Answer:
Work done = 80 gm/s
Explanation:
Given:
Final velocity (v) = 4 m/s
Initial velocity (u) = 0 m/s
Mass of ball (m) = 40 g
Find:
Work done.
Computation:
Using work energy rule
Work done = Change in kinetic energy
Work done = 1/2[mv-mu]
Work done = 1/2[(40)(4) - (40)(0)]
Work done = 1/2[(40)(4)]
Work done = 80 gm/s
I really need help so heres the question: "A 100 watt lightbulb is on for 2 hours a day" What is the energy in watt-hour (Wh) it consumes per day?
Answer:
Explanation:
You have to assume the lightbulb consumes 100 watts of power. If it gives off 100 watts equivalent of light, you cannot solve the problem.
W = 100 watts
T = 2 hours
Energy = W * h
Energy = 100 * 2
Energy = 200 watt*hours
What are the materials necessary to create an electromagnet?
A) power source, metallic core, and electrical conductor
B) metallic core and power source only
C)metallic core magnet, and power source
D)electrical conductor and power source only
Answer:
A
Explanation:
Electromagnet: It is a temporary magnet. It consists of wrapping coils around iron core and the power source. When the current passes through the coils around the iron core then it will get magnetized. The domains of the electromagnet gets aligned.
As long as the current passes through it, it will get magnetized. It will loose its magnetism easily when the power is switched off.
In the electromagnet, the strength of the magnetism can be increased or decreased. The poles of the electromagnet are not fixed.
Explain why It takes longer to heat a cinema to the same temperature as a house.
Sa se calculeze caldura degajata de un fier de calcat dace este alimentat la 220v si este parcurs de un curent electric de 100 a. Se stie ca acesta functioneaza 25 de min
Answer
33,000,000 joules or 33MJ
Explanation:
The formula for calculating the heat released by a substance is expressed as shown below;
where;
Q is the amount of heat released
p is the power expended
t is the time it takes
[tex]Since P = current * voltage\\P = IV[/tex]
Then;
[tex]Q = IVt[/tex]
Given the current I = 100A, supply voltage V = 220V and required time t = 25mins
t = 25 * 60 = 1500 seconds
Substituting these values in the formula that we have;
[tex]Q = 100 * 220 * 1500\\Q = 22000*1500\\Q = 33,000,000Joules\ or\ 33MJ[/tex]
The law of conservation of energy states
Which change will increase the speed of a sound wave traveling in a solid aluminum rod?
Answer:
Increasing the temperature of the rod
Explanation:
Which statement best describes the movement of particles when a wave travels through a medium?
Answer:
The particles of the medium just vibrate in place. Particles of the medium don’t actually travel along with the wave. Only the energy of the wave travels through the medium.
Explanation:
If a sound travels 343m/s through air and has a frequency of 800Hz, what would the wavelength be of the same sound traveling through water 500m/s with the same frequency?
Answer:
0.625m
Explanation:
Now Velocity of a wave ,V = frequency × wavelength
Wavelength =velocity /frequency
=500/800 =0.625m
~Fast-moving currents of air that occur above the friction layer are called?
mesocyclone
wind trains
chinooks
jet streams
Answer:
the answer is jet stream [100%] sure
two current carrying wires are placed next to each other. Their currents are moving in the same direction. Suggest why each wire experiences a force
When there are two currents flowing in opposite direction the magnetic field are moving in the same directions. When the currents flow in the same direction the magnetic field will be opposite, causing the wires to attract.
Carlotta makes a graphic organizer about the steps of the Sun’s hydrogen fusion process. A venn diagram of 3 intersecting circles with one circle labeled step 1, a second circle labeled step 2 and the third labeled step 3. There is a V in the step 1 circle. There is a Z in the step 3 circle. There is a W in the intersecting circle between step 1 and step 2. There is a Y in the intersecting section between step 2 and step 3. There is an X in the intersecting area of all 3 circles. She wants to add three labels. Label 1: is a reactant. Label 2: Energy is released. Label 3: Helium is produced. What is the best placement of the labels? Label 1 in region V. Label 2 in region X. Label 3 in region Z. Label 1 in region W. Label 2 in region Y. Label 3 in region Z. Label 1 in region W. Label 2 in region X. Label 3 in region Y. Label 1 in region V. Label 2 in region Z. Label 3 in region Y.
Answer:
label 1:w
label 2: x
label 3:y
Explanation:
you should add me on sp annabell_aaaa
Answer:
w,x,y
Explanation:
i did it on edg
help......,.........................
Answer:
Explanation:
R1= (1/6 + 1/6)rised to -1 = 3 ohm
R total = R1 + 6 = 3+ 6 = 9 ohm
An object has a kinetic energy of 35j and a mass of 24j kg,how fast is the object moving?
Answer:
v = 1.7 m/s
Explanation:
We have,
The kinetic energy of the object is 35 J
Mass of the object is 24 kg
It is required to find the speed of the object. If v is the velocity, then kinetic energy is given by :
[tex]E=\dfrac{1}{2}mv^2[/tex]
or
[tex]v=\sqrt{\dfrac{2E}{m}} \\\\v=\sqrt{\dfrac{2\times 35}{24}} \\\\v=1.7\ m/s[/tex]
So, the speed of the object is 1.7 m/s.
ANSWER ASAP!!!If a wave machine produces 10 waves in 2 seconds, what is the frequency of the machine in Hertz?
Answer:
5Hz
Explanation:
Frequency = No. of waves per second
10 waves are produced in 2 seconds
in one second 10/2 waves are produced
(ie) 5 waves are produced in 1 second
Therefore the frequency of wave is 5 Hz
The differences between microwaves and infrared radiation are due to differences in their _____.
A 25 V battery is connected into a circuit with two resistors in series. One resistor has resistance 5.0 Ω and the other has resistance 7.5 Ω. What is the voltage drop across the 7.5 Ω resistor?
Answer:
15 V
Explanation:
From the question,
For series connection: (i) Both resistor have a common current flowing through the (ii) The combined resistance = R1+R2
Rt = R1+R2.................. Equation 1
Given: R1 = 5 ohms, R2 = 7.5 ohms.
Rt = 5+7.5 = 12.5 ohms.
Applying Ohm's law,
V = IRt................... Equation 2
Where V = Voltage, I = current.
make I The subject of the equation
I = V/Rt.............. Equation 3
Given: V = 25 V, Rt = 12.5 ohms.
Substitute into equation 3
I = 25/12.5
I = 2 A.
Now,
Voltage drop across the 7.5 ohms resistor = R2×I
Voltage drop across the 7.5 ohms resistor = 7.5×2
Voltage drop across the 7.5 ohms resistor = 15 V
What is "In an isolated system two cars, each with a mass of 2,000 kg, collide. Car 1 is initially at rest , while car 2 was moving at 20 m/s. what is their combined momentum after the collision?"
Answer:
Final velocity of the combining cars = 10m/s
combined momentum = 40000kgm/s
Explanation:
Given the following :
Mass of both colliding cars = 2000kg
Initial Velocity of car 1 (U1) = 0
Initial Velocity of car 2 (U2) = 20m/s
Combuned momentum after collision =?
This is an inelastic collision which is calculated thus :
M1U1 + M2U2 = M1V + M2V
M1U1 + M2U2 = (M1 + M2) V
Where V = "final Velocity of the colliding bodies
2000 × 0 + 2000 × 20 = (2000 + 2000) V
0 + 40000 = 4000V
V = 40000 / 4000
V = 10m/s
Therefore combined momentum = (M1 + M2) V
(2000 + 2000) 10
4000(10) = 40000kgm/s
what is meant by tyndall effect? in point wise with example.
Answer:
scattering of light
Explanation:
is the scattering of light as a light beam passes through a colloid. The individual suspension particles scatter and reflect light, making the beam visible. ...
A 24 resistor, an inductor with a reactance of 12 , and a capacitor with a reactance of 10 are in series across a 60 V 50 Hz source. Calculate the voltage across the inductor.
Answer:
A⋅24=24A
12=24A
10=24A
a⋅(60V)⋅(50Hz)=3000aVHz
Explanation:
a bike travels 4 miles in half an hour, what is its speed?
Answer:
8 mph
Explanation:
4 miles in half hour so you add 4 more for the second half
A 5.0 V battery contains 775 C of charge. How much electricity energy can it produce?
Answer:
3875J
Explanation:
Energy is defined as the power × time
And it's defined as
Power = IV - I- current and V- voltage
Now quantity of electricity; Q = I × t
Where I is current and t is time
Now Energy = I ×V×t = V× I×t = V× Q;
where Q is quantity of electricity 775C and V is 5.0volt
Hence 775 × (5) =3875J
April sits at rest on a skateboard. She has a mass of 65 kg. Her friend throws
her a suitcase (m= 15 kg) at a speed of 3 m/s. If she catches it, how fast will
she, the skateboard, and the suitcase move?
Answer:
[tex]Velocity = 0.5625m/s[/tex]
Explanation:
Given
Represent mass of April with M and mass of the suitcase with m; such that
[tex]M = 65kg[/tex]
[tex]m = 15kg[/tex]
Represent initial velocity of April with U and initial velocity of the suitcase with u; such that
[tex]U = 0m/s[/tex] (because she's resting on the skateboard, initially)
[tex]u = 3m/s[/tex]
After she catches the suitcase, she, the skateboard and the suitcase moves at the same velocity.
Represent this velocity with v
The above given information can be representing using law of conservation of momentum.
[tex]MU + mu = (M + m)v[/tex]
Substitute the values of M,U, m and u.
This gives
[tex]65 * 0 + 15 * 3 = (65 + 15)v[/tex]
[tex]0 + 45 = (80)v[/tex]
[tex]45 = 80v[/tex]
Divide both sides by 80
[tex]\frac{45}{80} = \frac{80v}{80}[/tex]
[tex]0.5625 = v[/tex]
Hence, they moved at a velocity of 0.5625m/s
What is the magnetic force on a 200 cm length of (straight) wire carrying a current of 30 A in a region where a uniform magnetic field has a magnitude of 0.055 T and is directed at an angle of 20 away from the wire
Answer:
F = 0.112 N
Explanation:
To find the magnitude of magnetic force on the wire, you use the following formula:
[tex]|\vec{F}|=|i\vec{L}\ X\ \vec{B}|=iLBsin\theta[/tex] (1)
L: length of the wire = 200cm = 0.2m
i: current in the wire = 30 A
B: magnitude of the magnetic field = 0.055 T
θ: angle between the directions of L and B = 20°
You replace the values of L, i, B and θ in the equation (1):
[tex]|\vec{F}|=(30A)(0.2m)(0.055T)sin(20\°)=0.112N[/tex]
hence, the magnetic force on teh wire is 0.112N
An 80 kg skateboarder moving at 3 m/s pushes off with her back foot to move faster. If her velocity increases to 5 m/s, what is her change in kinetic energy as a result? J How much work did she perform? J
Answer:
640 J
Explanation:
ΔKE = KE − KE₀
ΔKE = ½ mv² − ½ mv₀²
ΔKE = ½ m (v² − v₀²)
ΔKE = ½ (80 kg) ((5 m/s)² − (3 m/s)²)
ΔKE = 640 J
Her kinetic energy increases by 640 J, so she does 640 J of work.
It's 640 for both answers. :)
The pressure of a gas is affected by what two things?
a. Quantity and Temperature
b. Pressure and Temperature
c. Quantity and Pressure.
d. Pressure and Height
Answer:
the correct answer is,
a. Quantity and Temperature
Answer:
B
Explanation:
pressure because, if the volume increases the pressure decreases.
Temperature because, if its hot molecules will be farther apart and if its cold molecules wil be tightly together
pls mark me brainliest
Covalent bonds are formed between .....
non-metal and non-metal
two or more nonmetals
metals and metals
Answer:
Non metal and nonmetal
Explanation:
Covalent bonds are formed between non-metal and non-metal
Hope this helps...
how much work is done by a force of 20N while moving an object through distance 10 m of the force
Answer:
200 J
Explanation:
Work = Force × Distance
Work = (20 N)(10 m) = 200 N·m = 200 J
200 joules of work are done by a force of 20 N over a distance of 10 m.
Jalen combines two substances in science class. Once combined, only one of the two substances
is visible. When he placed this combination into a filter, substance 1 stayed in the filter while
substance 2 went through it. Which of the following claims regarding Jalen's combination is the
most accurate?
a. This combination is not a mixture because he cannot see one of the substances.
b. The combination is a mixture because the substances can be separated.
c. The combination is not a mixture because the substances can be separated.
d. The combination is a mixture only because he cannot see one of the substances,
Answer: b. The combination is a mixture because the substances can be separated
Explanation: Based on the facts presented above, the combination of both both substances can be referred to as a mixture due to the following:
A mixture is obtained when two or more substances or materials are combined without a chemical reaction. This is observed when Jalen combined substance 1 and 2 with only one of the substances becoming visible after the combination.
The other reason is that, a mixture can be separated back into its original constituent, this is evident when the combination was filtered with only substance 2 going through the filter and substance 1 remaining in the filter
Find the prime factorization of 168.
Answer:
2 x 2 x 2 x 3 x 7 = 168
Explanation:
Prime factors of 168: 2, 3 and 7
These are the factors of 168: 1,2,3,4,6,7,8,12,14,21,24,28,42,56,84,168. Only 2, 3 and 7 are prime numbers meaning that they are only divisible by themselves and 1. Therefore they are the prime factors.
Answer:
Prime factors of 168: 2, 3 and 7
A 20 cm
B 15 cm
C 10 cm
D 5 cm
E 0 cm
If potential energy at point A is 12 joules, what is the potential energy at C?
Answer:
4.8.
Explanation
A body is moving vertically upwards. It’s velocity changes at a constant rate from 50m/s to 20m/s in 3 sec. What is it’s acceleration ?
Answer:
-10 m/s²
Explanation:
a = Δv / Δt
a = (20 m/s − 50 m/s) / 3 s
a = -10 m/s²
Answer 10 m/s²
Explanation:
a = Δv / Δt
a = (20 m/s − 50 m/s) / 3 s
a = -10 m/s²
Explanation:
