Answer:
p = m .v momentum = mass • velocity. [kg • m/s] [kg] [m/s]. Kinetic Energy. KE = 12 • m • v ... 1. A 1500 kg car traveling at 15 m/s to the south collides with a 4500 kg truck that is ... What is the final velocity of the two-vehicle mass? ... m/s. What is the velocity of the joined cars after the collision? ... 5) = (1.5x104+1.5x604) VELVE.
Explanation:
1The specific heat of substance (X) is greater than that for substance (Y). If equal amounts of heat are added to both these substances, the one reaching the higher temperature(assuming no phase change occurs for either) will be:
1. substance X
2. substance Y
3.there will be no difference in the final temperature.
4.both X and Y
Answer:
Substance Y
Explanation:
A substance with a high specific heat capacity can absorb a large quantity of heat before it will raise in temperature. A substance with a low specific heat requires relatively little heat to raise its temperature. Thus, if the same amount of energy was added to both substances, substance Y will reach the higher temperature, while substance X would require more energy to reach high temperatures.
Answer:
2. substance Y
Explanation:
specific heat is how much heat is needed to warm up something. Y has smaller specific heat means it warm up more w/ same amount of heat.
When a species has no members left that are alive
Answer:
it means that species is extinct.
Explanation:
have a good day :)
A man consumes 2985 kcal of food in one day, converting most of it to body temperature. If he loses half this energy by evaporating water (through breathing and sweating), how many kilograms of water evaporate?
Answer:
m = 2.76 kg
Explanation:
The mass of water evaporated can be found by using the following formula:
[tex]Q = mH\\\\m = \frac{Q}{H}[/tex]
where,
m = mass of water evaporated = ?
Q = Energy used = [tex]\frac{1}{2}(2985\ kcal) = (1492.5\ kcal)(\frac{4.184\ KJ}{1\ kcal})[/tex] = 6244.62 KJ
H = Latent heat of vaporization of water = 2260 KJ/kg
Therefore,
[tex]m = \frac{6244.62\ KJ}{2260\ KJ\kg}[/tex]
m = 2.76 kg
Explain your answer. What parts of your hypothesis were strong correct? What parts were weak?
Use the data from the table and the Punnett Square in your explanation.
This question is from quizlet.
So better check this question!
A student is throwing a ball. She throws the ball up with her left hand, it passes over her head, and she catches it with her right hand. The picture shows the path of the ball. The ball is numbered at different positions. What is happening at position 2?
A.Kinetic energy increases as potential energy decreases.
B.Potential energy increases as kinetic energy decreases.
C.Kinetic energy is zero, and the potential energy is greatest.
D.Potential energy and kinetic energy both stay the same.
Answer:
(c) at point 2, the ball is at its highest height do its PE is max. Also at ms height, velocity is zero therefore KE is zero.
Who serves as the presiding officer of the Senate?
Who serves as the presiding officer of the Senate?
[tex]{ \bf{ \underbrace{Answer :}}}[/tex]
The [tex]\sf\purple{Vice\:President}[/tex] of the United States serves as the presiding officer of the Senate.
At present, [tex]\sf\red{Kamala\:Harris}[/tex] is the president of the Senate.
[tex]\bold{ \green{ \star{ \orange{Hope\:it\:helps.}}}}⋆[/tex]
WILL GIVE BRAINLIEST
Answer:
2.5N
Explanation:
Given :
Mass = 0.5kg
Acceleration = 5 m/s²
For the glass to accelerate, a force, F = ma must act on it in the right direction :
F = ma
F = 0.5kg * 5m/s
F = 2.5 kgm/s
F = 2.5 N
The net force required such that the glass accelerates 5m/s² to the right is 2.5N
54. Which of the following behaviors is most closely
associated with the foot-in-the-door phenomenon?
(A) Beth continues to participate in class because
she is positively reinforced.
(B) Adam is sleeping while the rest of his
classmates are working on their group
project
(C) Sutan asks his father for $5, and when he
agrees, Sutan asks him for $15 more.
(D) James feels pressure to go to the movies with
his friends even though he prefers to go
bowling.
(E) Diana feels guilty because she did not help
her family clear the table after dinner.
Answer:
C
Explanation:
Foot-in-the-door technique is a compliance tactic that aims at getting a person to agree to a large request by having them agree to a modest request first
The behavior that should be closely associated is option c. Sutan asks his father for $5, and when he agrees, Sutan asks him for $15 more.
What is the foot-in-the-door phenomenon?It is a tactic of compliance that focuses on agreeing on the person by having a request.
It shows the connection that lies between the person who is asking for a request and the person who is being asked.
So based on this, option c is correct.
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HELP PLEASE!!!!!!!!!!!!!!
B. convex lens forms larger virtual image, is the correct answer.
How much energy is needed to melt 150 g of ice at 0°C to water? (1)(Lf =3.34˟ 10⁵ J/Kg)
50 100 000J
50.1J
50 100J
501000 J
5 min
Answer:
5.01×10⁴ J.
Explanation:
Applying,
q = Cm....................... Equation 1
Where q = amount of heat needed to melt the ice, m = mass of the ice, C = specific latent heat of ice.
From the question,
Given: m = 150 g = (150/1000) kg = 0.15 kg, C = 3.34×10⁵ J/kg
Substitute these values into equation 1
q = (0.15×3.34×10⁵)
q = 0.501×10⁵ J
q = 5.01×10⁴ J.
How far would a horse that rides at 9.8 m/s travel in 9.8 minutes?
Answer:
distance = 96.04 m
Explanation:
velocity is distance over time when velocity is multiplied by time, the time in the numberator is canceled by the time in the denomiator leaving only distance.
distance = velocity * time
distance = 9.8[m/s] * 9.8[s]
distance = 9.8 * 9.8 [m]
Two-fifths of a number is 23.2, find
the number.
A. 116.0
B. 58.0
C. 46.4
D. 29.0
E. 14.5
11
Considering the definition of an equation and the way to solve it, the correct answer is option B.: the number is 58.
Definition of equationAn equation is an algebraic equality in which letters (unknowns) appear with unknown value in addition to certain known data.
An equation has:
The members, which are each of the expressions that appear on both sides of the equal sign.The terms, which are the addends that form the members of an equation.The solution of an equation is to find the value of the unknown or unknowns that verify the equality. To solve an equation, keep in mind:
When a value that is adding, when passing to the other member of the equation, it will subtract.If a value you are subtracting goes to the other side of the equation by adding.When a value you are dividing goes to another side of the equation, it will multiply whatever is on the other side.If a value is multiplying it passes to the other side of the equation, it will pass by dividing everything on the other side.This caseBeing "x" the number you want to find and knowing that two-fifths of a number is 23.2, the equation in this case is:
2/5x= 23.2
Solving:
x= 23.2 ÷ 2/5
x= 58
Finally, the number is 58.
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The Earth orbits the Sun at a speed of 30 km/s. At that speed it completes one path around the Sun every year. Of course, as that happens we are heading toward a different place in space constantly, always accelerating toward the Sun to stay on the circular path. Suppose at a paritcular instant we are headed in the direction of a distant star and we measure the speed of the light from that star as it arrives on Earth. In the vacuum of space we would measurea. 299,792,458 m/sb. 299,792,428 m/sc. 299,792,488 m/sd. 0 m/s
Answer:
a. 299,792,458 m/s
Explanation:
Since the speed of light in a vacuum is invariant and has the value of 299,792,458 m/s, we would measure this value of 299,792,458 m/s for the speed of light from the star as it arrives on Earth.
Question 2 of 25
An electromagnetic wave has a frequency of 1.0 x 105 Hz. What is the
wavelength of the wave? Use the equation 1 = and 3.0 x 108 m/s for the
speed of light.
A. 3.0 1013 m
B. 3.3 x 1012 m
C. 3.3 x 10-4 m
O D. 3.0 x 103 m
Answer:
D
the wavelength is the speed divide by the frequency
After rolling halfway down an incline a marble's kinetic energy is
A. impossible to determine
B. the same as its potential energy
C. greater than its potential energy
D. less than its potential energy
a spring has a spring constant of 330 n/m. how far is the spring compressed when 150 newtons of force are used?
a. 0.0014 meters
b. 0.45 meters
c. 2.2 meters
d. 5.0 meters
show your work.
Answer:
b. 0.45 meters
Explanation:
Given the following data;
Spring constant, k = 330 N/m
Force = 150 N
To find the extension of the spring;
Mathematically, the force exerted on a spring is given by the formula;
Force = spring constant * extension
Substituting into the formula, we have;
150 = 330 * extension
Extension, e = 150/330
Extension, e = 0.45 meters
If a 400-mm diameter pipe with a pipe roughness coefficient of 100 flows full of pressurized water with a head loss of 0.4 ft per 1,000 ft of pipeline, what is the flow rate? Use the Hazen-Williams method
Answer:
Q = 913.9 gpm
Explanation:
The Hazen Williams equation can be written as follows:
[tex]P = \frac{4.52\ Q^{1.85}}{C^{1.85}d^{4.87}}[/tex]
where,
P = Friction Loss per foot of pipe = [tex]\frac{0.4}{1000\ ft}[/tex] = 4 x 10⁻⁴
Q = Flow Rate in gallon/min (gpm) = ?
d = pipe diameter in inches = (400 mm)(0.0393701 in/1 mm) = 15.75 in
C = roughness coefficient = 100
Therefore,
[tex]4\ x \ 10^{-4} = \frac{4.52\ Q^{1.85}}{(100)^{1.85}(15.75)^{4.87}}\\\\Q^{1.85} = \frac{4\ x \ 10^{-4}}{1.33\ x\ 10^{-9}} \\\\Q = (300384.75)^\frac{1}{1.85}[/tex]
Q = 913.9 gpm
Can you rule out natural factors as the main cause of today's climate change?
Answer:
Yes, as today human activities are the main cause for climate change.
In recent years, due to the over-consumption of primary sector products, the reckless over-consumption of natural resources and the increase of the earth's population, the natural environment has deteriorated, resulting in an imbalance between the countries of the developed and developing world in terms of climatic and environmental security. The global purpose of states, institutions and associations is to work together for sustainable development at all geographical levels and to fight inequality at the international level. At the same time, it is characteristic that a global movement has developed to demand the equal distribution of environmental burdens and climate justice.
63. Which of the following types of validity is estab-
‘lished by demonstrating that there is a correlation
between scores on a test and later academic
performance?
(A) Content
(B) Predictive
(C) Face
(D) Concurrent
(E) Test-retest
Help I beg someone please help please
Answer:
Content
Explanation:
The type of validity that is established by demonstrating a correlation between scores on a test and later academic performance is known as CONTENT VALIDITY
The above statement is true because Content validity is a form of validity testing used to assess whether the outcome of a test is a precise measure of the fundamental aspect or domain of the construct.
Hence, to provide a credible result, content validity ensures it covers all suitable parts of the content or topic it attempts to measure.
A solid sphere, spherical shell, solid cylinder, and a cylindrical shell all have the same mass m and radius R. The same torque is applied on the rim for each of them, so that they all start to rotate about their long central axes from rest. Which object has the greatest angular speed after the same time interval
Answer:
the solid sphere has the smallest moment thus angular veloicty is the largest in the system
Explanation:
One of the easiest ways to solve this exercise is by using Newton's second law for rotational motion.
τ = I α
α = τ / I
now let's use the rotational kinematics relations
w = w₀ + α t
as the bodies start from rest, their angular velocity is zero w or = 0
w = α t
we substitute
w = [tex]\frac{\tau }{I} \ t[/tex]
the body's inertia moments are
a) solid sphere I₁ = 2/5 m r²
b) spherical shell I₂ = ⅔ me r²
c) solid cylinder I₃ = ½ m r²
d) cylindrical shell I₄ = m r²
Let's analyze the expression for angular velocity, all bodies apply the same torque and it is measured in time, therefore the angular velocity is inversely proportional to the moment of inertia.
When examining the moment of inertia the largest is the moment of inertia of the cylindrical shell
the one with the lowest initial moment
we take all the values to fractions with the same denominator
I₁ = 2/5 6/6 m r² = 12/30 m r²
I₂ = ⅔ 10/10 m r² = 20/30 m r²
I₃ = ½ 15/15 m r² = 15/30 m r²
therefore the order of the moments of inertia is
I₁ <I₃ <I₂ <I₄
Therefore, since the solid sphere has the smallest moment thus angular veloicty is the largest in the system
what must happen for a electromagnet to have a magnetic field
A bicyclist at the top of a hit begins to coast without pedaling. The bicycle speeds up as it descends to the bottom of the hill and then slows down as it continues
up a second, where it stops. Which of these sequences best describes the energy change of the bicycle from the top of the hill until it stops?
A.potential - kinetic-kinetic
B.Kinetic -potential -potential
C.Kinetic -potential -Kinetic
D.potent - Kinetic -potential
what is a transformer
Answer:
An electrical box that regulates all the electricity for an area.
If the mass of the slider increases does the coefficient of static friction also increase?explain
No, the mass of the slider increases does not increase the coefficient of static friction.
What is static friction?In static friction, the frictional force resists force that is applied to an object, and the object remains at rest until the force of static friction is overcome.
As the mass increases, the static friction increases. This is because the normal force increases as the mass increases.
Also, the coefficient of friction doesn't depend on the mass of the object.
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12. 2007: The figure below show two identical trollbys with loads A and B. The
loads are identical in shape and size.
D
Given that the density of A is greater than that of B, explain why the
trolley in figure 3 (in) is more stable
Answer:
you need to provide a figure that came with the problem.
4. In the display window of the toy store at the local mall, a battery-powered plane is suspended from a string and flying in a horizontal circle. The 631 gram plane makes a complete circle every 2.15 seconds. The radius of the circle is 0.950 m. Determine the velocity, angular velocity, acceleration, and net force acting upon the plane.
Answer:
The solution is given below
Explanation:
The computation is shown below:
Given that
Mass of plane, m is 631 g = 0.631 Kg
The Time period for one circle is 2.15 s
The Radius of circle = 0.95 m
Now the velocity of the plane, v = rω
where,
angular velocity, ω = (θ ÷ t)
For one complete circle, θ = 2π
and Time period T is provided = 2.15 s
Thus, ω = 2π ÷ T = 2π ÷ 2.15
So, velocity, v = rω
= r × ( 2π ÷ 2.15 )
= 0.95 × (2π ÷2.15)
= 2.776 m/s
The Acceleration of the plane, a = rω^2
= 0.95 × (2π ÷ 2.15)^2
= 8.114 m/s^2
The Net force acting upon the plane, F = Centripetal force i.e.
= mv2 ÷ r
F = mv2 / r
= (0.631 × 2.7762) ÷ 0.95
= 5.118 N
A physics student was studying falling bodies and decided to drop a water balloon from an outdoor stairwell to measure its speed. If the balloon was dropped a distance of 6 meters and it only took 1.1 seconds to fall, how fast was the balloon traveling on average? A. 0.2 m/s B. 6.6 m/s C. 5.5 m/s D. 66 m/s
WILL NAME BRAINLIEST
Answer:
C. 5.5 m/s
Explanation:
How fast the balloon travels is determined from the velocity or v
The formula is v = s/t or velocity equals distance divided by time
So, v = 6 meters divided by 1.1 seconds = 5.5 meters per second
Answer:
C. 5.5 m/s
Explanation:
How fast the balloon travels is determined from the velocity or v
The formula is v = s/t or velocity equals distance divided by time
So, v = 6 meters divided by 1.1 seconds = 5.5 meters per second
Compare two vectors that are of the same magnitude but are in opposite direction. Write 4 points to do this.
Answer:
jsuxgbqnqozygxnwkisgx
Explanation:
jducgsjqkzhxbbekxochdbjsixgwjdk
A 200kg car is driving at 20m/s down the road when he sees a red light. He slows to a stop.
The car's initial momentum is ___kg m/s
The car's final momentum is ___kg m/s
The car's impulse is
___kg m/s
Answer:
Initial Momentum - 4000 kg*m/s
Final Momentum - 0 kg*m/s
Impulse: -4000 kg*m/s
Explanation:
The equation for momentum is P = mv
Initial Momentum
200kg * 20m/s = 4000 kg*m/s
Final Momentum
200kg * 0m/s = 0kg*m/s
Impulse = ΔP
Pfinal - Pintial = Impulse
0-4000 = -4000 kg*m/s
How is Newton’s 3rd law in baseball?
Answer:Explanation: According to Newton's third law, the force exerted by the bat hitting the ball will be equal in magnitude but opposite in direction of the force the ball exerts on the bat. Generally, your arms are stiff when you hit the ball forward, so you will not feel the bat "recoiling".
Explanation: