About 40,000 J of energy is stored in a typical 1.5-V D-cell battery. If two such batteries are joined to produce a total of 3.0 V in a flashlight circuit and cause 2.0 A of current to flow through the flashlight bulb, how long will the batteries be able to deliver power to the flashlight at this level?
URGENT PLS HELP
Answer:
Time = 13333.33 s = 222.22 min = 3.7 h
Explanation:
The total amount of energy in two cells combined will be:
[tex]Total\ Energy = 40000\ J + 40000\ J\\Total\ Energy = 80000\ J\\[/tex]
Now, we calculate the power of the batteries:
[tex]Power = (Voltage)(Current)\\Power = (3\ V)(2\ A)\\Power = 6\ Watt[/tex]
Now, we use the following formula to calculate the time the batteries will be able to deliver the power to the flashlight:
[tex]Total\ Energy = (Power)(Time)\\\\Time = \frac{Total\ Energy}{Power}\\\\Time = \frac{80000\ J}{6\ Watt}[/tex]
Time = 13333.33 s = 222.22 min = 3.7 h
A bobsled is on an inclined sheet of ice that is frictionless. What must be the angle of the incline if the acceleration of the bobsled is 2.77m/s^2?
Answer:
θ = 73.6º
Explanation:
To solve this exercise, let's use Newton's second law. Let's set a reference system where the x-axis is parallel to the inclined plane
with trigonometry we can find the components of the weight
sin θ = Wₓ / W
cos θ= W_y / W
Wₓ = W sin θ
W_ = W cos θ
Y axis
N - W_y = 0
N = W_y
X axis
Wₓ - fr = m a
mg cos θ - fr = m a
indicate that friction is zero, fr = 0
cos θ = a / g
θ = cos⁻¹ [tex]\frac{a}{g}[/tex]
let's calculate
θ = cos⁻¹ [tex]\frac{2.77}{9.8}[/tex]
θ = 73.6º
A 0.17 kg softball moving at 30 m/s is caught by a player. If the average force on the
player's hands during the catch is 500 N, find the time in which the ball came to a stop.
Answer:
0.35
Explanation:
ur dogwater
distinguish between speed and velocity
Speed has no direction.
Velocity has one.
A boy pushes his baby sister on a swing in the playground. At the top
of the baby's path, she has a potential energy of 200 J.
How much potential energy will she have at the bottom of her path?
How much kinetic energy will she have at the bottom of her path?
Answer:
* If there is no friction U = 0, K = 200 J
* If there is friction U = 0, K = 200 - W
Explanation:
For this exercise we must make an assumption.
* If there is no friction
The energy of the system is conserved therefore the energy is transformed.
The potential energy is
U = m g h
at the bottom of the road there is no height therefore
U = 0
and all the energy has been transformed into kinetic energy
K = 200 J
* If there is friction, which can come from the internal friction of the car, the friction force between the car and the floor, etc.
in this case there is a loss of energy due to the work of non-conservative forces (friction).
The potential energy at the bottom of the path is hedron because there is no height U = 0
The kinetic energy is
K = U -W
K = 200 - W
where W is the work of the friction force.
Displacement is used to measure
A.
weight
B.
mass
C.
distance
D.
volume
Answer:
D. Volume
Hope this helped <3
Because fluid pressure increases witj depth, there is more fluid pressure_____ of a submerged object than on the ____
Answer:
Because fluid pressure increases with depth, there is more fluid pressure___outside__ of a submerged object than on the _inside___
Explanation:
As the object is submerged means that it is under water and not on the surface. It tells that water pressure exerting on the object from the outside is higher than inside which is why the object is submerged.
In the other case, the object will not remain submerged if its internal pressure is high, it will float on water.
What is the direction of the magnetic force on a positive charge if:
1. V= downward; B= out of the page
2. V=upward; B=right
3. V=right; B=into the page
4. V=into the page; B=upward
5. V=out of the page; B=left
Explanation:
1) left ⬅️
2) into the page
3) upward ⬆️
4) right ➡️
5) downward ⬇️
how are a grassland ecosystem and a pond ecosystem connected?
Answer:
terrestrial ecosystem and pond ecosystem is an aquatic ecosytem, hence both their abiotic and biotic components would be different.
