Answer:
1 1/2 hours. for Karen to catch Jen.
Explanation:
Karen needs to make up 22.5 km which is the distance Jen travels in 1/2 hour.
The distance where they meet must be equal from the starting point.
Jen
Jen is out 1/2 hour longer.
Let the Karen's time = t
d = r * t
d = 45 * (t + 1/2 hour)
Karen
d = 60 * t
The distances are equal
so
Meeting time
45*(t + 1/2 hour) = 60 * t
45t + 22.5 = 60t Subtract 45t from both sides
22.5 = 15t Divide by 15
t = 22.5 / 15
t = 1 1/2 hours = 1.5 hours.
Now you have to interpret the results.
Remember that Jen has travelled 1/2 hour more than Karen
Her time is 2 hours.
Karen's time is 1.5 hours.
Jen travels 2 hours which is 2 * 45 = 90 miles
Karen travels 1 1/2 hours which is 1.5 * 60 = 90 miles
If a neutron’s relative mass is listed as 1, what would be the relative mass of a proton and an electron?
Answer:
The relative mass of the proton would be 1 and that of the electron
would be about 1/1840.
Question 6.2
Calculate the reading on A2
Answer:
2.25A
Explanation:
that is the answer
what would happen if measurements such as mass,length,volume,or temperature weren't standardized and everyone made up their own units
Answer:
The world would have been blown up by now.
Explanation:
Hypothetically, lets say that someone gave Kim Jong boi a cup of coffee.
He gets mad at the "public servant" since it didn't contain 3 posafa43asdunds of sugar which makes him "big".
The public servant claims they added jfoaj4su38093 units of sugar, which is equivalent to 3 posafa43asdunds.
He gets mad and launches big cannons at Trump since he blames Boe Jiden.
estimate my age in seconds 14 years old
what are gamma rays and what are its uses??
"Gamma rays" is the name that we call the shortest of all electromagnetic waves. They're shorter than radio waves, microwaves, infrared waves, heat waves, visible light waves, ultraviolet waves, and X-rays. They extend all the way down to waves that are as short as the distance across an atom.
Being so short, they carry lots of energy. They can penetrate many materials, and they can damage living cells and DNA. They're dangerous.
The sun puts out a lot of gamma radiation. The atmosphere (air) filters out a lot of it, otherwise there couldn't even be any life on Earth.
As soon as astronauts fly out of the atmosphere, they need a lot of shielding from gamma rays.
You know the precautions we take when we're around X-rays. The same precautions apply around gamma rays, only a lot more so.
It's only in the past several years that we've learned how to MAKE gamma rays without blowing things up. Also, how to control them, and how to use them for medical and industrial applications.
Explanation:
Gamma rays are ionizing electromagnetic radiation, observed by the decay of an atomic nucleus.
Uses of gamma rays :
Sterilize medical requirements. Sterilize food Used as traces in medicine Gamma ray astronomy.ASAP If the initial pressure of a gas is 100 kPa, initial volume is 1.0 L, and final pressure is 25 kPa, what is the final volume?
When no one answers your question...
The final volume is 4.0 liters.
We can calculate the final volume with Boyle's law:
[tex] P_{i}V_{i} = P_{f}V_{f} [/tex] (1)
Where:
[tex] P_{i}[/tex]: is the initial pressure = 100 kPa
[tex] V_{i}[/tex]: is the initial volume = 1.0 L
[tex]P_{f}[/tex]: is the final pressure = 25 kPa
[tex]V_{f}[/tex]: is the final volume =?
Hence, the final volume is:
[tex] V_{f} = \frac{P_{i}V_{i}}{P_{f}} = \frac{100 kPa*1.0 L}{25 kPa} = 4.0 L [/tex]
Therefore, the final volume is 4.0 liters.
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a car advertisement States that a certain car can accelerate from rest to70km/h in 7seconds find the car's average acceleration
Answer:
Acceleration is 2.78 m/s²
Explanation:
Since the car is from rest, initial velocity, u is zero.
from first newton's equation of motion:
[tex]{ \bf{v = u + at}} \\ [/tex]
v is final velocity
u is initial velocity
a is acceleration
t is time
70 km/h is (70 × 1000 ÷ 3600) m/s = 19.44 m/s
[tex]{ \sf{19.44 = 0 + (a \times 7)}} \\ { \sf{7a = 19.44 }} \\ { \sf{a = 2.78 \: {ms}^{ - 2} }}[/tex]
The Empire State Building is 1472 ft high. How long would it take an object dropped from the top to reach the ground
Answer:
Explanation:
Givens
a = 32 feet / second
vi = 0
d = 1472 feet
t = ?
Formula
d = vi*t + 1/2 a t^2
Solution
1472 = 0*t + 1/2 * a * t^2 Multiply both sides by 2
2944 = 32 * t^2 Divide by 32
2944/32 = t^2
92 = t^2 Take the square root of both sides
sqrt(t^2) = sqrt(92)
t = 9.59 seconds
_________at any particular point in a liquid is _________ in all directions
Answer:
Pressure at any particular point in a liquid is transmitted in all directions
Explanation:
I hope you like my answer and my answer helped you .The elevators in the John Hancock building in Chicago move 783 ft in 33 s. What is this speed in miles per hour?
Answer:
16.18 mph
Explanation:
the speed of elevators =
(783×3600)/(33×5280) =
2,818,800/174,240 = 16.18 mph
Help with these please
Answer:
I'll just give short and simple explanation .
Explanation:
when the distance between the masses are doubled but the masses remain the same then,
the gravitational force between two masses decrease by four times when the distance between them is doubled.
hope this helped you
any confusion then comment it.
A family goes on a road trip that is 500 km long. It takes the family 2 hours and 30 minutes to complete the trip. What was the family’s speed?
A) 2.17 km/h
B) 200 km/h
C) 1.33 km/h
D) 250 km/h
Answer:
d
Explanation:
30 minutes = 50 km/h * 5 =250km/h
A family goes on a road trip that is 500 km long. It takes the family 2 hours and 30 minutes to complete the trip. then the family’s speed is 200 km/hr. Hence option B is correct.
What is speed ?Speed is a rate of change of distance with respect to time. i.e. v =dx÷dt. Speed can also be defined as distance over time i.e. speed= distance ÷ time it is denoted by v and its SI unit is m/s. it is a scalar quantity. i.e. it has only magnitude not direction. ( velocity is a vector quantity, it has both magnitude and direction. when we define velocity, we should know about its direction) Speed shows how much distance can be traveled in unit time. As speed is scalar quantity it has nothing to do with the direction. but when magnitude of speed is given and the direction as well, then we can say that a car or body is moving with this much speed at this direction(east, north, west, south).
Speed = distance/ time
Speed = 500 km/2.5hr
Speed = 200 km/hr
Hence option B is correct.
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How many electrons can carbon accept from other atoms while bonding? (1 point)
two
six
eight
four
Answer: Four electrons
Explanation:
The number of electrons that can be accepted by carbon from other atoms while bonding is four. The correct option is D.
What is chemical bonds?A chemical bond is what holds atoms in molecules together. Electrostatic forces between positively charged atomic nuclei and negatively charged electrons, the positions of which in space are determined by quantum mechanics, generate bonds.
Atoms form chemical bonds to strengthen their outer electron shells. The chemical bonding type maximizes the stability of the atoms that form it.
Carbon forms covalent bonds with other elements or carbon atoms. Carbon compounds are extremely diverse, with sizes ranging from one to thousands of atoms.
Because carbon has four valence electrons, it can form four covalent bonds to achieve a full outer energy level.
Thus, the correct option is D.
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3. An electric motor is used to lift a 6.0 kg of mass through a height of 1 metre. The energy it uses is measure on an energy meter is 10 joules.
a) Calculate the work done in lifting the mass
Answer:
Climbing stairs and lifting objects is work in both the scientific and everyday sense—it is work done against the gravitational force. When there is work, there is a transformation of energy. The work done against the gravitational force goes into an important form of stored energy that we will explore in this section.

Figure 1. (a) The work done to lift the weight is stored in the mass-Earth system as gravitational potential energy. (b) As the weight moves downward, this gravitational potential energy is transferred to the cuckoo clock.
Let us calculate the work done in lifting an object of mass m through a height h, such as in Figure 1. If the object is lifted straight up at constant speed, then the force needed to lift it is equal to its weight mg. The work done on the mass is then W = Fd = mgh. We define this to be the gravitational potential energy (PEg) put into (or gained by) the object-Earth system. This energy is associated with the state of separation between two objects that attract each other by the gravitational force. For convenience, we refer to this as the PEg gained by the object, recognizing that this is energy stored in the gravitational field of Earth. Why do we use the word “system”? Potential energy is a property of a system rather than of a single object—due to its physical position. An object’s gravitational potential is due to its position relative to the surroundings within the Earth-object system. The force applied to the object is an external force, from outside the system. When it does positive work it increases the gravitational potential energy of the system. Because gravitational potential energy depends on relative position, we need a reference level at which to set the potential energy equal to 0. We usually choose this point to be Earth’s surface, but this point is arbitrary; what is important is the difference in gravitational potential energy, because this difference is what relates to the work done. The difference in gravitational potential energy of an object (in the Earth-object system) between two rungs of a ladder will be the same for the first two rungs as for the last two rungs.
Converting Between Potential Energy and Kinetic Energy
Gravitational potential energy may be converted to other forms of energy, such as kinetic energy. If we release the mass, gravitational force will do an amount of work equal to mgh on it, thereby increasing its kinetic energy by that same amount (by the work-energy theorem). We will find it more useful to consider just the conversion of PEg to KE without explicitly considering the intermediate step of work. (See Example 2.) This shortcut makes it is easier to solve problems using energy (if possible) rather than explicitly using forces.
More precisely, we define the change in gravitational potential energy ΔPEg to be ΔPEg = mgh, where, for simplicity, we denote the change in height by h rather than the usual Δh. Note that h is positive when the final height is greater than the initial height, and vice versa. For example, if a 0.500-kg mass hung from a cuckoo clock is raised 1.00 m, then its change in gravitational potential energy is
mgh=(0.500 kg)(9.80 m/s2)(1.00 m) =4.90 kg⋅m2/s2=4.90 Jmgh=(0.500 kg)(9.80 m/s2)(1.00 m) =4.90 kg⋅m2/s2=4.90 J
Note that the units of gravitational potential energy turn out to be joules, the same as for work and other forms of energy. As the clock runs, the mass is lowered. We can think of the mass as gradually giving up its 4.90 J of gravitational potential energy, without directly considering the force of gravity that does the
1.
On a fishing trip you catch a bass, a rock cod, and a salmon with masses of 1.07 kg, 6.0 kg, and
6.05 kg, respectively. What is the total mass of your catch with the proper number of significant
figures?
The total mass of your catch is 13.1 kg
Since you have three fishes a bass, a rock cod, and a salmon with masses of 1.07 kg, 6.0 kg, and 6.05 kg, respectively,
The total mass of your catch = mass of bass + mass of rock cod + mass of salmon
= 1.07 kg + 6.0 kg + 6.05 kg
= 13.12 kg
Since the total mass of your catch is 13.12 kg and we have three catches with two catches to two decimal places and one catch to one decimal place.
We cannot have more decimal places in our answer than the number of decimal places in the number with the least number of decimal places.
Since the least number of decimal places is in the mass of the rock cod which is 6.0 kg, the total mass of our catch is thus 13.1 kg to one decimal place.
So, the total mass of your catch is 13.1 kg
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what do you mean by acceleration of a body 10\s?
Answer:
it means that the body is moving with acceleration increased of 10m in every second.
A student has a block that has a volume of 150 cm3 and a density of 30 g/cm3
Answer:
mass of block = 4500g
Explanation:
density = mass/volume
mass = volume x density
= 150 x 30
= 4500 g
9. Liquid A has a density of 1.27 g/mL and liquid B has a density of 0.78 g/mL. Both are poured into the same container. If the liquids do not react chemically, what will happen to the liquids ________________?
Liquid A has a density of 1.27 g/mL and liquid B has a density of 0.78 g/mL. Both are poured into the same container. If the liquids do not react chemically then the liquid B which has a density of 0.78 g/m would come over the liquid because it is a lighter fluid having less density than the liquid A
What is density?It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
formula for density
ρ = mass / volume
Liquids A and B have densities of 1.27 and 0.78 grams per milliliter, respectively. The same container receives both of them. If there is no chemical reaction between the liquids, then liquid B, which has a density of 0.78 g/m, would emerge on the top because it is a lighter fluid and has less density than liquid A.
Thus, If there is no chemical reaction between the liquids, then liquid B, which has a density of 0.78 g/ml, would emerge on the top because it is a lighter fluid and has less density than liquid A.
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What is the kinetic energy of a 500kg car traveling 50m/s
Answer: 625000 J
Explanation:
KE= (1/2)mv^2
m=500kg
v=50m/s
KE= (1/2 )(500)(50)^2
= 625000 J
write the maximum number of electrons that can be accommodated in the s,p,d,f subshells
Answer:
S=2,P=6,D=10,F=14. The total number of electrons contained by s,p,d,f subshells is 32
an experiment involving the scientific method begins with a/an:
Answer:
Step 1. Make observations.
Step 2. Form a hypothesis.
Step 3. Make a prediction.
Step 4. Perform an experiment.
Step 5. Analyze the results of the experiment.
Step 6. Draw a conclusion.
Step 7. Report your results.
Explanation:
The first step in the Scientific Method is to make objective observations. These observations are based on specific events that have already happened and can be verified by others as true or false. Step 2. Form a hypothesis.
Our observations tell us about the past or the present. As scientists, we want to be able to predict future events. We must therefore use our ability to reason.
Scientists use their knowledge of past events to develop a general principle or explanation to help predict future events. The general principle is called a hypothesis. The type of reasoning involved is called inductive reasoning (deriving a generalization from specific details).
A hypothesis should have the following characteristics:
• It should be a general principle that holds across space and time
• It should be a tentative idea
• It should agree with available observations
• It should be kept as simple as possible.
• It should be testable and potentially falsifiable. In other words, there should be a
way to show the hypothesis is false; a way to disprove the hypothesis.
Some mammals have two hind limbs would be a useless hypothesis. There is no observation that would not fit this hypothesis!
All mammals have two hind limbs is a good hypothesis. We would look throughout the world at mammals. When we find whales, which have no hind limbs, we would have shown our hypothesis to be false; we have falsified the hypothesis.
When a hypothesis involves a cause-and-effect relationship, we state our hypothesis to indicate there is no effect. A hypothesis, which asserts no effect, is called a null hypothesis. For instance, the drug Celebra does not help relieve rheumatoid arthritis.
one meter equals how many miles, yards, feet, inches?
Answer:
0.000621 mile
1.094 yards
3 feet 3.37 inches
39.37 inches
Answer:
1m = 0.000621371 miles = 1.09361 yards = 3.28084 feet = 39.3701 inches
Which statement describes the motion of a ball as it drops onto a vertical spring?
a. The acceleration of the ball decreases as the spring shrinks.
b. The accIleration of the ball decreases as the spring extends.
c. The velocity of the ball changes from positive to negative as the spring shrinks.
d. The velocity of the ball changes from negative to positive as the spring extends.
Answer:
F = M a Newton's second law
F = - K x force exerted by compressed spring
a = - K x / M
a) is true because the ball originally is accelerated due to gravity and this acceleration will decrease as the spring in compressed
One could argue for (d) if the downward direction was designated as negative
Prior to maximum compression of the spring the velocity would negative and as the spring began to extend (and the ball began move upward) the velocity of the ball would change from negative to positive
A crane can lift 5000 kg mass to the height 10m in 10 sec. What is its power?
Answer:
49.050 KW
Explanation:
work done = PE
= mgh
=5000×9.81×10
=490500J
power = workdone/Time taken
= 490500/10
= 49050 watts
= 49.050kW
Motion is generally defined as an increase in distance
Answer:
motion is the act of changing location or position
Answer:
Motion is generally defined as an increase in distance with respect to time.
Without time it can't be said in motionwhat is mean mechanical advanteg
Answer:
The ratio of the force produced by a machine to the force applied to it, used in assessing the performance of a machine is called mechanical advantage.
plz and I don't know this plz help me
Answer:
Newton
it is derived of mass and displacement
A bullet fired from a pistol travelled 50 metres to the target in 0.08s. What was its speed?
Its speed is 4m/s
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a.
1
S = ut +
1/2
at2
i. u as subject.
Answer:
[tex]s = ut + \frac{1}{2} at^{2} \\ ut = s - \frac{1}{2} a {t}^{2} \\ u = (s - \frac{1}{2} a {t}^{2} ) \div t \\ u = (s - \frac{1}{2} a {t}^{2} ) \times \frac{1}{t} \\ \\ u = \frac{s}{t} - \frac{1}{2t} a {t}^{2} \\ \\ u = \frac{s}{t} - \frac{1}{2} at \\ [/tex]
I hope I helped you^_^
The centrifugal force which tends to throw the electrons out it's orbit as stated with mass moving velocity in an orbit of radius is given as what?
Answer:
Mass, velocity, and radius are all related when you calculate centripetal force. ... The equation shows that if you increase mass or speed, you'll need a larger force; if you decrease the radius, you're dividing by a smaller number, so you'll also need a larger force.
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