A person can jump out of an airplane at 5000 feet, without a parachute, AND land on the ground safely (without any injury), IF they can manage to do what physics trick?
Lengthen the moment/time of impact
Bend knees right before impact
Spread out arms and legs to slow down
Shorten the length/time of impact
Answer:
Momentum is equal to mass for velocity (p1=mv)
But momentum is also equal to Force for time of impact (p1=Ft). Hence the impact force is inversely proportional to the fall time and directly proportional to the mass and fall velocity : F=mv/t^2 or F=p1/t
If he slows down, v diminishes and F diminishes
Hence correct Answer is C
The Biot-Savart force law predicts the force on a charge moving ____ to a magnetic field.
a.perpendicular
b.parallel
Answer plzz
How do we apply Interval Training to our lower body for a workout?
If you know any of them, please help!!!!!!
I believe the answer for 1) is
PEgrav = mass • g • height
PEgrav = m *• g • h
physics!!! please help D:
if the roller coaster is 127 meters tall and has 622,300 J of potential energy how much does it weigh/ what is the mass?
Answer:
500 kg
Explanation:
using the formula Potential energy (p.e)=mgh where g= acceleration due to gravity whose value is 9.8
so,pe =mgh
622300=m*9.8*127
m=500kg
Why are very high temperatures and pressures required for fusion to occur?
to generate the neutrons that are needed to break the nuclei
to overcome the repulsion between the protons in the nuclei that join
to maintain the proper conditions to keep the chain reaction going
to keep the uranium fuel separate from the control rods
Explanation:
to overcome the repulsion between the protons in the nuclei that join
Answer:
bBBBB
Explanation:
to overcome the repulsion between the protons in the nuclei that join
10 turns of wire are closely wound around a pencil as shown in the figure. when measured using a scale as shown, the length of total turns is obtained 25mm. then a) What is the thickness of the wire? b) Express the thickness of the wire in centimetre.
please write correct answer
Answer:
a. The thickness of the wire is 2.5 mm.
b. The wire is 0.25 cm thick.
Explanation:
Number of turns of the wire = 10
The length of total turns = 25 mm
a. The thickness of the wire can be determined by;
thickness of the wire = [tex]\frac{length of total turns}{number of turns}[/tex]
= [tex]\frac{25}{10}[/tex]
= 2.5 mm
Therefore, the wire is 2.5 mm thick.
b. To determine the thickness of the wire in centimetre;
10 mm = 1 cm
So that,
2.5 mm = x
x = [tex]\frac{2.5}{10}[/tex]
= 0.25 cm
The wire is 0.25 cm thick.
A car of mass 800 kg goes round a corner of radius 65 m at a
speed of 10 m/s.
a) What size force is needed to achieve this?
b) Suggest how this force is likely to be obtained.
c) What force would be needed if the driver approached the
bend at twice the speed?
Answer:
a. Centrifugal force = 1230.77 Newton.
b. Centrifugal force = mv²/r
c. Centrifugal force = 4923.08 Newton.
Explanation:
Given the following data;
Mass = 800kg
Radius = 65m
Velocity = 10m/s
a. To find the force;
Centrifugal force = (800*10²)/65
Centrifugal force = (800*100)/65
Centrifugal force = 80000/65
Centrifugal force = 1230.77 Newton.
b. The force associated with the car is generally referred to as centrifugal force because it's the force required to keep the car in a curved or circular path. It can be calculated using the formula;
Centrifugal force = mv²/r
c. To find the force at twice the speed;
Velocity = 2 * 10 = 20m/s
Centrifugal force = (800*20²)/65
Centrifugal force = (800*400)/65
Centrifugal force = 320000/65
Centrifugal force = 4923.08 Newton.
a. To achieve a car of mass 800 kg goes round a corner of radius 65 m at a speed of 10 m/s , needed 1230.77 Newton centripetal forces.
b. When an object goes round a corner then centripetal forces keep that object moving in a curved path.
c. When speed is twice. then, 4923.07 Newton centripetal forces needed.
a. Given that car of mass 800 kg goes round a corner of radius 65 m at a
speed of 10 m/s.
Centripetal force ,[tex]F=\frac{mv^{2} }{r}[/tex]
Where m is mass, v is speed of object and r is radius.
Substituting all values in above equation.
[tex]F=\frac{800*10^{2} }{65} =1230.77Newton[/tex]
b. Centripetal force is defined as, the force that is necessary to keep an object moving in a curved path and that is directed inward toward the center of rotation.
As a car makes a turn, the force of friction acting upon the turned wheels of the car provides centripetal force required for circular motion.
c. When speed is twice, then [tex]v=10*2=20m/s[/tex]
Centripetal force,[tex]F=\frac{800*20^{2} }{65} =4923.08Newton[/tex]
Learn more:
https://brainly.com/question/17381741
If a planet we same massas Earth were discovered orbising Barnard's Suarat the same distance
at Earta is orbiting the Son, why would there be less gravitational action between his new planet
and Barmand's Sarthen there is between Earth and the Sun

what name given to the heat energy received from the sun
Answer:
solar energy
Explanation:
Please mark as the brainliest.
Answer:
The Name of the heat energy from the is called solar energy.
The electric field 1.22 m from
charge is 1570 N/C, pointing
toward the charge. What is the
charge? Include the sign of the
charge, + or -
(The answer is *10^-7 C. Just fill
in the number, not the power.)
(Unit = C)
Answer:
-2.6
Explanation:
it’s for Acellus
The charge with magnitude and sign is -2.6 x 10⁻⁷ C.
What is electric field?The field developed when a charge is moved. In this field, a charge experiences an electrostatic force of attraction or repulsion depending on the nature of charge.
Given, the electric field 1.22 m from charge is 1570 N/C, pointing
toward the charge.
The electric field and charge is related as
E = kq/r²
q = Er²/k
where k = 9 x 10⁹ N.m²/C²
Substitute the given values in the question, we have
q = 1570 x (1.22)² / 9 x 10⁹
q= 2.6 x 10⁻⁷ C.
Thus, the magnitude and sign of charge is -2.6 x 10⁻⁷ C.
Learn more about electric field.
https://brainly.com/question/15800304
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Pros and Cons of the Mercator projection as a scientific model.
And
Use what you wrote in the above table and turn it into a paragraph explaining the pros and cons of globes as a scientific model.
Answer:
ok i don't know the answer but I send you tomorrow
What do the flows of energy and matter through an ecosystem have in common?
Please help me answer this question !
Answer:
i believe it's the last one
Explanation:
because the first law of thermodynamics states that energy can be changed from one form to another, but it cannot be created or destroyed.
good luck :)
i hope this helps
have a great day !!
Reference point is required to calculate relative velocity. Why?
Answer:
he relative velocity (also or ) is the velocity of an object or observer B in the rest frame of another object or observer A.
Susie rolls a bowling ball down the alley and knocks over most of the pins. Explain why fewer pins were knocked over when her little brother rolled a basketball, at the same velocity, down the alley.
Answer:
The force used
Explanation:
This has to be because of the force used. Both Susie and her younger brother might have hit the ball with the same velocity, but they surely couldn't have hit it with the same force. The force with which Susie hurts it is heavier than that with which her younger brother hits it, and as such, Susie gets to fall down more pins than her brother will be able to. The ball has to have a lot of force in it for it to be able to knock off all the pins there. So basically, the more the force, the higher it's chances of hitting all the pins
Can someone please help me with this
Answer:
i dont know about this
Explanation:
Scientists classify stars by color: white, red, blue. The color of a star helps to tells us how
______ The star is.
Answer: Hot
Explanation: Scientist use the color of starts to determine how hot the surface temperature is.
Explain with reason that when sunlight is focused on a piece of paper with the help of a convex len the paper will burn.
Answer:
Convex lenses concentrates the light energy to one spot on the paper so that the heat energy accumulates on that one small spot of paper. ... As the heat increases, combustion will occur when the spot becomes too hot and the paper will burn.
Explanation:
Hope it helps!
If you dont mind can you please mark me as brainlest?
How does convection play a role in tornadoes?
Answer: The mesocyclone
Explanation: The unsaturated air, if moved upward, will be cooler than the surrounding air and it will sink. ... This convective action (that is, the circulation of air as a result of heat transfer) produces the huge clouds commonly associated with thunderstorms and tornadoes.
Hopes this help um pls mark me as brainliest
PLS ANSWER FAST WILL GIVE BRAINLEST!!!!!!!!!
what is the relationship between speed and kinetic energy? (In other words, how are the two related to one another?) Explain.
Answer:
The kinetic energy of an object is directly proportional to the square of its speed. That means that for a twofold increase in speed, the kinetic energy will increase by a factor of four.
Found it on the internet
Explanation:
Hope this helps dude
Help me please.......
