Answer:
40,000J
Explanation:
The heat energy required to raise the temperature of unit mass of substance through unit degree is called specific heat of substance . As given 2000J energy is needed to heat 1 kg of paraffin through 1
o
C, therefore specific heat of paraffin will be 2000J/kg−
o
C.
Now, heat energy required to raise the temperature of mass m of substance (specific heat c) through Δt is given by ,
Q=mcΔt,
Given: m=10kg,Δt=2
o
C,c=2000J/kg−
o
C
Q=10×2000×2=40,000J
How many Joules of heat are released from a 400g piece of glass that has been
cooled from 28°C to 6°C? The specific heat for this particular type of glass is 0.664
J/gºC.
Answer:
65c
Explanation:
1. Compare pressure that fluid applies to the bottom of a glass with the pressure it applies to the sides of the glass
Some girls use a curling iron to fix their hair. It is very hot when plugged in for a while. If you want protect your skin, you would need to pick it up on the plastic end. Which property of the plastic is portant for it to be used on a curling iron? a. Soluble in water b. Insulates thermal energy C. Conducts electrical energy d. Emits magnetic energy
Answer:
B. Insulates thermal energy
Answer:
b
Explanation:
if you insulate thermal energy aka heat you are keep the heat in one place in this case the metal, which provent you from burning your self if you hold the plastic part.
36 In the given circuit, A, B, C and D are four lamps connected with a battery of
60V.
Analyse the circuit to answer the following questions.
(i) What kind of combination are the lamps arranged in (series or parallel)?
(ii) Explain with reference to your above answer, what are the advantages (any
two) of this combination of lamps?
(iii) Explain with proper calculations which lamp glows the brightest?
(iv) Find out the total resistance of the circuit.
A parallel circuit, is one which the conductors leading into the bulbs are joined together on one side of the bulbs, and the conductors coming out of the bulbs are joined together on the other side of the bulb
The correct arrangement, advantages, lamp and resistance values are;
(i) The lamps are arranged in parallel(ii) Improved reliability Optimum performance of the bulbs(iii) Lamp C(iv) The total resistance is 4 ΩThe reason the above values are correct are as follows:
(i) From the diagram attached, the lamps are arrange in parallel
This is so because, each lamp is directly connected across the terminals of the the voltage source
(ii) The advantages of the bulbs arranges in parallel are;
The other lamps will continue working if one lamp becomes faultyThe voltage is applied directly to each lamp, such that the lamps are lit with the maximum power available in the circuit(iii) The brightness of the lamp is given by the power of the lamp
The lamp with the highest wattage, or power glows the most
Power, P = Voltage, V × Current, I
The power for lamp A, [tex]P_A[/tex] = 60 V × 3 A = 180 W
The power for lamp B, [tex]P_B[/tex] = 60 V × 4 A = 240 W
The power for lamp C, [tex]P_C[/tex] = 60 V × 5 A = 300 W (Brightest)
The power for lamp D, [tex]P_D[/tex] = 60 V × 3 A = 180 W
Therefore, lamp C has the highest power and glows the brightest
(iv) The total resistance is given by the voltage, divided by the total current
Total current, I = 3 A + 4 A + 5 A + 3 A = 15 A
[tex]Total \ resistance, \ R_{tot} = \dfrac{V}{I_{tot}}[/tex]
Therefore;
[tex]Total \ resistance, \ R_{tot} = \dfrac{60 \, V}{15 \, A }}=4 \, \Omega[/tex]
The total resistance, R = 4 Ω
Learn more about series and parallel circuits here:
https://brainly.com/question/12140473
Determine the launch speed of a horizontally launched projectile that lands 26.3 meters from the base of a 19.3-meter high cliff and takes 5 seconds to land.
