Answer:
r = 255.68 m
Explanation:
When a body moves in a circular path, an acceleration, due to constant change in its direction, is developed, known as centripetal acceleration. The centripetal acceleration acts towards the center of the circular path. The formula to calculate the centripetal acceleration is given as follows:
ac = v²/r
where,
ac = centripetal acceleration = 22 m/s²
v = tangential speed = 75 m/s
r = radius of curve = ?
Therefore,
22 m/s² = (75 m/s)²/r
r = (75 m/s)²/(22 m/s²)
r = 255.68 m
The nucleus of most atoms is composed of which of the following sub-atomic particles? (A) tightly packed neutrons
(B) tightly packed protons and neutrons
(C) loosely connected protons and clectrons. (D) tightly packed protons.
Answer:
(B) tightly packed protons and neutrons
Explanation:
Nucleus of any atom is the dense central part of any atom.It consists of two sub-atomic particle namely proton and neutron.These sub-atomic parts are tightly packed in nucleus which makes the nucleus dense .This dense nucleus is responsible for most of the mass of atom.The atomic mass for any atom is decided by sum of the mass of proton and neutronThus, correct answer is
(B) tightly packed protons and neutrons
The nucleus of most atoms is composed of tightly packed protons and neutrons
The nucleus of an atom possess the following properties:
The nucleus are positively charged The nucleus are surrounded by a cloud of negatively charged electronsThe nucleus are very dense and small .The nucleus is a collection of particles called protons, which are positively charged, and neutrons, which are neutralThe nucleus contributes to most of the weight of an atom.Therefore, the nucleus is compose of tightly packed protons and neutrons
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Fill in the correct answers. A big wheel with twice the circumference of a small wheel will rotate with ____ the force and ___ the speed of the small wheel.
A) half, twice
B) Three times, half
C) twice, half
D) half, three times
Answer:
C.
Explanation:
""""""" Twice,Half """"""
A big wheel with twice the circumference of a small wheel will rotate with the force and the speed of the small wheel.
C) twice, half
Circumference of WheelA big wheel with twice the circumference of a small wheel will rotate with twice the force and half the speed of the small wheel.
It is the round circle found on the outside angle of the machine.
It is the adjusted barrel or rod-like portion put on the interior of the machine that's connected to the wheel and makes a difference to advance development.
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A car can complete a 800 m long lap in 10 s. What is the speed of the car
Answer:
80 mph
Explanation:
can you plzzzzz make me brainliest
Answer:
178.955mph or 179mph
Explanation:
✨calculator✨
The moon's light comes from
within the moon
the earth
the sun
stars in other galaxies
A 70kg man runs at a pace of 4 m/s and a 50g meteor travels at 2 km/s. Which has the most kinetic energy?.
Answer:
the 70kg man
Explanation:
because he has more weight and is moving faster
2. A flower pot falls from a balcony ledge to the sidewalk below. If the flower pot
falls a distance of 30m, find a) the time it takes to hit the sidewalk b) the velocity
when it hits the sidewalk
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
pls help
will give the brainliest!
Explanation:
longitudinal wave .
they are composed of rarefaction and compression
there is change of pressure variations through medium
there is change in density throughout the medium
they can be propagated in liquid soild and gasses
example sound wave
transverse wave
they are composed of troughs and Crest
there is no pressure variations throughout the medium
there is no change in density
they can propagated in liquid soild but not gases
example light wave
What is the relationship between mass and kinetic energy?
Answer:
Direct relation
Explanation:
When an object of mass m is moving with some velocity v, it will have kinetic energy. It is possessed by an object whenever an object is in motion. It can be given by the below formula.
[tex]E_k=\dfrac{1}{2}mv^2[/tex]
It is very clear that the kinetic energy of an object is directly proportional to its mass. When the mass increases, its kinetic energy increases directly.
sue is running down the street at a nice constant 4 m/s. She travels for 200 seconds. How far did she go?
Answer:
800 meters
Explanation:
4 x 200 is 800 meters.
Kind of energy that an object has due to its motion.
Answer:
The energy an object has due to its motion is called kinetic energy
Explanation:
Factors Affecting Kinetic Energy: the kinetic energy of an object depends on both its speed and its mass.
Answer:
kinetic energy
Explanation:
In physics, the kinetic energy (KE) of an object is the energy that it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its stated velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. The same amount of work is done by the body when decelerating from its current speed to a state of rest.
Question 14
1 pts
An object has a mass of 14 grams and a density of 7 g/mL. When placed in water it sinks. What is the
Volume of water displaced?
-28g
-14ml
-98ml
-2ml
Answer:
The answer is 2 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\[/tex]
From the question
mass = 14 g
density = 7 g/mL
So we have
[tex]volume = \frac{14}{7} \\ [/tex]
We have the final answer as
2 mLHope this helps you
Please help! I have no idea what to do.
Jack weighs 159 pounds on Earth. What is his mass, in kg? Show your work.
Thank you!
there are 2 speed cameras,one in area where the speed limit is 30km/h,and another in area where the speed limit is 50km/h,IN WHICH ONE WILL THERE BE A SMALLER TIME INTERVAL BETWEEN THE PHOTOGRAPHS,explain your answer.
(help)
Answer:
Where speed limit of speed camera is 50 km/h.
Explanation:
Speed cameras work on the principal that photos reflected from the moving car have a higher or lower frequency. This is the Doppler principal. In a car traveling at the speed of light, the waves/particles will not be able to catch up with that car thus no photon will reflect back to the receiver/speed camera thus no speed will be record. Such a speed is impossible to achieve due to the amount of infinite energy expenditure required. This means if the speed is higher and approaching that of light, the frequency of reflected photons will be very high causing high amounts of energy that could damage the speed camera and cause detection. When the car travels at a higher speed, the photos frequency is high thus more energy they will carry and high chances of the vehicle being detected. This means the time interval of photos taken will be smaller.
What does WNBA stand for
Answer:
Women's national basketball association
Explanation:
Answer: womens national basketball association
Explanation: my dream
A car in front of the school goes from rest to 27 m/s in 3.0 seconds. What is its acceleration (assuming it is constant)?
Answer:
81 miles per hour
Explanation:
To get the answer, you should multiply 27 by 3, you should multiply distance by time to get the speed.
Answer:
9 m/s²
Explanation:
´Acceleration (a) is the change in velocity (Δv) over the change in time (Δt), represented by the equation a = Δv/Δt. This allows you to measure how fast velocity changes in meters per second squared (m/s^2). Acceleration is also a vector quantity, so it includes both magnitude and direction.´
Why is electricity created at peak times not as efficient?
Explanation:
electricity created at peak........
Describe an experiment the student could do to measure the specific heat capacity of a metal
Answer:
Steps to determine the specific heat capacity.
1. Place a beaker on a balance and press zero.
2. Now add the oil to the beaker and record the mass of the oil.
3. Read the starting temperature of the oil.
4. Connect a joulemeter to the immersion heater.
5. Time for thirty minutes.
6. Read the number of joules of energy that passed into the immersion heater.
7. Read the final temperature of the oil.
8. Use the following formula to calculate the specific heat capacity.
Explanation:
plz mark as brainliest aswer
b) What is work? Write down the types of work.
1. Compare pressure that fluid applies to the bottom of a glass with the pressure it applies to the sides of the glass
When the velocity increases does the kinetic energy increase or decrease ?
Because the mass is constant, if the velocity is increased, the kinetic energy must also increase.
Why sound needs medium for propagation? A particle oscillates 40 times in one minute what
will be its time period of oscillations.
plz say me the answer
fast I will mark as brainliest
Answer:
ca taode na kadato itoi runa ko
Answer:
Explanation:
Sound needs a material medium for their propagation like solid, liquid or gas to travel because the molecules of solid, liquid and gases carry sound waves from one point to another. Sound cannot progress through the vacuum because the vacuum has no molecules which can vibrate and carry the sound waves.
Frequency= no. of oscillations/time=40/60sec
4/6=0.66
Ecology is the study of
O Genetics
O Organisms and their environment
O Human Anatomy
O Cells
Answer:
Organisms and their environment
Electronegativity affects the strength of intermolecular forces. A very electronegative atom will create a stronger negative charge . True or false
Answer:
Electronegative atom will create a stronger negative charge is true.
Explanation:
Given that,
Electronegativity affects the strength of intermolecular forces.
We know that,
Electronegativity :
Electronegativity is a ability of an atom, shared electron to itself.
In periodic table,
When we move left to right in period then the electronegativity increases.
When we move up to down in a group then the electronegativity decreases.
We know that,
The intermolecular forces are dipole-dipole interactions which is the strongest intermolecular force of attraction.
