Answer:
c. Joints allow the roadway to expand and contract as cars put force on the bridge
Explanation:
The reasons why joints are allowed on roadway is to accommodate the contraction and expansion of the road as cars put force on them.
Most materials used in making roadways are susceptible to expansion and contraction. When a measure of force is applied their length either increases or decreases depending on the type of force. To accommodate these changes, joints are placed in roadwaysWhy is an iron bolt attracted to a magnet?
A. When it is in a magnetic field, it becomes a temporary magnet.
B. It becomes a temporary magnet, whether or not it is in a magnetic
field.
C. It is attracted to Earth's magnetic field, which is always present.
D. When it is in a magnetic field, it becomes a permanent magnet.
Please, asap
Answer:
A. When it is in a magnetic field, it becomes a temporary magnet.
Explanation:
An iron bolt is attracted to a magnet because when in a magnetic field, the iron becomes a temporary magnet.
This is because the iron aligns their electrons in the magnetic fields.
This causes that attraction between the magnet and the iron. Metals like iron are said to be ferromagneticUnpaired electrons in iron spin in such a way that they align with the magnetic fields of the magnet.When you put the iron cube in the olive oil and the brick cube in the water what loses heat more quickly and why? The oil or the water? Explanation why oil or water.
Answer:
Oil
Explanation:
The oil will lose heat more quickly compared to water. This is because oil has a lower specific heat capacity compared to water.
Specific heat capacity is the amount of heat require to raise the temperature of 1kg of a substance by 1k. Water requires a high amount of heat to attain this level and it will have high specific heat capacity. Such substance takes time to gain heat and also will take time to loose the heat. Oil has a lower specific heat capacity. It gains and loses heat easily.Consider this situation: A team of landscapers pull an
unplanted tree across the lawn. Of the forces listed, identify
which act upon the tree.
Normal
Gravity
Applied
Friction
Tension
Air Resistance
Answer:
Explanation:
all
2. A squirrel runs 15 m to the north and finds an acorn. The squirrel then turns back to the south
and runs 8 m, at that point he decides to change direction and runs 24 m to the east to bury his
acorn.
Answer:
24 m to the right/ to the east
You drive a bumper car into another bumper car whose driver has a much larger body mass than you do. Who experiences more of a jolt, you or the other driver?
Answer:
both drivers experience the same force. just with different "results"
Explanation:
Answer:
You do
Explanation:
Momentum is mass*velocity. So Newton's 3rd law equal and opposite reaction. Because you weigh less you will have more force act on you than the driver who weighs more.
A box is sitting on a very slightly
slanted shelf. It has remained still,
despite the slant. Suddenly, the box
slides off the shelf. This sudden
movement must be due to...?
A. The mass of the box
B. The weight of the shelf
C. Unbalanced forces
D. A ghost
unbalanced forces make an object:
A.accelerate
B.move at a constant speed
C.explode
D.come to rest
Answer:
i would have to say B makes the most sense
Explanation:
A 515-kg roller coaster is at the bottom of a loop with a radius of 10 m. If the speed at the
Bottom of the loop is 20 m/s, what is the force of the track pushing up on the vehicle at this
point?
Answer:
20600N
Explanation:
Given parameters:
Mass of the roller coaster = 515kg
radius = 10m
Speed = 20m/s
Unknown:
Force of the track pushing up on the vehicle = ?
Solution:
The force pulling the roller coaster along the track is the centripetal force.
To find the centripetal force, use the expression below;
F = [tex]\frac{mv^{2} }{r}[/tex]
where;
m is the mass
v is the speed
r is the radius
Now insert the parameters and solve;
F = [tex]\frac{515 x 20^{2} }{10}[/tex] = 20600N
When an atom that has no charge looses two electrons it becomes a
Answer: it becomes a positive ion
Explanation:
So, when an atom loses 2 electrons there will be no change in the number of neutrons. Therefore, an isotope will not form. Thus, it is concluded that when an atom with no charge loses two electrons, it becomes a positive ion.
Answer:
a positive ion
Explanation:
A quarterback can throw a 0.430 kg football at 75 m/h.
a. How much kinetic energy does the quarterback have to give to the
ball in order to give it that much kinetic energy?
Answer:
9.48*10^-5JExplanation:
Step one:
given data
mass of ball m=0.43kg
speed v= 75m/h >>>>> to m/s = 75*0.00027
v =0.021m/s
Required
the kinetic energy KE
Step two
applying
KE= 1/2mv^2
KE= 1/2*0.43*(0.021)^2
KE= 0.5*0.43*0.0004.41*10^-4
KE=0.000094815
KE=9.48*10^-5J
The kinetic energy is 9.48*10^-5J
You are running and want to drop an object that you're carrying into a box. You must let go of the object:
a. before the object passes over the box
b. after the object passes over the box
c. just as the object is passing over the box
Answer:
a. before the object passes over the box
Explanation:
To let in the object into the box, you must drop the object before its passes over the box.