Explanation:
A body falling freely on the moon the acceleration due to gravity there is 1.7 m/s2.
a. its displacement at t = 3s
b. the time for it to reach a speed of 25 m/s
c. the time required for it to fall 300 m
d. its speed after falling 70 m
Answer:
a) 7.65 m
b) 14.71s
C) 15.43 m/s
Explanation:
a) s = ut + 0.5at²
s= ?
u = 0
t = 3s
a = 1.7 m/s²
s = 0 + 0.5 × 1.7 × 3²
s = 7.65 m
b) v = u + at
v = 25m/s
u = 0 m/s
a = 1.7 m/s ²
t = ?
v=at
t = v / a
t = 25 / 1.7
t = 14.71s
c) v² = u² + 2as
s = 70m
a = 1.7m/s²
u = 0 m/s
v = ?
v² = 2as
v = √238
v = 15.43 m/s
A girl who is watching a plane fly tells her friend that the plane isn't moving at all. Describe a frame of reference in which the girl's description would be true.
The girl's reference frame must be moving with the same speed as the plane.
If an observer is stationary and he watches a car moving he can observe that the car has a momentum and is moving with certain speed. But if the observer is in the car or moving with same speed, the car does not appear to move away form the observer. Likewise, two observers moving with different speed will have different observation about the same car.
Similarly, if the girl describes the plane is not moving that means either she is in the plane or moving with the same speed along with the plane.
Learn more about frame of reference:
https://brainly.com/question/20897534
Glasses, cameras, flashlights, binoculars, telescopes and peepholes are all made using_lenses.
les ))
Answer:
convex
Explanation:
hope you have a good day!
Two in-phase sources of waves are separated by a distance of 3.50 m. These sources produce identical waves that have a wavelength of 5.96 m. On the line between them, there are two places at which the same type of interference occurs (a) Is it constructive or destructive interference, and (b) where are the places located?
Answer:
(a) It is a destructive interference
(b) The places at which destructive interference occur on the line between the two in-phase sources, are 1.07798 m before and after the two sources
Explanation:
(a) The given parameters are;
The distance between the two in-phase sources, d = 3.50 m
The type of waves produced by the two sources = identical waves
The wavelength of the waves produced by the two sources, λ = 5.96 m
For constructive interference, we have;
d·sin(θ) = m·λ
Where, m = 0, 1, -1, 2, -2, ...
For destructive interference, we have;
[tex]d \cdot sin(\theta) = \left(m + \dfrac{1}{2} \right) \cdot \lambda[/tex]
d·sin(θ) = Δl =
Where, m = 0, 1, -1, 2, -2, ...
Therefore, given that λ > d, for constructive interference
sin(θ) = m·λ/d > 1 for m > 0 which is invalid as the maximum value for sin(θ) = 1
Therefore, the possible interference is destructive interference
(b) For destructive interference, when m = 0, we have;
[tex]3.5 \times sin(\theta) = \left(0 + \dfrac{1}{2} \right) \times 5.96[/tex]
∴ sin(θ) = (5.96/2)/3.5
θ = arcsin((5.96/2)/3.5)
By trigonometry, we have;
tan(θ) = (d/2)/l
Where
l = The location along the line
∴ l = (d/2)/(tan(θ))
By substitution, we have;
l = (3.5/2)/(tan(arcsin((5.96/2)/3.5))) = 1.07798
Therefore, the two locations along the line where there is a destructive are 1.07798 m along the line before and after the two in-phase sources.
The relationship between body mass body weight and body density
Answer:
The formula for calculating Density is:
= Mass / Volume
From this formula, we can say that the relationship between Mass and Density is a direct one. In other words, if mass is increasing - all else being equal - then density will increase as well.
If mass however was decreasing, density would have to decrease as well.
For example, assume 3 bricks have masses of 5kg, 10kg and 15kg. Also assume that the bricks all have the same volume of 5 m³.
Density of 5kg brick = 5 / 5 = 1 kg/m³
Density of 10kg brick = 10 / 5 = 2kg / m³
Density of 15kg brick = 15 / 5 = 3 kg /m³
Notice how density increases as mass increases and decreases when mass decreases.
Two identical charges exert a force of 4.5 x 10-2 N and each have charges of 2.5 x 10-6 C, what is the radius?
1.18 x 10-5 m
1.12 m
1.25 m
707.11 m
State advantages and disadvantages of expansion of solid
Answer:
One of the most useful use of expansion by heat is for switches on many types of machinery and home appliances Thermostats in the millions of cars are operated by using the expansion of metal Thermometers are another example,
The disadvantages are just as common Railway lines need free movement d will buckle without sufficient clearance. Internal combustion engines need to be designed to allow for expansion and contraction of metal parts
Analyze the data from Data Table 2. As the mass of an object doubles, its kinetic energy
1. is halved
2. doubled
3. quadrupled
4. does not change
Answer: 2- doubled
Explanation:
Given
for m=0.02 kg, v=5 m/s, kinetic energy is 0.25 J
for same velocity and double mass i.e.
m=0.04 kg, v=5 m/s, kinetic energy is 0.50 J
same is with
m=0.08 kg, v=5 m/s , kinetic energy is double to [tex]2\times 0.5=1\ J[/tex]
So, on doubling the mass, kinetic energy is doubled
Which would have more volume, 1 kg of lead or 1 kg of copper? And EXPLAIN how you can tell.