Answer:
The launch speed is approximately 13.28 m/s
Explanation:
The given parameters are;
The distance from the base of the cliff the projectile lands = 26.3 meters
The height of the cliff, s = 19.3 meters
The time it takes the projectile to land = 5 seconds
The direction of the projectile = Horizontal
The vertical motion of the projectile is given as follows;
19.3 = 1/2 × g × t² = 1/2 × 9.81 × t²
t = √(2 × 19.3/9.81) ≈ 1.98 seconds
Therefore, the time it takes to land ≈ 1.98 seconds
The launch (horizontal) speed = (The horizontal distance)/(Horizontal time)
The launch (horizontal) speed = 26.3/1.98 ≈ 13.28 m/s.
The launch speed of a horizontally launched projectile is equal to 13.22 m/s.
Given the following data:
Time = 5 seconds.Height = 19.3 metersHorizontal distance = 26.3 meters.To determine the launch speed of a horizontally launched projectile:
First of all, we would calculate the time it took the projectile to land at the base of the cliff by using the maximum height formula:
[tex]H = \frac{1}{2} gt^2[/tex]
Making t the subject of formula, we have:
[tex]t=\sqrt{\frac{2H}{g} }[/tex]
Substituting the given parameters into the formula, we have;
[tex]t=\sqrt{\frac{2\times 19.3}{9.8} }\\\\t=\sqrt{\frac{38.6}{9.8} }\\\\t=\sqrt{3.94}[/tex]
Time, t = 1.99 seconds
Next, we would determine the launch speed by using the formula:
[tex]Horizontal\;speed = \frac{horizontal\;distance}{time} \\\\Horizontal\;speed = \frac{26.3}{1.99}[/tex]
Horizontal speed = 13.22 m/s
Read more: https://brainly.com/question/17742679
Planets A and B have the same size, mass, and direction of travel, but planet
A is traveling through space at half the speed of planet B. Which statement
correctly explains the weight you would experience on each planet?
A. You would weigh the same on both planets because their masses
and the distance to their centers of gravity are the same.
B. You would weigh less on planet B because it is traveling twice as
fast as planet A.
C. You would weigh the same on both planets because your mass
would adjust depending on the planet's speed.
D. You would weigh more on planet B because it is traveling twice as
fast as planet A.
Answer: A
Explanation:
Answer:
A. You would weigh the same on both planets because their masses and the distance to their centers of gravity are the same.
Explanation:
A pe x :)
a kid throws a ball from a tower 45 meters tall how fast is the ball going when it hits the ground?
Answer:
29.69 m/s
Explanation:
From the question given above, the following data were obtained:
Height (h) = 45 m
Velocity (v) =...?
Next, we shall determine the time taken for the ball to get to the ground. This can be obtained as follow:
Height (h) = 45 m
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) =?
h = ½gt²
45 = ½ × 9.8 × t²
45 = 4.9 × t²
Divide both side by 4.9
t² = 45/4.9
Take the square root of both side
t = √(45/4.9)
t = 3.03 s
Finally, we shall determine the velocity with which the ball hits the ground. This is illustrated below:
Initial velocity (u) = 0 m/s
Acceleration due to gravity (g) = 9.8 m/s²
Time (t) = 3.03 s
Final velocity (v) =.?
v = u + gt
v = 0 + (9.8 × 3.03)
v = 0 + 29.694
v = 29.694 ≈ 29.69 m/s
Therefore, the ball hits the ground with a velocity of 29.69 m/s.
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.
Which of the following would be considered a lever?
a screw cap
a seesaw
an axe
a windmill
Answer:
A seesaw
Explanation:
Answer:
a seesaw
Explanation:
He sees a mouse sniffing along at 0.2 m/s but it hears and starts to scurry for safety. In just 4.7 s it speeds up to 1.6 m/s. Find its acceleration.
Answer:
0.30 m/s²
Explanation:
Given:
v₀ = 0.2 m/s
v = 1.6 m/s
t = 4.7 s
Find: a
a = (v − v₀) / t
a = (1.6 m/s − 0.2 m/s) / 4.7 s
a = 0.30 m/s²
A construction worker drops a brick off a high scaffold. If the brick lands 5.0 s later, how fast was the brick travelling the instant before hitting the ground?
Answer:
The brick was traveling at 49 m/s the instant before hitting the ground.
Explanation:
When an object is dropped from rest in a free-falling motion, it falls with a constant acceleration called the acceleration of gravity, which value is [tex]g = 9.8 m/s^2[/tex].
The final velocity of a free-falling object after a time t is given by:
[tex]vf=g.t[/tex]
The distance traveled by a dropped object is:
[tex]\displaystyle y=\frac{gt^2}{2}[/tex]
The brick takes 5 seconds to land from the high scaffold. The speed at which it lands is:
[tex]vf=9.8\cdot 5[/tex]
vf=49 m/s
The brick was traveling at 49 m/s the instant before hitting the ground.
A physical change is a change to the physical properties of a substance. This type of change does
not change the nature of the substance. *
Answer:
False
Explanation:
Explain the free motion of particles.
Answer:
D : An electron may act with either particle-like or wave-like characteristics.
Explanation:
This is the whole basis of the Schrödinger equation.
The other options are correct, but they do not state the dual nature of the electron.
Which mineral is commonly found in igneous rocks?
A. halite
B. feldspar
C. gypsum
D. talc
Answer:
d
Explanation:
if a big stone and a small stone is dropped simultaneously from the certain height. they fall together why??
Because it takes more force to accelerate a mass, and gravity exerts more force on a greater mass. So every object winds up with the same acceleration.
And THAT, of course, says that all objects in the same gravity will pick up the same speed in the same time, and fall the same distance in the same time.
Compute for the total mechanical energy of a 3.5 kg baseball dropped from a height of 3 meters moving at a speed of 10 m/s. NEED ASAP GRADE 8 SCIENCE TY IN ADVANCE :))
Mechanical energy = Kinetic Energy + Potential Energy
Kinetic Energy :Kinetic energy = 1/2 * m * v² = 1/2 * 3.5 * (10)²
=> Kinetic energy = 175 J
Potential Energy :Potential energy = m * g * h = 3.5 * 10 * 3 = 105 J
Hence,
Mechanical energy = Kinetic Energy + Potential Energy
= 175 J + 105 J
= 280 J
Taking into account the potencial, kinetic and mechanical energy, the total mechanical energy is 278.005 J.
Potencial energyPotential energy refers to the position that a mass occupies in space and its magnitude is directly proportional to the height at which the object is, with respect to a reference position, to the mass of the object and to gravity:
Ep = m×g×h
Kinetic energyOn the other hand, kinetic energy manifests itself when bodies move and is associated with speed. The kinetic energy of a body depends on its mass and the square of its speed:
Ec = [tex]\frac{1}{2}[/tex]×m×v²
Mechanical energyThe mechanical energy of a body is the capacity it has to carry out mechanical work, that is, to produce a movement due to causes of mechanical origin, such as its position or its speed.
The mechanical energy of a body is the sum of its kinetic energy and its potential energy:
Em = Ep + Ec
Where
Em is the mechanical energy (J).Ep the potential energy (J). Ec the kinetic energy (J).Then:
Em= m×g×h + [tex]\frac{1}{2}[/tex]×m×v²
Principle of conservation of mechanical energyThe Principle of conservation of mechanical energy indicates that, in the absence of friction and without the intervention of any external work, the sum of the kinetic and potential energies remains constant, that is, the mechanical energy of a body remains constant throughout the movement. if no friction force acts.
This caseIn this case, you know that:
m= 3.5 kgg= 9.81 [tex]\frac{m}{s^{2} }[/tex]h= 3 mv= 10 [tex]\frac{m}{s}[/tex]Complying with the Principle of Conservation of Mechanical Energy and replacing in the expression of mechanical energy:
Em= 3.5 kg×9.81 [tex]\frac{m}{s^{2} }[/tex]×3 m + [tex]\frac{1}{2}[/tex]×3.5 kg×(10 [tex]\frac{m}{s}[/tex])²
Solving:
Em=103.005 J + 175 J
Em= 278.005 J
Finally, the total mechanical energy is 278.005 J.
Learn more:
https://brainly.com/question/3736007?referrer=searchResultshttps://brainly.com/question/13824832?referrer=searchResultshttps://brainly.com/question/6536722https://brainly.com/question/10770261
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
I need help for this displacement question.
