Answer:
90 km/hr
Explanation:
AVERAGE is 60 km/hr so 120 km / 60 km/hr = 2 hours total
first 30 km / 30 km / hr = 1 hour used 1 hour left
now there is 90 km to cover in the second hour
so that must be 90 km/hr
In reality, the kinetic energy at the bottom of the ramp will always be less than the gravitational potential energy at the top of the ramp. Does this disprove the law of conservation of energy? Where did the "lost" energy go?
Answer:
Conservation of energy still holds - so somewhere in traversing some of the potential energy was converted into something other than kinetic energy.
The loss of energy can be attributed to several things - friction on the ramp, air resistance, friction within the item descending the ramp; in general one would say that some of the initial PE was lost during the descent of the ramp. and did not show up as KE.
On average, each square metre of the solar
panel above receives 1000 joules of energy
from the Sun every second. Use this figure to
calculate the power input (in kW) of the panel if
its surface area is 2 m?
1 m² = 1000 J/s = 1000 watt = 1 kW
so for 2 m²:
= 2 x 1 kW = 2kW
A sample contains 16 g of a radioactive isotope. how much radioactive
isotope remains in the sample after 1 half-life?
After one half-life, 8 g of radioactive isotope will remain in the sample.
What is radioactivity?The act of producing radiation spontaneously is known as radioactivity. This is accomplished by an unstable atomic nucleus that want to give up some energy in order to move to a more stable form.
The following formula is used to compute the number of half lives elapsed:
[tex]\rm N=\frac{N_0}{2^n} \\\\ N=\frac{16}{2} \\\\ N= 8 \ gram[/tex]
Hence,8 gram of radioactive isotope remains in the sample after 1 half-life.
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Answer:
Answer is below
Explanation:
8 g
can someone help me and give me the right answer
Answer:
C. sedimentary
Explanation:
Answer:
Sedimentary
Explanation:
Igneous rock- A rock that's formed through the cooling and solidification of magma or lava.
Metamorphic rock- A rock that starts out as another rock and often has a striped appearance.
Volcanic rock- A rock that's formed from lava that erupted from a volcano.
Sedimentary is the only right answer. A Sedimentary rock is a rock thats made from the deposition of lots of pieces of eroded rock particles.
Which picture shows an example of no work being done? A man and a woman hold a child in the air by the child's hands. A man pushes a shopping cart down the aisle of a grocery store. A child holds the bar of a set of weights without moving. A woman pulls a rolling suitcase.
Answer:
A child holds the bar of a set of weights without moving I think
The mass of 1 dozen dimes is 27.22 g. the numerical value of the mass of 5 dozen dimes can be obtained by
Answer:
by obtaining the total mass of the dimes present:
d = 27.22 g / dozen the density of dimes
M = n * d = 5 dozen * 27.22 g / dozen = 126.1 g
which of the following is correct based on the given illustration?
A. south Pole experiences autumn while North Pole experiences Winter
B. South Pole experiences summer while North Pole experiences Spring
C. North Pole experiences summer while South Pole experiences Winter
D. North Pole experiences winter while South Pole experiences summer
*The Subject is Science btw*
You want to reduce your energy bills.
A) calculate the power of a lightbulb that transfers 6000 joules every minute.
B) calculate the power of a different lightbulb that has a current of 0.05 amps through it when there is a potential difference of 240 volts across it.
C) both bulbs are equally bright. State and explain which lightbulb you should use.
Answer:
A) P = W / t = 6000 / 60 = 100 J/s == 100 watts
B) P = I V = .05 * 240 = 12 watts
C) Bulb B) uses much less power
a bus velocity 20m/s towards the east and another bus has velocity 15m/s in west direction.if they start to move from a point simultaneously.what distance do they cover in 2 minutes. what will be their separation.
Answer:
Velocity towards east = 20m/s
Distance in 2 min(120 sec) = 20 x 120= 2400m = 2km
Velocity towards west = 15m/s
Distance in 2 min(120 sec) = 15 x 120 = 1800m = 1.8km
Separation= 2+1.8 = 3.8km
Explanation:
Hope it helps you:))))))
have a good day
the speedodemeter of a car moving northward reads 60 km/hr. it passes another car that travels south at 60 km/hr. do both cars have the same speed and velocity?
Answer:
It passes another car that travels southward at 60 km/h. Do both cars have the same speed? Do they have the same velocity? Answer: Both cars have the same speed, but they have opposite velocities because they are moving in opposite directions.
Explanation:
Answer:
See below ~
Explanation:
As the magnitude (absolute numerical value) of both cars are equal, they both have the same speed.
But, as they are travelling in opposite ways, they have different directions. Hence, they have different velocities.
Romeo and Juliet are sitting on a balcony 1.2 meters apart. If Romeo has
a mass of 69.3 kg and Juliet has a mass of 52.0 kg, what is the attractive
force between them?
F = G M.m/r²
F = force, N
G = gravitational constant, 6.67 x 10⁻¹¹ Nm²/kg²
m,M = mass of object, kg
r = distance, m
F = 6.67 x 10⁻¹¹ x 69.3 x 52/1.2²
F = 1.669 x 10⁻⁷
A student made the claim that a 4 gram paintball fired from a paintball gun at 90 m/s could have about the same kinetic energy as a 1 gram BB pellet fired from a BB gun at 180 m/s.
Do you agree or disagree with the student's claim? Use evidence and mathematical reasoning to support your response.
This question involves the concept of kinetic energy.
The student's claim is "right".
Kinetic EnergyThe energy possessed by a body, by the virtue of its motion is called kinetic energy. Mathematically it is given by the following formula:
[tex]K.E =\frac{1}{2}mv^2[/tex]
where,
K.E = Kinetic energy m = massv = velocityTherefore,
For the paintball:
[tex]K.E = \frac{1}{2}(4\ g)(90\ m/s)^2[/tex]
K.E = 16200 J
For the pellet:
[tex]K.E = \frac{1}{2}(1\ g)(180\ m/s)^2[/tex]
K.E = 16200 J
Hence, both paintball and pellet will have same kinetic energy. The student is right.
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NEED HELP ASAP WILL GIVE 20 POINTS
Floods are natural disasters that can cause what other natural disaster?
tsunami
landslide
hurricane
erosion
Your training partner has stopped pedaling during the spinning class you are both taking. She wants to check her exercise intensity level. You have a piece of exercise technology for this job and can continue to pedal while keeping tabs on your workout progress. Select the choice below that you would be using.
Group of answer choices
Heart rate monitor
Blood pressure monitor
Stopwatch
Pedometer
Answer:
Heart rate monitor I think
Explanation:
you would know how intense the pedaling is by knowing your heart beat rate as of the pedaling is so intense your heart beat increases and if it was not so much your pedaling is not so intense.
This works also for any other sports .
~--Hope this helped--~
Answer: it’s Heart rate monitor
Explanation:
you use a heart rate monitor to check your intensity level by seeing how fast your heart goes
Which of these is described as force per unit charge on a positive test charge?
OA test charge
OB. source charge
OC. electric force
OD. electric field
OE electric current
Help!
Answer:
Sorry if im late
The answer is Electric field (D)
Explanation:
The electric field is thought of as the force per unit positive charge that can be exerted before the field is disturbed by the presence of a test charge.
hope this still helped :)
~rere
Answer:D
Explanation:
I have answer key
What type of waves do not require a medium to travel?.
Answer:
electromagnetic waves
the following are three frequencies of sound wave:
1800Hz,50Hz,10,000Hz.
a).which has the highest pitch and which has the lowest pitch?
b).what does Hz stands for?
The powertrain of many machines consists of _____
gears - answer
linkages
trusses
splines
Answer:
gears - answer
Explanation:
Hope it helps
how is newton’s first law of motion used for a person in a stationary car during a car crash
Answer:
When the car crashes, there is no unbalanced force acting on the person, so they continue forward (Newton's First Law). The person moves against the seat belt, exerting a force on it.
You want to design a rollercoaster that will be able to go around a loop-the-loop on earth (where the value of g is 10 N/kg). If the mass of the rollercoaster is 6,000 kg and it is going 40 m/s at the bottom of the loop, calculate the maximum height of the top of the loop. Assume there is no energy input (motors, etc) or friction or any other energy waste in this system.
Answer:
[tex]64\; {\rm m}[/tex], assuming that the rollercoaster is not attached to the track.
Explanation:
Let [tex]r[/tex] denote the radius of the loop. The height of the top of the loop would be [tex]2\, r[/tex].
Let [tex]a[/tex] denote the acceleration of the rollercoaster. At any position in the loop, if the speed of the rollercoaster is [tex]v[/tex], the (centripetal) acceleration of the rollercoaster would be:
[tex]\displaystyle a = \frac{v^{2}}{r}[/tex].
Let [tex]m[/tex] denote the mass of the rollercoaster. The net force on the rollercoaster would then be:
[tex]\displaystyle F_\text{net} = m\, a = \frac{m\, v^{2}}{r}[/tex].
The rollercoaster would stay on the track (and goes around the loop without falling off) only if the normal force [tex]F_\text{normal}[/tex] between the track and the rollercoaster is non-negative. In other words: it is necessary that [tex]F_\text{normal} > 0[/tex] for the rollercoaster to stay on the track.
At the top of the loop, [tex]F_\text{normal}[/tex] and the weight of the rollercoaster [tex]m\, g[/tex] are in the same direction as the centripetal acceleration (downwards towards the center of the loop.) Hence:
[tex]F_\text{net} = F_\text{normal} + m\, g[/tex].
Let [tex]v_\text{top}[/tex] denote the speed of the rollercoaster at the top of the loop.
[tex]\begin{aligned} F_\text{normal} &= F_\text{net} - m\, g \\ &= \frac{m\, v_\text{top}^{2}}{r} - m\, g\end{aligned}[/tex].
If [tex]F_\text{normal} > 0[/tex] at the top of the loop, then:
[tex]\displaystyle \frac{m\, v_\text{top}^{2}}{r} - m\, g > 0[/tex].
[tex]\displaystyle v_{\text{top}}^{2} > g\, r[/tex].
At the same time, by the conservation of energy, the sum of the kinetic energy [tex]\text{KE}[/tex] and gravitational potential energy [tex]\text{GPE}[/tex] of the rollercoaster should stay the same during the entire ride. Assuming that [tex]\text{GPE}\![/tex] is [tex]0[/tex] at the bottom of the loop:
[tex]\begin{aligned}& \text{KE at the bottom}\\ &= \text{KE at the top} + \text{GPE at the top}\end{aligned}[/tex].
Let [tex]v_{0}[/tex] denote the speed of the rollercoaster at the bottom of the loop.
[tex]\begin{aligned}\text{KE at the bottom} = \frac{1}{2}\, m\, {v_{0}}^{2}\end{aligned}[/tex].
The speed of the rollercoaster at the top of the loop [tex]v_\text{top}[/tex] is at least [tex](g/r)[/tex]. Therefore:
[tex]\begin{aligned}& \text{KE at the top}= \frac{1}{2}\, m\, {v_{\text{top}}}^{2} > \frac{1}{2} \, m\, g\, r\end{aligned}[/tex].
Since the height of the loop is [tex]2\, r[/tex], the [tex]\text{GPE}[/tex] of the rollercoaster at the top of the loop would be:
[tex]\text{GPE at the top} = m\, g\, h = 2\, m\, g\, r[/tex].
Thus:
[tex]\begin{aligned} \frac{1}{2}\, m\, {v_{0}}^{2} &= \text{KE at the bottom}\\ &= \text{KE at the top} + \text{GPE at the top} \\ & > \frac{1}{2}\, m\, g\, r + \text{GPE at the top}\\ & = \frac{1}{2}\, m\, g\, r+ 2\, m\, g\, r \\ &= \frac{5}{2}\, m\, g\, r\end{aligned}[/tex].
In other words:
[tex]\displaystyle \frac{1}{2}\, m\, {v_{0}}^{2} > \frac{5}{2}\, m\, g\, r[/tex].
Rearrange and simplify to obtain a bound on [tex]r[/tex]:
[tex]\begin{aligned} r < \frac{(1/2)\, m\, {v_{0}}^{2}}{(5/2)\, m\, g}\end{aligned}[/tex].
[tex]\begin{aligned} r < \frac{{v_{0}}^{2}}{5\, g}\end{aligned}[/tex].
Given that [tex]v_{0} = 40\; {\rm m\cdot s^{-1}[/tex] and [tex]g = 10\; {\rm N \cdot kg^{-1}} = 10\; {\rm m\cdot s^{-2}[/tex]:
[tex]\begin{aligned} r & < \frac{{v_{0}}^{2}}{5\, g} \\ &= \frac{(40\; {\rm m\cdot s^{-1}})^{2}}{5 \times (10\; {\rm m\cdot s^{-2}})} \\ &= 32\; {\rm m}\end{aligned}[/tex].
Hence, the radius of this loop is at most [tex]32\; {\rm m}[/tex], such that the height of the top of this loop is at most [tex]2 \times 32\; {\rm m} = 64\; {\rm m}[/tex].
Which definition describes work?