This form of problem is a projectile motion. Dropping the object before it passes over the box will direct it into box at an angle. The object will drop in the box if it is dropped after passing or just as it passes over the box.help asap please!
calculate the answer to the correct number of significant digits.
-3.22 x 5.1
How long does it take for a hook to reach the top of a building if the velocity is 50 m/s
Answer:
how tall is building
Explanation:
In the periodic table, where can the atomic mass of an element be found?
Answer:
protons + neutrons
Explain:
Is equivalent to the number of protons and neutrons in the atom
Answer:
The atomic mass of an element is underneath the symbols whereas for Li or Lithium it is 6.94 then for B or Boron it is 10.81.
Explanation:
So in otherwords the atomic mass is right under the symbol of an element.
Plz help Select ALL of the objects that are accelerating?
1 An apple falling off of a tree that speeds up as it falls towards the ground
2 A racecar driving at a speed of 100 miles/hour as it goes around a curve in the racetrack
3 A beam of light traveling from the sun to the Earth at a speed of -300,000,000 meters/second
4 A bus that is slowing down as it approaches the bus stop
What process uses atomic particles of carbon and uranium to determine exact age?
a--Radioactive dating
b--Law of superposition
c--Relative dating
d--Geologic time
Answer: Radioactive dating
Explanation: I took the test, and use the other answer, and got it wrong. The test told me that this is the correct one.
Answer:
Radioactive dating
I took the test recentley :)
Calculate the final velocity of a 12Kg object falling 20 m.
Answer:
19.80 m/s
Explanation
you just multiply the acceleration of gravity by the amount of time since it was let go of. So you get: velocity = 19. 80 m/s^2 * time, or V = gt. The negative sign just means that the object is moving downwards.
Water (density = 1x10^3 kg/m^3) flows at 15.5 m/s through a pipe with radius 0.040 m. The pipe goes up to the second floor of the building, 3.5 m higher, and the pressure remains unchanged. What is the speed of the water flow in the pipe on the second floor?
Answer:
The speed of the water flow in the pipe on the second floor is approximately 13.1 meters per second.
Explanation:
By assuming that fluid is incompressible and there are no heat and work interaction through the line of current corresponding to the pipe, we can calculate the speed of the water floor in the pipe on the second floor by Bernoulli's Principle, whose model is:
[tex]P_{1} + \frac{\rho\cdot v_{1}^{2}}{2}+\rho\cdot g\cdot z_{1} = P_{2} + \frac{\rho\cdot v_{2}^{2}}{2}+\rho\cdot g\cdot z_{2}[/tex] (1)
Where:
[tex]P_{1}[/tex], [tex]P_{2}[/tex] - Pressures of the water on the first and second floors, measured in pascals.
[tex]\rho[/tex] - Density of water, measured in kilograms per cubic meter.
[tex]v_{1}[/tex], [tex]v_{2}[/tex] - Speed of the water on the first and second floors, measured in meters per second.
[tex]z_{1}[/tex], [tex]z_{2}[/tex] - Heights of the water on the first and second floors, measured in meters.
Now we clear the final speed of the water flow:
[tex]\frac{\rho\cdot v_{2}^{2}}{2} = P_{1}-P_{2}+\rho \cdot \left[\frac{v_{1}^{2}}{2}+g\cdot (z_{1}-z_{2}) \right][/tex]
[tex]\rho\cdot v_{2}^{2} = 2\cdot (P_{1}-P_{2})+\rho\cdot [v_{1}^{2}+2\cdot g\cdot (z_{1}-z_{2})][/tex]
[tex]v_{2}^{2}= \frac{2\cdot (P_{1}-P_{2})}{\rho}+v_{1}^{2}+2\cdot g\cdot (z_{1}-z_{2})[/tex]
[tex]v_{2} = \sqrt{\frac{2\cdot (P_{1}-P_{2})}{\rho}+v_{1}^{2}+2\cdot g\cdot (z_{1}-z_{2}) }[/tex] (2)
If we know that [tex]P_{1}-P_{2} = 0\,Pa[/tex], [tex]\rho=1000\,\frac{kg}{m^{3}}[/tex], [tex]v_{1} = 15.5\,\frac{m}{s}[/tex], [tex]g = 9.807\,\frac{m}{s^{2}}[/tex] and [tex]z_{1}-z_{2} = -3.5\,m[/tex], then the speed of the water flow in the pipe on the second floor is:
[tex]v_{2}=\sqrt{\left(15.5\,\frac{m}{s} \right)^{2}+2\cdot \left(9.807\,\frac{m}{s^{2}} \right)\cdot (-3.5\,m)}[/tex]
[tex]v_{2} \approx 13.100\,\frac{m}{s}[/tex]
The speed of the water flow in the pipe on the second floor is approximately 13.1 meters per second.
