Correct Answer:
3.1375
Explanation:
Use equation [tex]Q=mc[/tex]Δ[tex]T[/tex] to find [tex]m[/tex]
Plug in all variables [tex]-50200=x\cdot 2000\cdot -8[/tex]
Answer: 3.1375
Final answer:
The mass of the ice block is approximately 3.01 kg, calculated using the relation Q = mcΔT with the values given and the specific heat capacity of ice.
Explanation:
To determine the mass of the ice based on the heat removed and the temperature change, we can use the following relation from thermodynamics:
Q = mcΔT
Where:
Q is the heat energy transferred (in Joules)m is the mass of the substance (in kilograms)c is the specific heat capacity (in J/kg°C)ΔT is the change in temperature (in °C)For ice, the specific heat capacity (c) is approximately 2.09 J/g°C or 2090 J/kg°C. Plugging in the values, we have:
50,200 J = m × 2090 J/kg°C × 8°C
Solving for m:
m = 50,200 J / (2090 J/kg°C × 8°C) = ≈ 3.01 kg
Therefore, the mass of the block of ice is approximately 3.01 kg.
The speed at which an object falls and the acceleration at which it falls are
always the same value.
O
O
A. True
B. False
No, the speed at which an object falls is not equal to the acceleration at which it falls.
Answer:
Option B
Explanation:
Speed is defined as how fast an object can cover a specific distance and in what time it covers. So it is measured as the ratio of distance covered to the time taken to cover that distance. While acceleration is the rate of change of velocity. Moreover, speed is a scalar quantity and acceleration is a vector quantity. So most of the times, the direction will play an important role in the varying values of speed and acceleration. Also, acceleration of an object will depend upon the force and mass of the object. Thus, speed and acceleration will not attain same value always.
A uniform brick of length 18 m is placed
over the edge of a horizontal surface with a
maximum overhang of 9 m attained without
tipping.
K18 m
Now two identical uniform bricks of length
18 m are stacked over the edge of a horizontal
surface.
K18 m
What maximum overhang is possible for
the two bricks (without tipping)?
Answer in units of m.
Answer:
13.5
Explanation:
x= Length
.5 = Center Point
x=0.5(9)= 4.5
So total length over the edge will be given as
Length (L) =9+4.5=13.5
The maximum overhang for two uniform bricks of length 18 m each, when stacked, is 13.5 m. This is determined by considering the center of mass and static equilibrium of the bricks.
Explanation:The question involves the concept of static equilibrium and center of mass in the field of physics. When two uniform bricks of length 18 m are stacked and placed such that they overhang the edge of a surface, the maximum overhang is achieved when the center of mass of the system is still supported by the surface. To find the maximum overhang for two bricks, we can apply the principle of moments. For two stacked bricks, the bottom brick can overhang by half its length, namely 9 m. The top brick can be shifted further out but must keep its center of mass over the bottom brick. The maximal overhang of the second brick is therefore half of what remains from the first brick, which is ½ × 9 m = 4.5 m. Hence, the maximum overhang for the top brick is 4.5 m beyond the end of the bottom brick, which itself overhangs by 9 m. Consequently, the total maximum overhang for two stacked bricks is 13.5 m.
What dose a horizontal line on a distance-time graph mean?
Answer:
A horizontal line means the object is not changing its position - it is not moving, it is at rest. • A downward sloping line means the object is returning to the start. SPEED-TIME GRAPHS. Speed-Time graphs are also called Velocity Time graphs.
Explanation:
Answer: The object is moving in a constant speed.
Explanation: In a distance time graph a horizontal line indicates a zero slope which means the object maintains a constant speed in motion. Rising slope an increase in speed and a slope going down indicates a decrease in speed.
how many neutrons are in calcium
Answer:
I believe there are 20 Neutrons in Calcium.
Explanation:
Final answer:
Calcium has several isotopes, with calcium-40 being the most common and containing 20 neutrons. The number of neutrons in an isotope of calcium can be found by subtracting the atomic number (20) from its mass number. Other isotopes like calcium-48 contain 28 neutrons.
Explanation:
To determine how many neutrons are in calcium, we look at its atomic number (Z) and its mass number (A). Calcium's atomic number is 20, which means it has 20 protons.
The most common isotope of calcium is calcium-40, which has a mass number of 40. To find the number of neutrons, we subtract the atomic number from the mass number:
Neutrons = Mass number - Atomic number = 40 - 20 = 20 neutrons
Therefore, calcium-40 contains 20 neutrons. There are other isotopes of calcium as well, such as calcium-48, which has 28 neutrons, and it is characterized by a half-life of about 2×10¹⁶ years, making it relatively stable.
When calcium forms a cation, such as Ca²⁺, it still retains its 20 protons and the number of neutrons does not change due to electron gain or loss. The resulting ion would have 18 electrons and carry a +2 charge.
A baseball player runs 27 m from third base to home plate in 3.2 s. What is
his average velocity?
Answer:
8.4375m a second
Explanation:
Again, this is such an easy question that I see everywhere. The way to figure this out is to divided the total distance he or she covered, which was 27m, by the time it took him or her to do so, which was 3.2s, so the equation is 27 divded by 3.2 which is 8.4375.
Hope this helps and have a great day.
Answer:
8.44 m/s
Explanation:
Averag v = distance/time
= 27m/3.2s
= 8.44 m/secs
3000 N is exerted for 4.0 seconds on a 9500 kg object a) What is the impulse impacted on the object
Answer: 12000 kg m/s
Explanation:
According to the Impulse-Momentum Theorem, we have:
[tex]F \Delta t= \Delta p[/tex]
Where:
[tex]F=3000 N[/tex] is the exerted force
[tex]\Delta t=4 s[/tex] is the time interval
[tex] \Delta p[/tex] is the change in momentum or impulse
Then:
[tex](3000 N)(4 s)= \Delta p[/tex]
[tex]\Delta p=12000 kg m/s[/tex] This is the impulse impacted on the object
Which type of change occurs when the bonds between atoms or molecules change and a new substance forms?
A: Permanent
B: Nuclear
C: Chemical
D: Physical
Answer:
C: Chemical
Hope this help !!!!
C. Chemical
~Sarah Robinsen
A stunt man is attempting to ride his bike through the loop of a track. The
combined mass of the stunt man and his bike is 101 kg. (a) If the radius of
the loop is 10.1 m and he is traveling at 22.5 m/s, what is the normal force
from the track when he is at the top of the loop?
(b.) What is the minimum speed the stunt man can be traveling and still
make the loop?
Answer:
(a) 4070 N
(b) 9.95 m/s
Explanation:
(a) Draw a free body diagram of the stunt man when he is at the top of the loop. There are two forces: normal force N pushing down and weight force mg pulling down.
Sum of forces in the radial (-y) direction:
∑F = ma
N + mg = m v² / r
N = m v² / r − mg
N = (101 kg) (22.5 m/s)² / (10.1 m) − (101 kg) (9.8 m/s²)
N = 4070 N
(b) At the minimum speed, there is no normal force at the top of the loop.
∑F = ma
mg = m v² / r
g = v² / r
v = √(gr)
v = √(9.8 m/s² × 10.1 m)
v = 9.95 m/s
John pushes his bed to the left overcoming the force of friction. On the free-body diagram below, which force represents the friction force on the bed?
A. Force A
B. Force B
C. Force C
D. Force D
Answer:
Force B
Explanation:
Friction Force
It's a force that appears when an object is tried to move on a rough surface. There are two cases: when the object is at rest, we have the friction static coefficient and when the object is already moving, we have the dynamic coefficient. The static coefficient is usually greater than the second because it's harder to overcome the friction when the object is at rest.
We are told that John pushes the bed to the left with enough force to overcome the force of friction. If the movement is intended to be to the left side, the friction force appears to the right, since it always opposes to the movement. Thus the force B is the one who represents the friction force in this situation
How can electric shock be prevented?
Wearing rubber or stay away from water or/ and a conductor
Which title best reflects the main idea of the passage? The Role of Convection in the Distribution of Earth's Energy The Role of Heat Transfer Methods in the Distribution of Earth's Energy Conduction, Convection, and Radiation: Methods of Heat Transfer Conduction, Convection, and Radiation: The Heating Up of Earth's Surface
Answer:
b
Explanation:
The main idea can be the Role of Heat Transfer Methods in the Distribution of Earth's Energy.
What is main idea of a passage?The main idea of a passage is the central message or information the author is trying to pass to the audience.
The main idea of a passage is the author's main purpose of writing the passage.
From the given options, the main idea of the passage can be determined if the central message of the passage can be deduced.
The main idea can be "The Role of Heat Transfer Methods in the Distribution of Earth's Energy"
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what is thermal physics
Answer:
Thermal physics is the combined study of thermodynamics, statistical mechanics, and kinetic theory of gases. This umbrella-subject is typically designed for physics students and functions to provide a general introduction to each of three core heat-related subjects. Other authors, however, define thermal physics loosely as a summation of only thermodynamics and statistical mechanics.
Explanation:
Final answer:
Thermal physics is a branch of physics focused on energy transfer and the behavior of particles in relation to heat, including study areas like thermochemistry and thermodynamics. It encompasses thermal agitation, heat transfer, and laws of energy conservation.
Explanation:
Thermal physics is an area of physics that deals with the energy transfer, thermal properties of materials, and the behavior of particles related to heat. It encompasses topics such as thermochemistry, the laws of thermodynamics, and thermal agitation. Thermal agitation refers to the random motion of atoms and molecules in any object with a temperature above absolute zero, resulting in the emission and absorption of radiation. In essence, thermal physics explores how thermal energy, or the kinetic energy of particles, flows and changes within systems. Thermal energy is a form of kinetic energy at the microscopic scale, crucial in understanding heat transfer, and how it influences work and energy conservation.
At the macroscopic level, thermal physics analyzes how heat transfer affects the internal energy of systems, aligning with Big Ideas from the AP Physics Curriculum Framework. Heat transfer describes energy movement from a hotter object to a cooler one, leading to temperature variations and potential work, exemplified by heat engines. Fundamental laws of physics, including the law of conservation of energy, govern these thermal interactions and their efficiencies.
Twenty students in Class A and 20 students in Class B were asked how many hours they took to prepare for an exam. The data sets represent their
answers
Class A (2,5,7,6,4,3,8.7.4,5,7,6,3,5, 4.2.4.6.3.5)
Class B. (3.7.6. 4.3.2.4,5,6,7.2.2.2.3, 4.5, 2, 2.5,6)
Which statement is true for the data sets?
A.
The mean study time of students in Class A is less than students in Class B.
B.
The mean study time of students in Class B is less than students in Class A
C.
The median study time of students in Class B is greater than students in Class A
D.
The range of study time of students in Class A is less than students in Class B
E.
The mean and median study time of students in Class A and Class B is equal
The answer from the given option is The mean study time of students in class B is less than the students in class A.
Explanation:
Mean is defined as the ratio of the sum of the given terms to the number of the given terms. (i.e. sum divided by the count). In short, it is the average of the number.There are three types of mean:
Arithmetic mean(AM), Geometric mean(GM)Harmonic mean(HM).Here in class A,
Mean in class A = (2+5+7+6+4+3+8+7+4+5+7+6+3+5+4+2+4+6+3+5) / 20
= 4.8.
Mean in class B = (3+7+6+4+3+2+4+5+6+7+2+2+2+3+4+5+2+2+5+6) / 20
= 4.
Hence mean study time of class B is less than the mean study time of class A.
Why should antibiotics be given to a person who is ill with a bacterial disease like strep throat, but NOT to a person who has a viral disease like measles?
Antibiotics kill bacteria but not viruses.
Antibiotics make viruses grow faster.
Antibiotics are made by viruses.
Viruses are not living things.
If you guys dont mind can you please help me with this one
Answer:
b
Explanation:
antibiotics are made with viruses so that ou body can get immune to the virus
you are trying to figure out the voltage of a battery when you know the current and the resistance. the current(i) is 25 Amps, and the resistance (R) is 10 ohms. Use the right form of I=VIR
Answer:
V= 250 volts
Explanation:
V=IR
V=25*10
V=250 volts
Answer: 250 V
Explanation: Ohm's Law is expressed in the given equation:
V = I x R
Substitute the values of I ( current) and R ( resistance)
V = 25 A x 10 ohms
= 250 V
plsss help me asap
(03.05 LC)
Which statement best describes the long–term effects of using non–renewable resources? pls explain how u know
Select one:
a. Burning fossil fuels pollutes the environment.
b. Fossil fuels burn clean, reducing air pollution.
c. As populations increase, the need for solar power will decrease.
d. Resources will replenish over the long term to be used again.
Answer:
A.)
Explanation:
The answer would be A. because when they are burned, they release harmful pollution into the air causing the environment to be polluted by them.
It can't be B because it is saying the opposite which is false.
It is not C because solar power is a renewable resource not non-renewable like the question asked.
It is also not D because a non-renewable resource is one that cannot be replaced but this is saying that they can be replaced which is incorrect.
The answer would be A.
A 5.5 kg box is pushed across the lunch table. The net force applied to the box is 9.7N. What is the acceleration of the box?
Answer:
1.76 m/s^2
Explanation:
mass of box, m = 5.5kg
net force , F = 9.7N
acceleration = ?
F = m x a
a = F/m = 9.7/5.5
a = 1.76 m/s^2
type 2 diabetes runs in familes, but its frequency has been rising in recent years. what factors might explain this increase in type 2 diabetes?
Answer:
poor diet andlack of exersise
Explanation:
why is electric switches and boards are made up of plastic
Answer:
so that they don't calch fire
A 5 kg book rests on a table. How much force is it exerting on the table?
(Hint: think about acceleration due to gravity.)
Answer:
49N
Explanation:
Basically, think of this problem as asking how much the book weighs, as that is all weight is, how much force you exert on whatever surface you're on.
Thus, the force due to gravity Fgrav = mg = 5 * 9.8m/s^2 = 49N.
The force will be "49 N". A complete solution is provided below.
According to the question,
Mass of books,
m = 5 kg
We know the value,
g = 9.8 m/s⁻¹
Now,
The force exerting on the table, will be:
→ [tex]F = mg[/tex]
By substituting the given values in the above formula, we get
→ [tex]=5\times 9.8[/tex]
→ [tex]=49 \ N[/tex]
Thus the above answer is correct.
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2. 30 Newton Meters of torque is required to close a door 1.5 meters wide. What force is needed to cause the
correct amount of torque?
Answer:
A
Explanation:
Figure P2.23 is a somewhat simplified velocity graph for Olympic sprinter Carl Lewis starting a 100 m dash. Estimate his acceleration during each of the intervals A, B, and C.
A) Acceleration in part A: [tex]6.1 m/s^2[/tex]
B) Acceleration in part B: [tex]2.7 m/s^2[/tex]
C) Acceleration in part C: [tex]1.5 m/s^2[/tex]
Explanation:
A)
The picture of the problem is missing: find it in attachment.
The acceleration of a body is equal to the rate of change of its velocity:
[tex]a=\frac{v-u}{\Delta t}[/tex]
where
v is the final velocity
u is the initial velocity
[tex]\Delta t[/tex] is the time it takes for the velocity to change from u to v
In part A of the race, we have:
u = 0
v = 5.5 m/s (estimate)
[tex]\Delta t = 0.9 - 0 = 0.9 s[/tex]
So the acceleration is
[tex]a=\frac{5.5-0}{0.9}=6.1 m/s^2[/tex]
B)
In part B of the race, we have:
u = 5.5 m/s is the initial velocity (estimate)
v = 9.5 m/s is the final velocity (estimate)
[tex]\Delta t = 2.4 - 0.9 = 1.5 s[/tex] is the time interval between the two points considered
Therefore, using the equation for the acceleration, we can find the acceleration in part B:
[tex]a=\frac{9.5-5.5}{1.5}=2.7 m/s^2[/tex]
C)
In part C of the race, we have:
u = 9.5 m/s is the initial velocity (estimate)
v = 11 m/s is the final velocity (estimate)
[tex]\Delta t = 3.4 - 2.4 = 1 s[/tex] is the time interval between the two points considered
And therefore, the acceleration in part C of the race is:
[tex]a=\frac{11-9.5}{1}=1.5 m/s^2[/tex]
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if a swimmer is traveling at a constant speed of 0.85 m/s how long would it take to swim the length of 50 meter olymic sized pool
Answer:
58.82 Seconds
Explanation:
50m/0.85m/s=58.82s
A football player kicks a 0.94 kg football with a force of 2.4 N.
Calculate the acceleration of the football as the player kicks the ball. Round your answer to the nearest tenth of a m/s2.
The acceleration of the football is
m/s2.
Answer:
The Answer is 2.6m/s(m/s)
Explanation:
Just took the test!
Answer:
2.6 m/s2............................
Briefly describe the two different categories of mechanics:
Answer:
Statics which is when dealing with forces acting out on body and the possible motives of the body system. Kinetics which explains the motion that can occur in any type of situation.
Explanation:
Suppose that an object slows down while moving horizontally. In this situation, the
object's kinetic energy would _, its potential energy would _, and its total
mechanical energy would
Enter the three answers in their respective order without any commas or spaces between
letters.
a. Increase
b. Decrease
c. Remain the same
d. Nonsense! It is impossible to tell without more information.
Suppose that an object slows down while moving horizontally. In this situation, the object's kinetic energy would _,(decrease )---- its potential energy would (increase) and its total mechanical energy would (remains the same) .
Explanation:
Energy
It is ability to do work
It is of different types out of which mechanical energy is also one of the type .
Mechanical energy
It is the energy possessed by body due to its position or motion .
It is of two types :
Kinetic energy
Potential energy
Potential energy
It is the energy possessed by body due to its position or state .
It is given by P.E =mx gx h
Kinetic energy
It is the energy possessed by body due to its motion .
It is given by K.E=1/2 mv²
Law of conservation of energy
It states that energy can be converted from one form to another but total energy of the system remains same .
That is why : in above asked question ,when body is moving it has kinetic energy , when stops the kinetic energy gets converted to potential energy , but the total energy of system remains same .
The object's kinetic energy would decrease, its potential energy would increase, and its total mechanical energy would remain the same.
The total mechanical energy (E) of a system is the sum of its kinetic energy (KE) and its potential energy (PE).
E = KE+ PE
conservation of energy:
whenever an object is acted upon by a non-dissipative conservative force its total mechanical energy remains conserved.
So, when the object slows down, its velocity decreases, and therefore its kinetic energy decreases. Since the total mechanical energy remains conserved, the loss in kinetic energy is converted into gain in potential energy, and the potential energy increases.
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If you wanted to be an auto mechanic for Toyota, where would you go to school to get that training? How much would you make your first year?
Thus, an object with a momentum of 0 (does or does not have
kinetic energy.
If an object has a momentum of 10 it (does or does not) have
kinetic energy.
How do you know?
Answer:
At momentum zero, kinetic energy = zero
At momentum 10, kinetic energy can never be equal to zero.
Explanation:
An object is said to have zero momentum when either its mass or its velocity is zero. Since, negetive mass doesn't exist, the velocity should be zero and this case, the object must be at rest. Momentum is zero when change in velocity is zero, but kinetic can never be zero when body is motion or has a momentum of 10.
what are 2 examples of levers
Answer:
Some examples of levers include more than one class, such as a nut cracker, a stapler, nail clippers, ice tongs and tweezers. Other levers, called single class levers include the claw end of a hammer.
Explanation:
Answer:
Some examples of levers include more than one class, such as a nut cracker, a stapler, nail clippers, ice tongs and tweezers. Other levers, called single class levers include the claw end of a hammer.
Explanation:
A missle is fired horizontally with an initial velocity of 45 m/s from the top of a building 75 m high.
What is the horizontal range of the missle?
Select one:
a. 125 m
b. 176 m
c. 207 m
d. 689 m
The horizontal range of the missile is b) 176 m
Explanation:
The motion of the missile is a projectile motion, so it consists of two independent motions:
- A uniform motion with constant velocity along the horizontal direction
- A uniformly accelerated motion with constant acceleration (equal to the acceleration of gravity) in the vertical-downward direction
To find the time of flight of the missile, we study the vertical motion. We can use the following suvat equation:
[tex]s=u_y t+\frac{1}{2}at^2[/tex]
where:
s = 75 m is the vertical displacement of the missile (the height of the building)
[tex]u_y=0[/tex] is the initial vertical velocity (the missile is thrown horizontally)
t is the time of flight
[tex]a=g=9.8 m/s^2[/tex] is the acceleration of gravity
Solving for t, we find the time of flight:
[tex]t=\sqrt{\frac{2s}{g}}=\sqrt{\frac{2(75)}{9.8}}=3.91 s[/tex]
This means that the missile takes 3.91 s to reach the ground.
Now we study the horizontal motion: the missile moves with a constant horizontal velocity of
[tex]v_x = 45 m/s[/tex]
Therefore, the distance covered in a time t is
[tex]d=v_x t[/tex]
and by substituting t = 3.91 s, we find the horizontal range of the missile:
[tex]d=(45)(3.91)=176 m[/tex]
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