Answer:
577656.0
Explanation:
What keeps the sun shining
Answer:
The Sun shines by turning hydrogen into helium in its core.
Explanation:
This process is called nuclear fusion. Fusion happens when lighter elements are forced together to become heavier elements. When this happens, a tremendous amount of energy is created.
2. Floyd Beattie set an unofficial speed record for a Floyd Beattie set an unofficial speed record for a unicycle in 1986. He rode the unicycle through a 200
m speed trap and accelerated at a constant rate along the speed trap, so that his initial speed was 9.78
m/s and his final speed was 10.22 m/s. What would the magnitude of his acceleration have been?
Answer:
0.022m/s²Explanation:
Given
v = 10.22m/s
u = 9.78m/s
S = 200m
Using the equation of motion'
v² = u² + 2aS
v is the final velocity
u is the initial velocity
a is the acceleration
S is the displacement
Substitute the given parameters into the formula:
10.22² = 9.78² + 2a(200)
104.4484 = 95.6484 + 400a
400a = 104.4484 -95.6484
400a = 8.8
a = 8.8/400
a = 0.022m/s²
Hence the magnitude of his acceleration would have been 0.022m/s²
For sediment to be transformed into rock, which set of processes must take place?
crystallization and solidification
weathering and erosion
compaction and cementation
melting and spreading
Answer:
C. compactation and cementation or A. crystallization and solidification
Explanation:
Answer:
i think its a sorry if im whrong and good luck! :)
How long will it take to travel 84 miles if
you are traveling at a constant 70 miles
per hour?
quick omg ‼️ please
Answer:
The answer is 1.2 hoursExplanation:
To find the time taken given the velocity and distance covered we use the formula
[tex]t = \frac{d}{v} \\ [/tex]
where
t is the time
d is the distance covered
v is the velocity
From the question
d = 84 mi
v = 70 mi/h
We have
[tex]d = \frac{84}{70} = \frac{6}{5} \\ [/tex]
We have the final answer as
1.2 hoursHope this helps you
2. Which of the following is NOT a possible source of Earth's magnetic field?
A. sun's magnetic field
c. magnetosphere
b. moon's magnetic field
d. Earth's core
Answer:
c.) magnetosphere
Explanation:
I think is C
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.
A box has a mass 40 kg
what is the weight of box ????
Answer:
mass = 40 kg
g = 9.8 m/s²
weight = mg
= 40 x 9.8
= 392 N
A charge of - 4.0 µC is located at the origin and a charge of - 5.0 µC is located along the y-axis at y = 2.0 m. At what point along the y-axis is the electric field zero?
I got y = 0.94427191 and y = -16.944272. Not sure if right tho.
I did [tex]{k q_1 \over y^2} &= {k q_2 \over (2-y)^2}[/tex], put the known in and solved it.
A.they are farther apart
B.they have increased in size
C.they have lost energy
D.they are moving slower
Answer:
c
Explanation:
What is the mass of a bowling ball if a 48 Newton force is accelerating the bowling ball
3m/s22
16 kg
0 45 kg
51 kg
144 kg
Next
Answer: The answer is 16Kg
Explanation:If you use the formula for mass, mass=force/acceleration and plug the numbers into the formula, 48/3 you would get
16Kg
To win the game, a place kicker must kick a football from a point 21 m (22.9656 yd) from the goal, and the ball must clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 16 m/s at an angle of 55.3◦ from the horizontal. The acceleration of gravity is 9.8 m/s^2 By how much vertical distance does the ball clear the crossbar? Answer in units of m
In projectile horizontal distance is given by :
[tex]h = \dfrac{u^2sin^ 2\theta}{2g}[/tex]
Putting all given values, we get :
[tex]h = \dfrac{u^2sin^ 2\theta}{2g}\\\\h=\dfrac{16^2\times sin^2 \ 55.3^o}{2\times 9.8}\\\\h=13.1\ m[/tex]
Therefore, maximum height of football is 13.1 m.
Hence, this is the required solution.
Here’s another one :(