The box is pulled horizontally across the floor by a force of 100 N and opposed by a frictional force of 60 N. The object accelerates at 4 m/s2 .
Answer:
10 kg
Explanation:
first find resultant force by subtracting the forces mass is force ÷ accelerationA football player kicked a ball at an angle of 37o above the horizontal with an initial velocity of 20 m/s, what is the maximum height reached by the ball? a. 62 m b. 26 m c. 7.4 m d. 5.1 m
Answer:
H = 8.45 m
Explanation:
Given that,
Angle of projection, [tex]\theta=37^{\circ}[/tex]
The initial velocity of the ball, u = 20 m/s
We need to find the maximum height reached by the ball. The formula for the maximum height is given by :
[tex]H=\dfrac{u^2\sin^2\theta}{2g}\\\\H=\dfrac{(20)^2\times \sin^2(37)}{2\times 9.8}\\\\H=8.45\ m[/tex]
So, the maximum height reached by the ball is 8.45 m.
A burst of sound takes 0.4 seconds to reach the seabed and return, if speed of sound in water is 1400m/s. what is the depth of water?
Explanation:
Given:
Speed of sound = 1400 m/s
Total time taken = 0.4 seconds
To find:
The depth of water
Solution:
As it take 0.4 seconds for the burst to reach the seabed and return (both ways), we can deduce that it takes 0.2 seconds to reach the seabed (one way).
This is because the speed of sound is a constant.
Now, to find the depth, we use the equation
Speed = Distance/Time
Here, we know the values of speed (1400 m/s) and time (0.2 seconds). Distance is the depth of the water, which we need to find. Let the distance be x.
Therefore
1400 = x/0.2
x = 1400 * 0.2
x = 280 m
We get the depth as 280 metres.
Feel free to ask me if you didn't understand any part.
Hope this helps! :D
if a 0.040-kg stone is whirled horizontally on the end of a 60-m string at a speed of 4.4 m/s, what is the centripetal force ? * 0.013 n 4 n 0. 32 n 20.1 n
Answer:
0.013N
Explanation:
[tex]F=\frac{mv^{2} }{r}[/tex]
m=0.04, v=4.4m/s, r=60
F=0.013 N
Which of the following is NOT considered an invasion game or sport?
A. Lacrosse
b. Golf
c. Football
D.
Capture the Flag
Answer:
Golf
Explanation:
Golf is NOT considered an invasion game or sport
if a car, going 20 m/s with a mass of 1000kg hits a garbage can, what is the momentum of the can and the car afterwards?
Answer:
Momentum is the product of the mass and velocity of an object.
[tex]p = m \times v[/tex]
[tex]p = 1000kg \times 20 \frac{m}{s} = 20000kg \times \frac{m}{s} [/tex]
III. A vehicle is travelling 105 km/h on a highway when the driver sees a moose in the
middle of the lane.
A. Determine the distance travelled by the vehicle while the driver is reacting.
Assume the driver's reaction time is 1.50 S.
Which of the following statements is true?
A. An object with stored energy cannot have mechanical energy.
В.An object with mechanical energy is always able to perform work.
C. An object with potential energy is always in motion.
D An object with kinetic energy is always positioned above the ground.
Answer:
В. An object with mechanical energy is always able to perform work.
Explanation:
Energy can be defined as the ability (capacity) to do work. The two (2) main types of energy are;
a. Gravitational potential energy (GPE): it is an energy possessed by an object or body due to its position above the earth.
b. Kinetic energy (KE): it is an energy possessed by an object or body due to its motion.
Furthermore, the mechanical energy of a physical object or body is the sum of the potential energy and kinetic energy possessed by the object or body and it is measured in Joules.
Mathematically, it is given by the formula;
Mechanical energy = G.P.E + K.E
Hence, the true statement is that an object with mechanical energy is always able to perform work.
Answer:
B
Explanation:
Answer:
В. An object with mechanical energy is always able to perform work.
Explanation:
Energy can be defined as the ability (capacity) to do work. The two (2) main types of energy are;
a. Gravitational potential energy (GPE): it is an energy possessed by an object or body due to its position above the earth.
b. Kinetic energy (KE): it is an energy possessed by an object or body due to its motion.
Furthermore, the mechanical energy of a physical object or body is the sum of the potential energy and kinetic energy possessed by the object or body and it is measured in Joules.
Mathematically, it is given by the formula;
Mechanical energy = G.P.E + K.E
Hence, the true statement is that an object with mechanical energy is always able to perform work.