Given :
The focal length of a concave mirror is 18 cm.
To Find :
The radius of curvature of the concave mirror.
Solution :
We know,
[tex]\text{Focal length}=\dfrac{\text{Radius of curvature}}{2}\\\\F=\dfrac{R}{2}\\\\R = 18\times 2\ cm\\\\R = 36 \ cm[/tex]
Therefore, the radius of curvature of concave mirror is 36 cm.
Hence, this is the required solution.
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
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.
at the instant shown in the diagram, the car's centripetal acceleration is directed
Answer:
At the instant shown in the diagram, the car's centripetal acceleration is directed is discussed below in detail.
Explanation:
The direction of the centripetal acceleration is in a circular movement is forever towards the middle of the roundabout pathway. In the picture displayed, the East direction is approaching the center. So, the course of the car's centripetal acceleration is (H) toward the east.
Which two actions could you take to weaken an electromagnet?
A. Use a wooden core instead of a steel core.
B. Replace a 9 V battery with a 3 V battery.
O C. Decrease the length of the connecting wires in the circuit.
D. Increase the number of wraps of wire around the core.
E. Include an ammeter in the circuit.
Answer:
a and b
Explanation:
first one breaks it and second one directly makes it weaker
Answer:
A and B
Explanation:
took the test
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]
A net force of 12.0 N causes an object to increase its speed from 15.0 m/s to 18.0 m/s during a 2.0 second interval. What is the mass of the object?
Answer:
Mass of object = 8kg
Explanation:
Since a= change in v/ change in t, a= (18-16)/2= 1.5
And F=ma Force =12a= 1.5m=?You can now solve for your unknown value of mass.
A net force of 12.0 N causes an object to increase its speed from 15.0 m/s to 18.0 m/s during a 2.0 second interval. The mass of the given object 8 Kg.
What is force?
A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Since a = change in v/ change in t,
a = (18-16)/2
a = 1.5
Force, f = ma
mass, m = F/a
m = 12/1.5
m = 8 Kg.
A net force of 12.0 N causes an object to increase its speed from 15.0 m/s to 18.0 m/s during a 2.0 second interval. The mass of the given object 8 Kg.
To learn more about force refer to the link:
brainly.com/question/13191643
#SPJ2
Help please 20 points ? ASAP
Answer:
21: Mass
22: Unbalanced Force
23: Friction
24: Balanced
Explanation:
Connie flew from Phoenix to flagstaff, a distance of 180 miles at a constant speed of 180 miles per hour. She then returned to the same airport at a stand speed of 90. Miles per hour. What was Connie average speed in miles/ hour
Answer:
120 miles/hour
Explanation:
The average speed is the ratio of total distance covered by an object or a body to the total time taken to cover the distance.
Mathematically,
Average speed = total distance covered/total time taken
In the case of Connie:
total distance = 180 + 180 = 360 miles
In order to calculate the time for each trip
speed = distance/time
time = distance/speed
From Phoenix to flagstaff:
time = 180/180 = 1 hour
From flagstaff back to Phoenix:
time = 180/90 = 2 hours
total time taken = 1 + 2 = 3 hours
Average speed = 360/3 = 120 miles/hour
Hence, the average speed is 120 miles per hour.
What is KBr (periodic table) def
Answer: Answered already
Explanation:
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.
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.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
What is a gene?
A.
A segment of a protein
B.
A segment of a DNA molecule
C.
A series of amino acids
D.
A series of DNA molecules
Answer:B. A segment of a DNA molecule
Explanation:
How massive is a frisbee if it accelerates at 12 m/s/s when a force of 6 newtons is applied to it?
if i want an thrilling job witch should i chose im stuck beetween,
1. horse rider
2. drawer
3. photographer
Answer:
horse rider
Explanation:
it will help in the future and its fun
What is the distance a shark can cover while swimming at a speed of 15.25 m/s for 18 seconds?
Answer:
274.5
Explanation:
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.
how do you find Speed and Velocity? (formula)
Basically speed is equal to distance divided by time
Explanation:
velocity is just speed and direction
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:
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:
A tall tree has more chance to break during the storm, why?
because the top part become weaker
Explanation:
Unfortunately, all trees have some potential to fail during heavy winds or other harsh elements, such as snow and ice. ... In these incidences, the tree trunk acts as a lever and the force applied to the roots and trunk increases with height and mass. Taller trees are more susceptible to windthrow.
"Windthrow" is a phenomenon that uproots a tree because the trunk acts as a lever applying force to the roots. ... Trees are more likely to uproot during strong winds especially if the tree is top-heavy which can also result in tearing, splitting and limb breakage
which are considered noble gases
Answer:Argon
Neon
Helium
Krypton
Xenon
I need help please; I'll mark you brainliest
Answer:
Its number 1.
Explanation:
Speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. ... Velocity is the rate at which the position changes. The average velocity is the displacement or position change (a vector quantity) per time ratio.
Answer:
It’s both I and II
Explanation:
Speed refers to how fast something goes by using the equation distance/time. So it only uses distance and time.
On the other hand velocity is basically speed, so it uses distance/time, but the only difference is velocity uses direction.
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
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:
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
6. A sled traveling at a speed of 3.0 m/s slows to a stop 4.0 m from the point where
its passenger rolled off. What is the magnitude of the horizontal net force that
slows the 110 N sled? (Assume ag = 10m/s2)
D
Answer:
-12.38 N
Explanation:
This question requires you to first find the acceleration then apply Newton's 2nd law of motion to find the force.
To find deceleration use the formula;
v²= u²+2ad ---where
v= final speed = 0 m/s
u= initial speed = 3.0 m/s
a= acceleration { in this case , deceleration} = ?
d= distance from the point where its passenger rolled off= 4.0 m
therefore ;
[tex]a=\frac{v^2-u^2}{2d}[/tex]
[tex]a=\frac{0^2-3^2}{2*4} =\frac{-9}{8} m/s^2[/tex]
Mass of the sled is calculated from its weight force.
Weight force = mg
mass of sled = weight force / g where g= 10 m/s²
mass of sled = 110/10 = 11kg
The magnitude of horizontal net force will be : F= ma where ;
m= mass of sled = 11 kg
a= deceleration = -9/8 m/s²
F = 11 * -9/8 = -12.38 N
Force is acting on the opposite direction of the initial motion of the sled.
The magnitude of the horizontal net force acting on the sled is 12.375 N.
Given data:
The initial speed of sled is, u = 3.0 m/s.
The final speed of sled is, v = 0 m/s.
The distance covered before stopping is, s = 4.0 m.
The weight of sled is, W = 110 N.
Using the Newton's second law, the net horizontal force acting on the sled is given as,
F = ma
here,
m is the mass of sled.
a is the acceleration of sled.
Mass is calculated from the weight as,
W = mg
110 = m (10)
m = 11 kg.
Now, using the second kinematic equation of motion to obtain the acceleration of sled as,
[tex]v^{2}=u^{2}+2(-a)s\\\\0^{2}=3^{2}+2(-a)4\\\\8a=9\\\\a=1.125 \;\rm m/s^{2}[/tex]
Then the magnitude of net horizontal force is,
[tex]F = ma\\\\F = 11 \times 1.125\\\\F = 12.375\;\rm N[/tex]
Thus, we can conclude that the magnitude of the horizontal net force is 12.375 N.
Learn more about the Newton's second law here:
https://brainly.com/question/19860811
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 happens whenever energy is transformed from one form to another?
Answer:
Energy transformation is when energy changes from one form to another – like in a hydroelectric dam that transforms the kinetic energy of water into electrical energy. While energy can be transferred or transformed, the total amount of energy does not change – this is called energy conservation.
Explanation:
Hope This Helps!!
God Bless!!
~DuffyDuck~