Pls answer this ASAP for 15 points
* science*Name the two types of neutron stars.
Answer:
Radio pulsars and Recycled pulsars
A lifeguard on a beach observes that waves have a speed of 2.60 m/s and a distance of 2.50 m between wave crests. What is the period of the wave motion? Please show all work. (ref: p.382-387)
Answer:
T = 0.96 seconds
Explanation:
Given that,
The speed of wave, v = 2.6 m/s
The distance between wave crests, [tex]\lambda=2.5\ m[/tex]
We need to find the period of the wave motion. Let T be the period. So,
[tex]v=\dfrac{\lambda}{T}\\\\T=\dfrac{\lambda}{v}\\\\T=\dfrac{2.5}{2.6}\\\\T=0.96\ s[/tex]
So, the period of the wave motion is equal to 0.96 seconds.
The period of the wave motion is 0.96 seconds. Using the formula:
v = λ / T
where v is the velocity of the wave, λ is the wavelength and T is the period of the wave.
Given that v = 2.60 m/s, λ = 2.5 m, hence:
2.6 = 2.5/T
T = 0.96 s
The period of the wave motion is 0.96 seconds.
Find out more on period at: https://brainly.com/question/10843932
Which statement about the mass of a falling object is correct? A.It decreases as the object falls. B.It increases as the object falls. C.It is equal to the weight of the object. D.It stays the same as the object falls.
Answer:
D.It stays the same as the object falls.
How does a resistor affect an electrical circuit?
Answer:
D
Explanation:
Answer:
D.
It reduces the rate at which electrons flow.
Consider a projectile. Which of the following describes y-motion? Check all that apply.
1. The y motion is a vertical motion.
2. The y motion is a horizontal motion
3. A projectile covers different distances per second in the direction.
4. A projectile covers equal distance per second in this direction
Answer:
1. True - gravity affects the y motion
2. False - x-coordinates affect the horizontal motion
3. y because gravity affects motion in the y-direction
4. x generally no external forces act in the x direction and hence no acceleration in the x direction
3) El motor de una moto le imprime una velocidad de 90 km/h al aplicar sobre ella una fuerza de 240 N. ¿Cuál es la potencia de la moto en vatios?
Answer:
P = 6000 W
Explanation:
The given question is "The motor of a motorcycle gives it a speed of 90 km / h when a force of 240 N is applied to it. What is the power of the motorcycle in watts?"
Given that,
Speed of a motorcycle, v = 90 km/h = 25 m/s
Force applied to the motorcycle, F = 240 N
We need to find the power of the motorcycle. We know that,
Power = Fv
So,
P = 240 N × 25 m/s
= 6000 W
So, the required power of the motorcycle is equal to 6000 W.
Can you help me please?
Answer:
a/ oscillating charges
How many charges do copper(II) and Carbide have?
Answer:They have 10
Explanation:
how is the flow of air important in designing the shape of a car?
Answer:
Explanation:
The more aerodynamic a vehicle is the less wind resistance there is meaning there is better gas mileage because it dont have to push so hard against wind and it also helps with the eye appeal
Once a player has stopped dribbling, how many steps are they allowed to take at maximum?
Answer:
2 steps
Explanation:
:)
this makes basketball interesting
Answer:
2 steps tops. If it is more that is called "traveling".
Explanation:
How much force is needed to accelerate a 7.1 kg skier at 4 m/s/s?
Answer: 28.4
Explanation:
F=MA
F=(7.1)(4)
F= 28.4 N
What is the specific heat capacity of silver metal if 32.0 kg of the metal absorbs 55.0 J of heat and the temperature rises 21.0 C?
Answer:
Specific heat capacity of silver metal = 0.08184 J/kg°C
Explanation:
Given:
Mass of silver metal = 32 kg
Change in thermal energy = 55 J
Change in temperature = 21°C
Find:
Specific heat capacity of silver metal
Computation:
Using Specific heat capacity formula
C = ΔE / mΔT
where;
C = Specific heat capacity
ΔE = Change in thermal energy
m = Mass
ΔT = Change in temperature
C = (55) / (32)(21)
Specific heat capacity of silver metal = 55 / 672
Specific heat capacity of silver metal = 0.08184 J/kg°C