocity= total displacement/Total time
The total displacement of the plane = 5000 miles +10000 miles
=15000 miles
velocity = displacement/Time
velocity =15000/20 hours
=750 miles/hour
Thus, the velocity of the plane would be 750 miles/hour.
Learn more about Velocity from here,
brainly.com/question/18084516
#SPJ2
Your question seems incomplete, the complete question is,
what is the velocity of a plane that traveled 5000 miles north followed by 10000 miles north in 20 hours?
can someone please help me I don’t understand how i’m supposed to solve this
Answer:
the net force is 10 and it is pushing to the right
Explanation:
The net force is the total and sonce the 20N is overpowering the 10N it will have 10N which will put the 20N ahead
An arrow leaves a bow at 60 m/s at an angle of 30 degrees to the horizon.
60 m/s
30
Which best gives the total time of flight for the arrow before it returns to its original
height?
P.4C
Answer: 11
Explanation:
What are 2 examples of convection, 2 examples of conduction and 2 examples of radiation plsss answer
Answer:
this could probably be useful to you
Suppose you were designing an elevator. How could you use the concept of an Atwood machine to minimize the force required to move the elevator up and down? If possible, discuss your answer with your classmates and teacher.
Answer:
an elevator we can use a counterweight that has the same mass as the empty box,
Explanation:
An Atwood machine consists of two masses connected by a rope through a pulley, in this case the acceleration of the system is proportional to the difference in masses, in the case of equal masses the acceleration is zero.
In the design of an elevator we can use a counterweight that has the same mass as the empty box, in that case when there are no people in the elevator, the natural acceleration is zero and there is no need to apply any force and therefore no power is needed. the motor.
When you have people inside, the power of the motor is what you need to lift the people, not the box, this reduces the power needed by the elevator motor by a high factor.
Using Atwood machine concept, we can state that the elevator can use a system of counterweights that balance the weight inside the box and minimize the force required to move the elevator up and down.
We can arrive at this answer because:
An Atwood machine consists of a system of two masses that counterbalance each other.In this system, the acceleration is caused by the difference between these masses, if there are no differences between them, there is no acceleration of the system.In the case of the elevator, a counterweight system would provide a balance when there were people inside the box.This is because the counterweight would have the mass equal to the mass of the empty box and this would make the entire system not have acceleration.However, when people enter the box, there would be a difference in mass and the system would have acceleration, without forcing a greater force to do so, but using engine power.With that, we can say that an elevator can act as an Atwood machine.
More information:
https://brainly.com/question/5689083?referrer=searchResults
data?
11.) Hair color, gender, birthday, softness of a pillow are all examples of
A.) Qualitativel
B.) Quaternary
C.) Quantitatſve
PLEASE HELPPP :))
why do ocean ridges rise above the surrounding ocean floor?
Answer:
because of the disturbence beneath the ocean
hope helps u
6. A child tugs on a rope attached to a 0.62-kg toy with a horizontal force
of 16.3 N. A puppy pulls the toy in the opposite direction with a force 15.8
N.What is the acceleration of the toy? (Hint: Remember direction:
towards child or puppy?)
Answer:
Explanation:
Force Mass * acceleration
F = ma
a = F/m
Sum of force = 16.3N - 15.8N = 0.5N
Mass = 0.62kg
Substitute
a = 0.5/ * 0.62
a = 0.81m/s²
The acceleration of the toy is 0.81m/s²
What is avarage speed? (AS)
speed?
Answer:
average speed = total distance/total time
Sarah launches her purse straight up in air with a velocity of 30.2m/s
How high will it go?
Answer: 46.53
Explanation:
The mass of this astronaut on the moon is 84kg. If the astronaut is on the moon for 3 weeks then returns home, his mass will be (blank) kg ?
Answer:
84kg
Explanation:
If the mass of an astronaut in on the moon is 84kg on the moon. After the 3weeks in returning home, his weight will not change. The mass of the astronaut will remain the same which is 84kg. This is so because the acceleration due to gravity experienced by the body remains the same both in the earth and in moon.
(PLEASE ANSWER QUICKLY)
In the absence of friction, if a force acting on a moving object stops acting, the object will:
a. stop moving
b. keep moving at a constant speed
c. speed up
d. move at a slower speed
the Image shows a portion of the periodic table. which two elements have similar characteristics?
a.
neon and fluorine
b.
chlorine and sulfur
c.
fluorine and chlorine
d.
oxygen and chlorine
e.
argon and fluorine
this is science but I for some reason the science wasnt showing
Answer:
Option C) Fluorine and Chlorine.
Explanation:
According to the given options; the two elements that have similar characteristics are Fluorine and Chlorine.
As both the elements belong to the same group in the periodic table which is the halogen group and they have the same valency although their reactivities differ. Fluorine is more reactive than chlorine if compared. They both are placed in the same group which is Group 7 in the modern periodic table. As both the elements have 7 electrons in their outermost shell.
4. Jed drops a 10 kg box off of the Eiffel Tower. After 2.6 seconds, how fast is the box moving? (Neglect air resistance.)
Answer:29.4m/s
Explanation: Vf=Vi +at= 0 initial velocity +(9.8)(3)= 29.4 m/s
