Answer:
5.74 m/s
Explanation:
m1v1+m2v2=(m1+m2)*vf
2.5*2.5+0.4*26=(2.9)vf
16.65=2.9vf
vf=5.74 m/s
Helppp!!!!! Please!!
A 0.144 kg baseball approaches a batter with a speed of 20m/s . The batter lines the ball directly back to the pitcher with a speed of 30m/s . Find the impulse exerted on the ball . If the bat and ball were in contact for 0.012 sec , find the average force exerted on the ball by the bat
Answer:
The impulse exerted by the ball is 7.2 kg.m/sThe average force exerted on the ball by the bat is 600 N.Explanation:
Given;
mass of the baseball, m = 0.144 kg
velocity of the baseball, v₁ = 20 m/s
velocity of the batter, v₂ = -30 m/s (opposite direction to the ball's speed)
The impulse exerted by the ball is calculated as follows;
J = ΔP = mv₁ - mv₂
ΔP = m(v₁ - v₂)
ΔP = 0.144 [20 - (-30)]
ΔP = 0.144 ( 20 + 30 )
ΔP = 0.144 (50)
ΔP = 7.2 kg.m/s
The average force exerted on the ball by the bat is calculated as;
[tex]F = \frac{\Delta P }{t} \\\\where; t \ is \ time \ of \ contact= 0.012 \ s\\\\F = \frac{7.2}{0.012} \\\\F = 600 \ N[/tex]
In order to increase the final momentum of a golf ball, we could
a) follow through when hitting the ball
b) increase the force acting on it
c) increase the time of contact with the ball
d) swing as hard as possible
f) All of the above
Answer:
option f) all of the above
We will see that all of the given options would increase the momentum, so the correct option is f "all of the above"
How to increase the momentum?
Momentum is defined as the amount of motion, and it is given by:
P = m*v
Where m is the mass of the object and v is the velocity.
We can't change the mass of the golf ball, but we can change the velocity, and to do it, we need to increase the acceleration that we apply to the ball.
To increase the acceleration we can:
follow through when hitting the ball (the force is applied for more time, so the acceleration is larger).increase the force acting on it (it directly increases the acceleration).increase the time of contact with the ball (similar to the first option).swing as hard as possible (similar to the second option).Then all the options are correct, which means that the correct option is f.
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Please physics brainlist !
29. A wave source approaches your location, describe
the shift in wavelength and frequency you will
perceive.
Answer:
The waves travel at the same speed, but the observed frequency depends on any relative motion between the observer and source. When the observed frequency changes, so does the wavelength. If the observer and source are moving toward each other, then the frequency increases and the wavelength decreases.
Explain the different types of energy in a working wind turbine
Answer:
A wind turbine converts the kinetic energy of the wind into mechanical power.
The wind moves the turbine and the turbine produce energy.
rock at the edge of a cliff has kinetic energy because of its position.
True
False
its false rock is at edge
Empujamos un baúl 3 metros, para ello aplicamos una fuerza de 200 Newton. ¿Cuál es el trabajo realizado?
Answer:
Trabajo realizado = 600 Nm
Explanation:
Dados los siguientes datos;
Fuerza = 200 Newton
Distancia = 3 metros
Para encontrar el trabajo realizado; Trabajo realizado = fuerza * distancia
Sustituyendo en la ecuación, tenemos; Trabajo realizado = 200 * 3
Trabajo realizado = 600 Nm
Which of these is not a standard unit?
a. second
b. metre
c. hand span
d. gram
Answer: Hand span
Explanation: Hand span is not a standard unit.
Second is the unit of time.
Meter is the unit of length or distance covered by an object.
Gram is the unit of weight of an object.
Hand span is not a standard unit. This is because the size of hand varies from person to person. Hence, the correct option is (c) "hand span".
what is the gravitational potential energy when a bungee jumper
of 80 kg is lifted 60 m in a crane before jumping?
HELP!! AM I CORRECT?? PLS TELL ME, IF U ANSWER PROPERLY I'LL GIVE U BRAINLIEST!!
Answer:ur right I think
Explanation:
Answer:
HON, i'm going to be honest, i'm not sure but it sounds like it is the Universal Expansion from what I learned about space
I'm sure this helps but if it doesn't DON'T GIVE ME BRAINLIEST, if it does then do
b. What is the man's weight on Mars where the acceleration due to gravity is
3.7 m/s2 ? Show your answer in both Newtons and pounds.
Answer:
How much is the mass of man?
PLEASE HELLP ILL GIVE BrAINLY AND HEART
you are visiting a town that is in the middle of a large continent. How would you expect the ocean currents to effect the climate in the town?
A ) More Thunderstorms
B ) Cooler Temperatures
C ) Warmer Temperatures
D ) There is little effect on the town's climate
Answer:
D
Explanation:
The hot resistance of a 125V filament lamp is 500Ω. Determine the current taken by the lamp and its power rating.
Answer:
0.25 amps
Explanation:
V = IR
125 = I(500)
I = 0.25 amps
Which pair of moving pulses in a rope will produce
destructive interference?
Motion maps for two objects, Y and Z, are shown.
Y →
Z
x
How many seconds does Object Z start before Object Y?
2.
03
04
5
Answer:
i can't see the map plzz send the map
Answer:
its 3
Explanation:
I just took test
last question, can someone help please?
An automobile of mass 1.46 E3 kg rounds a curve of radius 25.0 m with a velocity of 15.0 m/s. The
centripetal force exerted on the automobile while rounding the curve is:
Answer:
Centripetal force = 13140 Newton.
Explanation:
Given the following data;
Mass = 1.46 E3 kg = 1.46*10³ = 1460 kg
Velocity = 15m/s
Radius, r = 25m
To find the centripetal force, we would use the following formula:
Centripetal force = mv²/r
Substituting into the equation, we have;
Centripetal force = (1460*15²)/25
Centripetal force = (1460 * 225)/25
Centripetal force = 328500/25
Centripetal force = 13140 Newton.
A body vibrates 100 times in 20 seconds. Find its frequency and time period.
plz answer this its urgent
Answer:
Vibrates 5 times a / every second
Explanation:
What happens to the arrangement of atoms in matter as it is heated?
Answer:
When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance.
Explanation:
One day, Pinki was ironing the clothes in her room. After half an hour of ironing, the light went off and Pinki went outside to the lobby of her house to check it there was any problem in the household circuit. At the same time, she listened the voice of her 4 years old daughter from the same room where she was ironing the clothes. Her daughter was about to touch the hot electric iron but at the same moment, Pinki entered in the room and pushed her daughter back from that place.
(a) On which effect of electric current, does the electric iron works?
(b)State the effect of electric current described here.
(c) Mention the values showed by Pinki here.
PLEASE ANSWER ASAP
Answer:
(a) An electric iron works on the heating effect of electric current
(b) The heating effect of an electric current is the tendency for electric current to cause the temperature of the material through which it is flowing to rise due to the resistance of the material
The heating effect, 'E', is given by the formula, E = I²·R·t
Where;
I = The current flowing
R = The resistance of the material
t = The time the material takes to heat up
(c) The values showed by Pinki here is the value of care, concern and prevention, to prevent the harmful effect of the high heat on the skin of her daughter
Explanation:
The Escape speed at the surface of a certain planet is twice that of the earth. what is its mass in unit of earth's mass?
Plzz help
Answer:
22Km/sec
Explanation:
name one material through which continuous flow of charge can be produced from heat energy
Answer:
A continuous flow of negative charges (electrons) creates an electric current. The pathway taken by a electric current is a circuit.
Explanation:
Answer:
Copper, and aluminum
Explanation:
NEED HELP ASAPTsunamis are often called tidal waves because they are caused by tides.
o True
o False
Answer:
false
Explanation:
a tsunami is almost always caused by an earthquake under water.
As time goes on, the ENTROPY in a closed system should increase. This is because of which Law?
A) Conservation of Energy
B) Conservation of Momentum
C) 1st Law of Thermodynamics
D) 2nd Law of Thermodynamics
E) None of these
Answer:
The answer is D
The second law of thermodynamics
Which of the following best completes the sentence for Newton's Third Law? In every interaction,
forces occur in
A. specific places
B. single units
C. one direction only
D. pairs
Answer:
D in pairs
Explanation:
Forces always come in pairs - equal and opposite action-reaction force pairs.
Which of these statements is true about the effect of a force exerted upon an object?
a. A large force always produces a large change in the object's momentum.
b. A small force always produces a large change in the object's momentum.
c. A small force applied over a long time interval can produce a large change in the object's momentum.
d. A large force produces a large change in the object's momentum only if the force is applied over a very short time interval.
Answer:
d. A large force produces a large change in the object’s momentum only if the force is applied over a very short time interval.
Explanation:
Momentum can be defined as the multiplication (product) of the mass possessed by an object and its velocity. Momentum is considered to be a vector quantity because it has both magnitude and direction.
Mathematically, momentum is given by the formula;
[tex] Momentum = mass * velocity [/tex]
Also, the impulse of an object is given by the formula;
[tex] Impulse = force * time [/tex]
In accordance with the impulse-momentum theorem, the statement which is true about the effect of a force exerted upon an object is that a large force produces a large change in the object’s momentum only if the force is applied over a very short time interval.
a wagon of mass 42 kg is pushed by a student a distance of 12.2 meters, and 297 j of work was sone on the wagon how much force did the student apply assuming that it was constant
Answer:
Force=2.484 N
Explanation:
[tex]f = \frac{w}{gh} \\ = \frac{297}{9.8 \times 12.2} \\ f = 2.484 \: n [/tex]
Hope it helped
PLS mark BRAINLIEST
A wagon of mass 42 kg is pushed by a student a distance of 12.2 meters, and 297 j of work was done on the wagon force did the student apply is 24.34 N.
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.
work = force*distance
force = work/distance
force = 297/12.2
force = 24.34 N
A wagon of mass 42 kg is pushed by a student a distance of 12.2 meters, and 297 j of work was done on the wagon force did the student apply is 24.34 N.
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Which of the following shows constant velocity?
Answer:cool
Explanation:
cool cool cool cool
Sound travels Faster through _____________ mediums.
A) Denser
B) Less Dense
C) Colder
D) Sound always travels at the same period
Answer:
I know for sure that it's either A or B have a great day sorry I don't know which one completely
I’m a god, a planet, and I measure heat. What am I?
mercury??????? my only guess
Mercury is that it?
4. Where would a tsunami be most likely to occur?
a. Cuba
coast of Ireland
b. New York City
d. Indonesia
Answer:
D. Indonesia
Explanation:
Indonesia's high frequency of tsunamis, due to its location along the Pacific Ring if Fire