Answer:
i would say putting effort into something
Explanation:
Answer:
put many effort into one thing or many
the earth had a mass of 6,000,000,000,000,000,000,000,000 kg. and a radius of 6,371,000 m, what will be the gravitational force experienced by a puppy with a mass of 4.6 kg playing on the earth sur face
Answer:
Mass of Earth (M1) = 6×10^24 kg
Mass of Puppy (M2) = 3.6 kg
Radius (R) = 6371000 m
Universal Gravitational Constant (G) = 6.67 × 10^11
Now,
Gravitational Force = G×M1×M2 / R^2
GF = 6.67 × 10^11 × 6 × 10^24 × 3.6 / (6371000)^2
GF = 144.072 × 10^35 / 40,589,641,000,000
GF = 3549.477 × 10^20
A student shakes a rope such that 36 complete vibrations are
made in 9.00 seconds. determine the vibrational period of
the rope, along with the corresponding unit.
The vibrational period of the rope, when a student shakes it is 0.25 s.
What is the frequency?Frequency is the number of oscillations per second.
Given is the number of vibrations =36 in time t = 9s, then frequency will be
f = 36/9 =4Hz
The time period is the reciprocal of the frequency.
T = 1/f
Plug the frequency value, we get
T = 1/4 Hz = 0.25 seconds
Thus, the vibrational time period is 0.25s.
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If the volume of a container increases what
effect will this have on pressure? Why?
As the volume of the container increases the pressure inside will decrease because the atoms have more room to move around in.
Answer:
In a container of the same volume, a greater number of molecules results in greater pressure. Gas pressure increases as container volume decreases.
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Thankyou for joining Brainly Communicty!!What will be an ideal location for the exhaust fan on your Kitchen wall,
10m or 12m above the floor? Justify your answer.
The ideal location for the exhaust fan on your Kitchen wall should be 12m above the floor.
What is exhaust fan?Exhaust fan is defined as the device that is used to remove excess moisture, odors, and stale air usually from the kitchen.
When being installed in the kitchen, it should be above the kitchen stove and high enough to be able to remove the steam from the cooking activities.
Therefore, the ideal location for the exhaust fan on your Kitchen wall should be 12m above the floor.
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Before his weight lifting event Andrew would like to get a quick boost of energy. Which source of nutrition should Andrew consume prior to the match to get the boost of energy he desires
The source of nutrition that Andrew should consume prior to the match to get the boost of energy he desires is carbohydrate.
What is nutrition?Nutrition refers to the organic process by which an organism assimilates food and uses it for growth and maintenance.
There are 6 major classes of nutrients and they are as follows:
CarbohydratesProteinsLipidsVitaminsMineralsAmong these classes of nutrients, carbohydrates provide the fastest source of energy in the body and hence, can be recommended for an athlete like Andrew who is preparing for a weight lifting endeavor.
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Please help mee please
Answer:
eV to Joules just multiply by 1.602 × 10^-19
Hence, 1.5eV = 1.5 × 1.602 × 10^-19 J
= 3.04 × 10^-19 J
A 40.0 kg objects is subject to two forces, one of +18.0 N and one of -6.0 N. What is the acceleration the crate undergoes?
A. 0.3 m/s2 B. 1.67 m/s2 C. 3.3 m/s2 D. 4.0 m/s2 E. 480 m/s2
∑F=m.a
18 - 6 = 40 x a
12 = 40a
a = 0.3 m/s²
A hot air balloon pilot is choosing a day and time to launch her new balloon. Table 1 shows the weather forecast for the next three days.
Temperature at 6 a.m. (°C). Temperature at 12 p.m. (°C). Temperature at 6 p.m. (°C)
Monday. 4. 18. 22
Tuesday. 6. 19. 24
Wednesday. 10. 20. 25
If the pilot wants to rise as high as possible while using as little fuel as possible, on which day should she launch her balloon? Explain your answer.
The balloon will rise the most on Wednesday due to high temperature that will increase the thermal energy of the balloon and cause it to rise higher.
Average daily temperatureThe average daily temperature of the different days is calculated as follows;
Monday = (4 + 18 + 22)/3 = 14.67 ⁰C
Tuesday = (6 + 19 + 24)/3 = 16.3 ⁰C
Wednesday = (10 + 20 + 25)/3 = 18.3 ⁰C
The average daily temperature of Wednesday is the greatest.
The balloon will rise the most on Wednesday due to high temperature that will increase the thermal energy of the balloon and cause it to rise higher.
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what are the characteristics of images formed by plane mirrors
Answer:
the image is erectthe image is laterally invertedimage is formed at the same distance from the mirror as the object is in front of itthe image is of same size as that of the objectthe image is virtual (cannot be obtained on a screen)