If the electronegativity of atom is more, then the atom gain negative charge.
When the attraction force is more in atoms then the electronegative will be more.
Hence, Electronegative atom will create a stronger negative charge is true.
Your science class is going to play a game of tug-of-war and you need to divide up the teams. There are 11 people participating. If you want equal teams, how would you decide who is on which side and why? Use what you have learned about Newton's Laws of motions to explain.
Answer:
5
Explanation:
Why violet has the strongest energy?
Answer:
Explanation:
Because violet waves have the shortest wavelength of the visible light spectrum, they carry the most energy.
If you were to push on the wall with a force of 100N, how much force would the wall push back towards you?
Answer:
100n
Explanation:
Answer:
-100N
I hope this helps!
3The diagram shows three objects that are
moving. A force acts on each object. For each.
say how its movement will change.
Answer:
ball moves forward
direction of moving car is reversed
plane changes the direction
The force on the ball acting to the right may changes its falling to the net. The north-east force acting on the airplane can drag the plane to the eastward direction thus deviates the plane from north. The backward force acting on the car make it hindrance to its forward movement.
What is force?Force is an external agent acts on a body, to deform it or change its state from motion or rest. There are different type of forces such as magnetic forces, gravitational force.
Force accelerates a body to move where, as the mass increases, more force have to apply to accelerate the body. If two forces acting in opposite direction, the will cancel each other in magnitude.
The force acting on the ball makes it prevents from falling and the force acting on the plane can deviates its direction from north to eastwards. The backward force acting on the car decelerates the car from forward movement.
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A player kicks up a ball at an angle θ with the horizontal. The horizontal range is maximum when θ is equal to
Answer:
The horizontal range is maximum when θ is equal to 45°
Explanation:
Projectile Motion
It's known as the type of motion that experiences an object that is projected near the Earth's surface and moves along a curved path exclusively under the action of gravity.
Being vo the initial speed of the object, θ the initial launch angle, and [tex]g=9.8\ m/s^2[/tex] the acceleration of gravity, then the maximum horizontal distance traveled by the object (also called Range) is:
[tex]\displaystyle d={\frac {v_o^{2}\sin(2\theta )}{g}}[/tex]
Since the sine of an angle is bounded between -1 and 1, the maximum range will occur when the sine is 1:
[tex]\sin(2\theta)=1[/tex]
The only angle between 0° and 360° whose sine is 1 is 90°, thus:
[tex]2\theta=90^\circ[/tex]
Solving:
[tex]\theta=45^\circ[/tex]
The horizontal range is maximum when θ is equal to 45°
The horizontal range is maximum for the value of angle equivalent to [tex]45^{\circ}[/tex].
Given data:
The player kicks the ball with an angle [tex]\theta[/tex] with the horizontal.
The given problem is based on the concept and fundamentals of projectile motion. In a projectile motion, the horizontal range is the horizontal distance covered by an object during its trajectory.
The mathematical expression for the horizontal range is given as,
[tex]R = \dfrac{u^{2}sin2 \theta}{g}[/tex]
Here,
R is the horizontal range.
u is the initial speed.
And g is the gravitational acceleration.
Clearly, if we need maximum horizontal range, then we need to have the maximum value of sine. So if,
[tex]\theta =45^{\circ}[/tex]
[tex]sin2 \theta=sin90[/tex] = 1
So the maximum range is,
[tex]R = \dfrac{u^{2}sin(2 \times 45^{\circ})}{g}\\\\R = \dfrac{u^{2} \times sin 90^{\circ}}{g}\\\\R = \dfrac{u^{2}}{g}[/tex]
Thus, we can conclude that the horizontal range is maximum for the value of angle equivalent to [tex]45^{\circ}[/tex].
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PLEASE HELP!!! I need a good grade!
Answer:
The answer is D. You're Welcome !
Li and Raj are playing football. They take turns trying to run past each other with the football. Li weighs 125 pound and Raj weighs 175 pounds. Li discovers that if he changes direction quickly when running, he can always dodge out of the way before Raj can tackle him.
Why is Li able to avoid Raj’s tackle? Choose the best description.
Answer:
Li has less mass and therefore less inertia, so he can change his motion more easily than Raj.
Explanation:
Answer:
Li has less mass and therefore less inertia, so he can change his motion more easily than Raj.
Explanation:
