Answer:
Dynamic stretches
Explanation:
Dynamic stretches are active movements where joints and muscles go through a full range of motion. When you do dynamic stretches you do not hold the stretch, instead you stretch with movement.
A force of 5 N gives to mass my and an acceleration of 8m/s2 and a mass m2
an acceleration of 24m/s2. What acceleration would it give if both masses are
tied together
Answer:
a=6m/sec²
Explanation:
f=5 N
a1=8m/sec²
a2=24m/sec
m1=f/a1=5/8kg
m2=f/a2=5/24kg
New, f=(m1+m2)a
a=5/5/8+5/24=5/15+5/24=24*5/20
a=6m/sec²
A race car with a 255 hp (1.90 × 105 W) engine is able to accelerate from rest to its top speed in 9.00 s. How much work does the car's engine do in this interval of time?
Answer:
W = 1710 kJ
Explanation:
Given that,
Power of a race car, P = 255 hP = [tex]1.9\times 10^5\ W[/tex]
It accelerate from rest to its top speed in 9.00 s.
We need to find the work does the car's engine do in this interval of time.
Power is given by work done per unit time. Mathematically,
[tex]P=\dfrac{W}{t}\\\\W=P\times t\\\\W=1.9\times 10^5\times 9\\\\W=1710\ kJ[/tex]
So, the required work done is is 1710 kJ.
Describe the motion of an object in which it's speed is constant but the velocity is changing?
Answer:
To summarize, an object moving in uniform circular motion is moving around the perimeter of the circle with a constant speed. While the speed of the object is...
What forces are acting on a book lying on the table? Are action-reaction forces involved in this situation?
Dr. Evil stands on a 150 m high cliff and drops the kittens straight down. Fill out the following table that shows how the velocity and acceleration of the kittens change with time during their fall.
Importance of measurement
Answer:
Without the ability to measure, it would be difficult for scientists to conduct experiments or form theories. Not only is measurement important in science and the chemical industry, but it is also essential in farming, engineering, construction, manufacturing, commerce, and numerous other occupations and activities.
Explanation:
Make sure to edit so you're not copy-writed and if this was helpful could I please get brain-list
How is matter changed from one state of matter to another? *
Explanation:
Matter is changed from one state to another by addition or removal of heat and suitable pressure conditions.
When a solid is heated, it normally melts and changes to liquids which on heating changes to vapor. The randomness of the particles increases from solid to liquid state and to gaseous states.
Also, a gas can be cooled to liquid and on further cooling transformed into a solid matter.
These phase changes are brought about by energy changes in a system. Some form of matter can also sublime by changing form solid to gas and vice versa.
which term best discribes our sun
Answer:
medium sized star
Explanation:
suppose you want to model girlfriend of a baby orangutan which type of model would you choose
Answer:
That model grilfriend would probably only want me for the cash and would talk to a million other guys...but the baby orangutan would love me and I would be able to take care of a cute baby!!:)
Explanation:
1. What is weight? What is mass? How are mass and weight different?
2. How does mass affect weight
If a bicyclist travels 25 km/h, how long will it take her to travel 40 km?
Answer: 1.6 hours
Explanation: 40/1.6 = 25
What does an osteologist do?
Answer:
Osteologists are trained to read and translate a bone's story.
Explanation:
This rare skill provides information that helps us better understand ancient cultures, solve mysteries, and learn about animals. Being an Osteologist means you have a variety of job opportunities.
Which statement best describes the difference between acceleration and velocity?
A. acceleration only shows a change in direction, but velocity shows a change in speed.
B .acceleration depends on direction, but velocity does not.
C. acceleration is a change in velocity, but velocity is speed in a given direction.
D. acceleration only shows change in speed, but velocity only shows a change in direction.
Answer:
C
Explanation:
acceleration is a change in velocity which means a time rate change in velocity but velocity is the time rate change in displacement
An object is dropped from a height of 78.0 m. How long will it take to hit the ground?
Answer:
3.98978287s
Explanation:
v²=u²+2as
v²=0²+2(9.8)(78)
v²=1528.8m/s
∴v=39.09987212m/s (speed when object hits the ground)
v=u+at
39.09987212=0+9.8t
∴t=3.98978287s
A ball is thrown vertically upwards with a velocity of 50 m/s. calculate
(a) the maximum height to which it rises.
(b) the total time it takes to return to the surface of earth. (take g =10 m/s2 )
Answer:
Given, For a vertically thrown upward,
Initial velocity (u) = 50m/s
Final velocity (v) = 0m/s { ∵ the body is thrown vertically upward }
Acceleration due to gravity(a) = -(g)= -10m/s²
Height reached (h) = ? , Time taken (t) = ?
We know that,v² = u²+2as
or, 0² = (50)²+2×(-10)×h { ∵ s=h }
or, 0 = 2500+(-20h)
or, 0 = 2500-20h
or, 20h = 2500
or, h = [tex]\frac{2500}{20\\}[/tex]
∴ h = 125metres
Also, v = u + at
or, 0 = 50+(-10)×t
or, 0 = 50-10t
or, 10t = 50
or, t = [tex]\frac{50}{10}[/tex]
∴ t = 5seconds ANS
Hence, The height reached by the ball is 125m and time taken is 5secs.
5. Which type of energy do all objects
contain?
Answer:
kinetic energy
Explanation:
HELP ASAP HELP Two tennis balls of the same mass are served at different speeds: 30 m/s and 60 m/s. Which serve has more kinetic energy and by how much? Defend your answer. *
Answer:
The second ball has four times as much kinetic energy as the first ball.
Explanation:
Kinetic Energy
Is the type of energy an object has due to its state of motion. It's proportional to the square of the speed.
The equation for the kinetic energy is:
[tex]\displaystyle K=\frac{1}{2}mv^2[/tex]
Where:
m = mass of the object
v = speed at which the object moves
The kinetic energy is expressed in Joules (J)
Two tennis balls have the same mass m and are served at speeds v1=30 m/s and v2=60 m/s.
The kinetic energy of the first ball is:
[tex]\displaystyle K_1=\frac{1}{2}m\cdot 30^2[/tex]
[tex]\displaystyle K_1=\frac{1}{2}m\cdot 900[/tex]
[tex]K_1=450m[/tex]
The kinetic energy of the second ball is:
[tex]\displaystyle K_2=\frac{1}{2}m\cdot 60^2[/tex]
[tex]\displaystyle K_2=\frac{1}{2}m\cdot 3600[/tex]
[tex]K_2=1800m[/tex]
Being m the same for both balls, the second ball has more kinetic energy than the first ball.
To find out how much, we find the ratio:
[tex]\displaystyle \frac{K_2}{K_1}=\frac{1800m}{450m}[/tex]
Simplifying:
[tex]\displaystyle \frac{K_2}{K_1}=4[/tex]
The second ball has four times as much kinetic energy as the first ball.
Answer:
he second ball has four X as much kinetic energy as the first ball
Explain:
Kinetic Energy Is the type of energy an object has due to its state of motion. It's proportional to the square of the speed
m/the mass of the object
v/the speed at which the object moves
The kinetic energy is expressed in Joules (J)
Two tennis balls have the same mass m and are served at speeds v1=30 m/s and v2=60 m/s.
Being m the same for both balls, the second ball has more kinetic energy than the first ball. So there for The second ball has four times as much kinetic energy as the first ball.
Which type of image can be projected on a screen?
real
plane
imaginary
virtual
This Is My Last Question PLZ Help
Answer:
A real image.
Explanation:
A real image is formed by real interaction of rays, hence it is possible to project it on a screen. And where a virtual image is drawn via back tracing the path of reflected rays, hence they don't meet in reality.
Where would you find information about an organization's guidelines for moral behavior?
change the following to celisus
a.-400f b.800f
please its urgent i will give u brainliest
I need help with this, Help me
Answer:
283.78
Explanation:
what's the difference between food chain and food web. i will give brainliest.
Answer:
Food chain is a linear transfer of energy from the producer to the consumer
producer →primary consumer → secondary consumer → tertiary consumer while food web is the interconnection of two or more food chains
What is the difference between oceanic crust and continental crust?
A 0.017-kg acorn falls from a position in an oak tree that is 18.5 meters above the ground. Calculate the velocity of the acorn just before it reaches the ground (rounding your answer to the integer) and its kinetic energy when hitting the ground (rounding your answer to the nearest tenth)
Answer:
The velocity of the acorn just before it reaches the ground is 19 m/s
The kinetic energy when hitting the ground is 3.1 J
Explanation:
Given;
mass of the acorn, m = 0.017 kg
height of fall, h = 18.5 m
Apply the law of conservation of mechanical energy;
mgh = ¹/₂mv²
gh = ¹/₂v²
v² = 2gh
v = √2gh
v = √(2 x 9.8 x 18.5)
v = 19 m/s
Thus, the velocity of the acorn just before it reaches the ground is 19 m/s
Now, determine the kinetic energy when hitting the ground;
K.E = ¹/₂mv²
K.E = ¹/₂(0.017)(19)²
K.E = 3.09 J
K.E = 3.1 J
Therefore, the kinetic energy when hitting the ground is 3.1 J
The carrot hangs from the ceiling by two ropes (1 and 2).
What is the correct free body diagram for the carrot?
Answer:
The Answer is D!
Explanation:
I checked it on Khan Academy.
The correct free body diagram of the hanging carrot is option B, where, the forces from two ropes and the net force acting upward and the gravitational force acting downwards.
What is free body diagram?A free body diagram is a representation of a body with different kinds of forces acting upon it with respect to its position and direction.
There are different kinds of forces namely magnetic force, tension force, nuclear force, gravitational force and the normal force etc. The force acting on a massive moving body will be the product of its mass and acceleration.
The direction of each force acting upon a body will be different and the displacement also. Here, the carrot hanged by the two ropes will experience forces from both ropes which hangs it down but the force acting is upwards and thus the net force is upward.
The gravitational force Fg acting on a body is always downward and thus the correct diagram depicting the free body of the carrot with forces is option B.
To find more about forces, refer the link below;
https://brainly.com/question/13191643
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Question 2
Radioactive dating involves determining which of the following?
Half-life decay
Index fossils
Depth of layers
Geologic time
Question 3
What process uses rock layers and index fossils to determine an object's estimated age?
Radioactive dating
Law of superposition
Relative dating
Geologic time
What, exactly, is moving across the medium?
Answer:
So waves are everywhere. But what makes a wave a wave? What characteristics, properties, or behaviors are shared by the phenomena that we typically characterize as being a wave? How can waves be described in a manner that allows us to understand their basic nature and qualities?
A wave can be described as a disturbance that travels through a medium from one location to another location. Consider a slinky wave as an example of a wave. When the slinky is stretched from end to end and is held at rest, it assumes a natural position known as the equilibrium or rest position. The coils of the slinky naturally assume this position, spaced equally far apart. To introduce a wave into the slinky, the first particle is displaced or moved from its equilibrium or rest position. The particle might be moved upwards or downwards, forwards or backwards; but once moved, it is returned to its original equilibrium or rest position. The act of moving the first coil of the slinky in a given direction and then returning it to its equilibrium position creates a disturbance in the slinky. We can then observe this disturbance moving through the slinky from one end to the other. If the first coil of the slinky is given a single back-and-forth vibration, then we call the observed motion of the disturbance through the slinky a slinky pulse. A pulse is a single disturbance moving through a medium from one location to another location. However, if the first coil of the slinky is continuously and periodically vibrated in a back-and-forth manner, we would observe a repeating disturbance moving within the slinky that endures over some prolonged period of time. The repeating and periodic disturbance that moves through a medium from one location to another is referred to as a wave.
Hope That Helps!!
Explanation:
Can some one help me please and thanks
Answer:
The way in which objects exert forces on each other is described by Newton’s 3rd law of motion
Explanation:
Objects with mass exert forces on each other via the force of gravity. This force is proportional to the mass of the two interacting objects and is inversely proportional to the square of the distance between them. The factors G, M, and rare the same for all masses at the surface of the Earth.
How dogs can help scientists better understand human disease
Answer:
They can also help us better understand human diseases. Because the development, progression and behavior of several disorders afflicting humans and dogs are so similar, understanding the genetic components of these diseases in dogs can give us an idea of what may be happening in humans.
Explanation:
.
A 3.2 kg ball that is moving straight upward has 17 Joules of kinetic energy. The total mechanical energy is 25 Joules.
What is the ball’s height above the ground?
What is the speed of the ball?
Answer:
h = 0.25 [m]
v = 3.26 [m/s]
Explanation:
In order to solve this problem, we must remember that mechanical energy is defined as the sum of kinetic energy plus potential energy.
E1 = Ek + Ep
where:
E1 = mechanical energy = 25 [J]
Ek = kinetic energy = 17 [J]
Ep = potential energy [J]
25 = 17 + Ep
Ep = 8 [J]
Now the potential energy is defined by the following equation:
Ep = m*g*h
where:
m = mass = 3.2 [kg]
g = gravity acceleration = 9.81 [m/s²]
h = elevation [m]
8 = 3.2*9.81*h
h = 0.25 [m]
The velocity can be calculated by means of kinetic energy.
[tex]E_{k} =\frac{1}{2} *m*v^{2}\\17 =\frac{1}{2} *3.2*v^{2} \\v= \sqrt{\frac{17*2}{3.2} }\\v = 3.26[m/s][/tex]
(a) The height of the ball will be h=0.25 m
(b) The speed of the ball will be [tex]V= 3.26\ \frac{m}{s}[/tex]
What will be the speed and the height of the ball?It is given that
Mass of the ball m=-3.2kg
The kinetic energy of the ball = 17 j
The total mechanical energy of the ball = 25 J
(a) So the total mechanical energy is the sum of the kinetic energy of the ball and the potential energy of the ball.
[tex]E_T=E_{KE}+E_{PE}[/tex]
Now putting the values of the KE and the Total energy we get
[tex]25=17+E_{PE}[/tex]
[tex]E_{PE}=8 \ J[/tex]
Now the formula of the potential energy will be
[tex]E_{PE}=mgh[/tex]
[tex]8=3.2\times 9.81 \times h[/tex]
[tex]h= \dfrac{8}{3.2\times 9.81}[/tex]
[tex]h=0.25\ m[/tex]
(b) Now to find out the speed of the ball we have
[tex]E_K=17\ J[/tex]
[tex]E_K=\dfrac{1}{2} mv^2[/tex]
[tex]v=\sqrt{\dfrac{2E_{KE}}{m} }[/tex]
[tex]v=\sqrt{ \dfrac{2\times17}{3.2} }=3.25[/tex]
[tex]v=3.25 \ \dfrac{m}{s}[/tex]
So the calculated answers will be
(a) The height of the ball will be h=0.25 m
(b) The speed of the ball will be [tex]V= 3.26\ \frac{m}{s}[/tex]
To know more about Kinetic and Potential energy follow
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