Answer:
P=F/A =mg/A =pvg/A = pgh
Explanation:
pressure equals force per unit area.
force also equals mass ×gravity
mass can also be density ×volume
volume can also be area × height
area would cancel out the area
leaving pgh
Rosita started riding her bike 3 km to her friend Gena’s place at exactly the same time Gena started skating to Rosita’s house. Gena, of course, wasn’t home, so Rosita rode back home. The two girls arrived at Rosita’s house at the same time. It took Rosita 30 minutes to ride to Gena’s and back. How fast did Gena skate?
Answer:
6km/hr
Explanation:
Lets make a chart
R. G
D 6km. 6 /2=3km
S. 6/1/1= 12 km/h. 6km/h= 3/1/2
T 1/2hr 1/2hr
so 6km/hr hope that helps if it does please mark as brainliest.
What do seismic waves and sound waves have in common?
HELP ASAP PLS
A locomotive with a rocket engine is being tested on a smooth horizontal track. The mass of the
locomotive is unknown. Starting from rest, the engines are fired for 20 s. During this time
they expel 500 kg of oxidized kerosene. The kerosene particles are expelled at an average
velocity of 1200 m/s. At the end of the 20-s period the speed of the locomotive is 50 m/s.
What is its mass?
Answer:
The mass of the locomotive is 288,000 kg
Explanation:
The question relates to the law of conservation of energy
The given parameters are;
The form of engine on the locomotive = Rocket engine
The mass of the locomotive = m
The initial velocity of the locomotive, v = 0 m/s
The duration at which the engine is fired = 20 s
The mass of the kerosene expelled, m₁ = 500 kg
The average speed with which the kerosene is expelled, v₁ = 1,200 m/s
The final speed of the locomotive engine after 20-s, v₂ = 50 m/s
Kinetic energy, K.E. = 1/2·m·v²
The total kinetic energy of the kerosene particles, K.E.[tex]_k[/tex] = 1/2 × 500 × 1,200² = 360,000,000
∴ K.E.[tex]_k[/tex] = 360,000,000 J
By the conservation of energy, the kinetic energy of the expelled kerosene particles is equal to the kinetic energy gained by the moving locomotive
Therefore, we have;
K.E.[tex]_L[/tex] = K.E.[tex]_k[/tex]
K.E.[tex]_L[/tex] = 1/2 × m × v₂² = 1/2 × m × 50²
∴ K.E.[tex]_L[/tex] = 1/2 × m × 50² = K.E.[tex]_k[/tex] = 360,000,000 J
1/2 × m × 50² = 360,000,000 J
m = 360,000,000 J/(1/2 × (50 m/s)²) = 288,000 kg
m = 288,000 kg
The mass of the locomotive, m = 288,000 kg
which of the following instrument measure time most accurately
a pendulum clock
b sundial
c quartz watches
d sand clock
1.) A projectile is launched at 32.1 m/s and 52.6 º above the horizontal. Determine the:
a.) Maximum height of the projectile.
b.) The time it takes to reach the maximum height
c.) Time of flight
d.) Range
Answer:
a.) Maximum height of the projectile. =32.5m
b.) The time it takes to reach the maximum height=2.6s
c.) Time of flight=2.6s
d.) Range=99.5m
Explanation:
Energy in an ecosystem's energy pyramid always flows from __________.
A. decomposers to producers
B. producers to consumers
C. consumers to producers
D. decomposers to consumers
The Answer is B because primary consumers need to get their food from plants.
Answer:
The Answer is B because primary consumers need to get their food from plants
Explanation:
pls help its due today
What is the velocity of a cup dropped from a building if it takes 8.8 seconds for the cup to hit the ground? (Gravity = -9.8 m/s2).
Answer: vf= 86.24
Explanation:
Basic physics kinematic problem right. So we assume if this is freefall the object or cup in this case is falling with an initial speed of zero and then starts to accelerate due to the force of gravity. First lets see what equations we should use:
Imma use
d=vi+vf/2*t
d=vi*t+ 1/2*a*t^2
First I will solve for distance just to make it easier for me to use the equations.
d= 0(initial speed)*8.8s+1/2*(9.8m/s^2)(8.8)^2 or just d=1/2*(9.8m/s^2)(8.8)^2
d= 379.456
Alright lets use this info in the next equation
379.456= 0 + vf / 2 *8.8 or 379.456= vf/2 *8.8= vf= 86.24m/s
The combination of all of the forces acting on an object is called the
A) total force.
B) union of forces.
C) super force.
D) net force.
Answer:
The combination of all of the forces acting on an object is called D. net force
Explanation:
What is the kinetic energy of a 2.1kg baseball and is traveling at 10 m/s?
Answer:
Explanation:
KE = 1/2mv^2
KE = 1/2(2.1)(10)^2
KE=105N
Need help as fast as possible please
I will mark BRAINLIST only for correct answers babes :)
Thank you!
Answer:
1) Image
2) virtual
i hope its right ! :)
Explanation:
A saw becomes warm when it is used to cut a log of wood.Give reason
Explanation:
a part of the kinetic energy of the sun is converted into heat as it cuts the log of wood it is due to this heat that becomes worm .Thus, kinetic energy of such changes into heat
Question 7 of 10
Which observation is evidence of refraction in this photo?
A. The top of the man's head appears disconnected from the rest of
his head.
B. The man's arm is clearly seen under the water.
C. The snorkel in the man's mouth appears yellow.
a
D. The water in which the man is swimming is transparent.
Answer: it is A
Explanation: A p e c
A skateboarder coasts a distance of 20 meters in 4 seconds. What is the person's speed?
Answer:
5 m/s
Explanation:
The formula of speed is : distance/time taken.
The skateboarder covered a distance of 20 meters in 4 seconds. So,
Distance = 20 meters
Time Taken = 4 seconds
Speed = 20/4 = 5 m/s
describe briefly the potential energy it has ( roller coaster)
Answer:
The energy that it starts with at the top of the inclinede Plane
Explanation:
Hope I helped:)
The type of energy that a moving object has that increases when the speed of that object increases and is called ____.
Answer:
no
Explanation:
Answer:
The answer is Kinetic Energy.
Explanation:
Kinetic energy basically means energy of mass that's in motion.
Most houses in the countries that experience winter have air heaters installed.These heaters are usually installed near the floor.Explain why.
Answer: because the air currents move upwards so the hot air fills up the whole room. Similarly if the air conditioner is placed neer the ceiling because it gives cool air
what do you call a material which is capable of reducing friction when applied between moving parts?
Answer:
The material is called a Lubricant.
Hope it helps! ☺️
Why does thunder come before lightning?
Answer:
That is because light travels much faster than sound waves. … It takes approximately 5 seconds for the sound to travel 1 mile.
Explanation:
If the thunder follows the lightning almost instantly, you know the lightning is too close for comfort.
how gumamela reproduced
What the energy transformation of an solar panel?
Answer:
The light energy from the sun causes the particles of the object to vibrate, transforming the light energy into heat energy. The heat energy is then radiated out as infrared light.
Explanation:
Can someone help with this? (Picture above)
Answer:
Element #1
protons = 1
neutrons = 0
electrons = 1
atomic number = 1
atomic mass = 1
Element #2
protons = 2
neutrons = 2
electrons = 2
atomic number = 2
atomic mass = 4
Element #3
protons = 3
neutrons = 3
electrons = 3
atomic number = 3
atomic mass = 6
Explanation:
Atomic mass = proton = electrons at neutral state
please give me brainliest if my answer is helpful
An incident ray traveling in a slower medium strikes a boundary with a faster medium. What happens when its angle of incidence is greater than the critical angle?
A.
The refracted ray makes an angle of 90°.
B.
There is total internal reflection in the faster medium.
C.
There is total internal reflection in the slower medium.
D.
The reflected ray makes an angle of 90°.
E.
The reflected ray makes an angle equal to the critical angle.
Answer:
D. The reflected ray makes an angle of 90°.
Explanation:
8. If Bulb 8 burns out, how will the remaining bulbs be affected?
1
2
3
4
5
6
7
8
5 kg dog accelerates at a rate of 3 m/s2. What is the net force acting on the dog?
A. 2 N
B. 15 N
C. 8 N
D. 1.5 N
Answer:
The answer would be C. 8 N
Explanation:
SOS: I completely forgot what net force is...
4. An egg is thrown horizontally off the roof that is 60 meters high, with an initial velocity of
6.5m/s. How long does it take to hit the ground? How far does it go in the x direction?
Answer:
It will take 3.5s to reach the ground
Explanation:
A protein-digesting enzyme when mixed with starch solution would
Answer:
It would produce fat..........
Activity: Is it the same?!
Reflection of light (and other forms of electromagnetic radiation) occurs when the waves encounter a surface or other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface. The simplest example of visible light reflection is the surface of a smooth pool of water, where incident light is reflected in an orderly manner to produce a clear image of the scenery surrounding the pool. Throw a rock into the pool (see Figure 1), and the water is perturbed to form waves, which disrupt the reflection by scattering the reflected light rays in all directions.
Some of the earliest accounts of light reflection originate from the ancient Greek mathematician Euclid, who conducted a series of experiments around 300 BC, and appears to have had a good understanding of how light is reflected. However, it wasn't until a millennium and a half later that the Arab scientist Alhazen proposed a law describing exactly what happens to a light ray when it strikes a smooth surface and then bounces off into space.
In this activity you will be working as an engineer that is working to modify different kinds of digital cameras and to study the effect of changing incident angle on the reflected angle.
Method
Explain the steps of your experiment and identify the scientific variables:
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
• Independent Variable
----------------------------------------------------------------------------------------------------------------
• Dependent Variable
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
if anyone does ib myp 3. pleaseeee helppp im gonnnnaaa fail.
sciences by concept myp 3 formative assesment.
im giving 50 points please just help meeeeeeeeeeee
Answer:r other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface. The simplest example of visible light reflection is the surface of a smooth pool of water, where incident light is reflected in an orderly manner to produce a clear image of the scenery surrounding the pool. Throw a rock into the pool (see Figure 1), and the water is perturbed to form waves, which disrupt the reflection by
Explanation:
Activity: Is it the same?!
Reflection of light (and other forms of electromagnetic radiation) occurs when the waves encounter a surface or other boundary that does not absorb the energy of the radiation and bounces the waves away from the surface. The simplest example of visible light reflection is the surface of a smooth pool of water, where incident light is reflected in an orderly manner to produce a clear image of the scenery surrounding the pool. Throw a rock into the pool (see Figure 1), and the water is perturbed to form waves, which disrupt the reflection by scattering the reflected light rays in all directions.
Some of the earliest accounts of light reflection originate from the ancient Greek mathematician Euclid, who conducted a series of experiments around 300 BC, and appears to have had a good understanding of how light is reflected. However, it wasn't until a millennium and a half later that the Arab scientist Alhazen proposed a law describing exactly what happens to a light ray when it strikes a smooth surface and then bounces off into space.
In this activity you will be working as an engineer that is working to modify different kinds of digital cameras and to study the effect of changing incident angle on the reflected angle.
Method
Explain the steps of your experiment and identify the scientific variables:
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
• Independent Variable
----------------------------------------------------------------------------------------------------------------
• Dependent Variable
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
if anyone does ib myp 3. pleaseeee helppp im gonnnnaaa fail.
sciences by concept myp 3 formative assesment.
im giving 50 points please just help meeeeeeeeeeee
the speed of propagation of seismic waves is about 4km/s an earthquake takes place in Turkey at 13:21:00 the center of the earthquake is at 500km from beirut
at waht time would a seismograph in beiurt rcord the earthquake?
Answer:
14:30:00
Explanation:
because the speed of propagation of seismic waves is at 500
If energy is used at a rate of 20.0 J/s in an electric
circuit what is the power developed
Answer:
20watts
Explanation:
Formula for calculating power is expressed as;
Power = Work done/Time
Note that the unit of workdone is Joules
Unit of Time is seconds
Hence the unit of power is Joules/seconds or J/s
Hence if the rate at which energy is used up is 20.0J/s, the power will also be 20J/s or 20watts since they have the same unit.