A 750 kg car zooms away from a red light with an acceleration of 7.8 m/s2. What is the
average net force in Newtons that the car experiences?
Answer:
5850N
Explanation:
Given parameters:
Mass of the car = 750kg
Acceleration = 7.8m/s²
Unknown:
Net force = ?
Solution:
According to Newton's second law of motion;
Force = mass x acceleration
To find the net force input the given parameters:
Net force on the car = 750 x 7.8 = 5850N
If mass1 of a student is 70 kg and mass of the Jupiter is 1.901 x 10^27 kg 1
and the distance between them is 6.98 x 10^7 m. Calculate for the Force
of Gravity in Newtons.
Answer:
lol girly same
Explanation:
what's the turtle's velocity??
Answer:
[tex]\boxed {\boxed {\sf v\approx0.24 \ m/s}}[/tex]
Explanation:
Velocity can be found by dividing the displacement by the time.
[tex]v=\frac{displacement}{time}[/tex]
The displacement is 4.77 meters and the time is 19.5 seconds.
[tex]displacement=4.77 \ m \\time=19.5 \ s[/tex]
Substitute the values into the formula.
[tex]v=\frac{4.77 \ m }{19.5 \ s}[/tex]
Divide.
[tex]v=0.244615385 \ m/s[/tex]
Let's round to the nearest hundredth (just to make the answer more concise).
The 4 in the thousandth place tells us to leave the 4 in the hundredth place.
[tex]v\approx0.24 \ m/s[/tex]
The velocity of the turtle is about 0.24 meters per second.
where can nuclear fusion be found
Answer:
In the core of stars
Explanation:
Nuclear fusion is usually found in the cores of stars.
In nuclear fusion, there is a combination of atomic nuclei to form a larger one.
The process is accompanied with the release of a large amount of energy. The energy released is used to set up another fusion reaction. In the sun, two hydrogen nuclei are combining to give a helium nuclei with the release of a large amount of energy.Answer:
Nuclear fusion of hydrogen to form helium occurs naturally in the sun and other stars.
Which factor does not affect the strength of an electromagnet?
O A. The number of coils of wire
O B. The material of the core
C. The placement of the ammeter in the circuit
O D. The number of batteries added to the circuit
C. The placement of the ammeter in the circuit
DESPERATE WILL GIVE BRAINLIST AND THANKS
The Cenozoic Era was the “age of the dinosaurs.”
Question 2 options:
True
False
What is an element and comepounds
Answer:
Explanation:
Element: consists of only one kind of atom, can't be broken down into a simple type of matter by either physical or chemical means and can consist as either atoms or molecules
Compound: consists of atoms of two or more different elements bound together, can be broken down into simpler types of matter by chemical means BUT not by physical means, has properties that are different from its component elements and always contain the same ratio of its component atoms.
Write one use of magnetic force and frictional force
Answer:
1.Magnetic Force - Used in cranes to separate metal junk from junkyards.
2.Frictional Force- Helps us to walk.
If an ant can move at a speed of 1.2mm/s, calculate the time taken by
it to travel 1km.
Answer:
Work shown below!
Explanation:
[tex]Time=\frac{Distance}{Speed} =\frac{1km}{1.2mm/s}=\frac{1}{1.2}=0.8333333[/tex]
What is the potential energy of a 2kg plant that is on a windowsill 1.3m high?
Answer:
P.E = 25.48 Joule
Explanation:
Here,
mass (m) = 2kg
height (h) = 1.3m
g = 9.8m/s^2
P.E = mgh
= (2) (9.8) (1.3)
P.E = 25.48 Joule
Thus, the potential energy of a 2kg plant that is on a windowsill 1.3m high is 25.48 Joule
-TheUnknownScientist
how do you find Speed and Velocity? (formula)
Basically speed is equal to distance divided by time
Explanation:
velocity is just speed and direction
The diagram shows an electric generator containing an electromagnet when the generator is working, what is in the wire?
A. Electric current
B. Chemical energy
C. Permanent magnets
D. Small batteries
Answer:
its electric current
Explanation:
