Answer:
A roller coaster starts from rest at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip?
a. 17 m/s b. 24 m/s c. 14 m/s d. 30 m/s
You have no mass given, so you work it cancelling the mass:
i'll take g = 9.8 m/s^2
(g x h1) - (g x h2) = 1/2v^2 ( no mass either for KE)
(9.8 x 45) - (9.8 x 30) = 147
147 x 2 = v^2 = 294, sq-rt = v = 17.146 m/s answer (17m/s)
A roller coaster starts with a speed of 5.0 m/s at a point 45 m above the bottom of a dip (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 30 m above the bottom of the dip? a. 16 m/s b. 12 m/s c. 14 m/s d. 18 m/s
u^2 = 2gh (5^2 = 2gh)
25/(2g) = h = 1.2755 m
45 + 1.2755 = 46.2755m
Do the same equations as question one, answer = 17.86 m/s (answer 18 m/s)
A roller coaster starts at a point 30 m above the bottom of a dip with a speed of 25 m/s (See Fig. 6-2). Neglect friction, what will be the speed of the roller coaster at the top of the next slope, which is 45 m above the bottom of the dip? a. 14 m/s b. 16 m/s c. 20 m/s d. 18 m/s
Do the same! 25^2 = 2gh, 625/(2g) = h = 31.89 m
31.89 + 30 = 61.89 m
(9.8 x 61.89) - (9.8 x 45) = 1/2v^2 = 165.52
165.52 x 2 = 331.04, sq-rt = 18.19 m/s (answer 18 m/s)
A horizontal force of 200 N is applied to move a 55-kg cart (initially at rest) across a 10 m level surface. What is the final speed of the cart?
a. 73 m/s b. 6.0 m/s c. 36 m/s d. 8.5 m/s
Ignoring friction:
F = ma
200/55 = a = 3.636 m/s^2
v^2 = u^2 + 2as, u^2 = zero
v^2 = 2as
2as = 2 x 3.636 x 10 = 72.72, sq-rt = 8.52 m/s (answer 8.5 m/s)
Explanation:
What is "Motion?"
Any physical movement or change of position of an object
When an object is square
When An object is standing still
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In physics, motion is the phenomenon in which an object changes its position over time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, speed, and time. One can also speak of motion of images, shapes, and boundaries.
Movement of any object from one position to another position with respect to the observer is called as Motion. Motion Along a Straight Line: When an object moves along a straight line, the motion of the object is called rectilinear motion. For example; motion of a car on highway.
In physics, motion is the change in position of an object with respect to its surroundings in a given interval of time. Motion is mathematically described in terms of displacement, distance, velocity, acceleration, and speed. An object's motion cannot change unless it is acted upon by a force.
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Hope It Helps!
It will still move
11. Would you expect sound to travel faster in a solid, liquid, or gas? Explain.
which health related components give you a normal or an above average classification?
answer:
cardiovascular endurance
muscular strenght
muscular endurance
body composition
flexibility
Explanation:
hope it helps(◍•ᴗ•◍)❤
The lower the efficiency of a ____, the ______ the percentage of energy that is degraded tp _____ energy.
Answer:
Machine; greater; thermal.
Explanation:
Conduction can be defined as the transfer of electric charge or thermal energy as a result of the movement of particles. When the conduction relates to electric charge, it is known as electrical conduction while when it relates to thermal energy, it is known as heat conduction.
In the process of heat conduction, thermal energy is usually transferred from fast moving particles to slow moving particles during the collision of these particles. Also, thermal energy is typically transferred between objects that has different degrees of temperature and materials (particles) that are directly in contact with each other but differ in their ability to accept or give up electrons.
Mathematically, the efficiency of a machine is given by the formula;
[tex] Efficiency = \frac {Mechanical \; advantage}{Velocity \; ratio} * 100 [/tex]
Hence, the lower the efficiency of a machine, the greater the percentage of energy that is degraded to thermal energy. We experience inefficiency in machines due to the fact that energy are being transformed or converted from one form to another.
PLS HELP
1.) When there are equal forces from opposite directions acting on an object, the forces are said to be which of the following? (4 points)
A.) Positive
B.) Negative
C.) Balanced
D.) Gravitational
2.) If you want to cause an object to move, what should you do? (4 points)
A.) Apply balanced forces.
B.) Apply neutral forces.
C.) Apply potential forces
D.) Apply unbalanced forces.
Answer:
B
Explanation:
Amoeba have mitochondria. What is the name of the process that breaks down glucose sugar into usable energy for the cell? (2 words)
Answer:
cellular respiration
Explanation:
state why a lubricant reduces friction in the bearings of moving part of a machine
Answer:
Due to reduced friction of a polished ,smooth slide, children can slide down easily. When oil or grease is applied between the moving parts of a machine ,a thin layer of oil or grease is formed between the two rubbing surfaces. ... This friction is reduced and movement becomes smooth.
Explanation:
please give me brainlist and follow
PLEASE HELP ILL GIVE CROWN!!!!!!!!!!!!!!!
the farther you live from an ocean, the more likely you will have...
A ) Little to no temperature change from summer to winter.
B ) A tropical climate
C ) Extreme temperature differences in summer and winter
D ) An Arctic climate
Answer:b
Explanation:
took test, might be wrong
Answer:
C ) Extreme temperature differences in summer and winter
Explanation:
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what is the couple force
Explanation:
a couple is a system of forces with a resultant moment but no resultant force. A better term is force couple or pure moment. Its effect is to create rotation without translation, or more generally without any acceleration of the centre of mass.
help me please its due in ten minutes
Answer:
relative age
Explanation:
i remember this test
L
2/ If a large force is exerted on an object, when is
no work performed?
A. when the object moves
B. when the object does not move
C. when the power is too large
D. when there is no friction
Please answer fast
A 50 kg boy jumps off the front of a 1.5 kg skateboard moving forward. Find the skateboard's velocity
immediately after the boy jumps, assuming that the skateboard's initial velocity is 3.5 m/s and the boy's
velocity when jumping off the front is 5 m/s?
Answer:
The speed is 1.35 m/s
Explanation:
(m1+m2) vi= m1+m2v2
(50+1.5) (3.5)=50 (5+v2) +1.5 v2
180.25= 250+ 51.5 v2
180.25- 250+ 51.5 v2
-69.75= 51.5 v2
v2= -1.35 m
Why is it not suitable to determine the volume of an irregular charcoal using displacement method
Answer:
Displacement method of volume measurement is no suitable
Explanation:
Displacement method of volume measurement is no suitable for the objects that do not get immersed into the water completely because of the hindrance in accuracy of the measurement.
Mechanical efficiency is a comparison of a machines work output with the work input. True or False?
A cart with an initial velocity of 5.0 m/s experiences a constant acceleration of 2.0 m/s2. What is the cart's displacement during the first 6.0 s of its motion? *
please help me .........................
Answer:
Dog2 has most kinetic energy .
B:324j
How many calories would you take in if you ate the whole box of crackers in one sitting ?
Answer:
i'm pretty sure it's 81 calories
Which situation would create a field like the one shown here?
A. interaction between two magnetic south poles
B. interaction between two magnetic north poles
C. interaction between a south pole and a north pole
D. interaction between a magnetic south pole and a copper bar
Answer:
C
Explanation:
We don't need to know which pole is in the bars. We just need to see that the lines of the magnetic field, represented by the iron filings, are leaving one bar and joining another - we don't need to know which bar is. To do that, we should define what is the North Pole, where the lines leave, and what is the South Pole, where the lines go.
If we had equal poles, the lines would be pointing out the bars like that <<<< BAR >>>>>
<<<<<BAR>>>>>
not joining one or another.
An electric motor is used to lift a load. When 7000 J of electrical energy are supplied to the motor the load gains 3100 J of gravitational potential energy. The amount of wasted energy by the motor is
Answer:
W = 3900 J
Explanation:
Given that,
Electrical energy supplied = 7000 J
Gain in gravitational potential energy = 3100 J
We need to find the amount of wasted energy. Let it is W. So,
W = 7000 J - 3100 J
= 3900 J
So, the amount of wasted energy by the motor is 3900 J.
Pleas answer if you want brainliest I need help fast
Nolan is making a capacitor using plates that have an area of 3.2 × 10–4 m2 separated by a distance of 0.20 mm. He has the two dielectrics listed in the table.
table:
dielectirc 1= dielectric constant 6.8
dielectric 2= dielectric constant 1.5
At a voltage of 1.5 V, how much more charge can Nolan store in the capacitor using dielectric 1 than he could store using dielectric 2?
answer choices:
7.5 × 10^–11 C
9.6 × 10^–11 C
1.1 × 10^–10 C
1.4 × 10^–10 C
Answer: 1.1 x 10^-10 C
Explanation:
Answer:
1.1 x 10^-10 C
Explanation:
on edg 21
plzzzzz help me promise will mark you brainiest
Answer:
c. 300 J
Explanation:
Given
Power (p) = 10 W
Time (t) = 0.5 minutes = 30 seconds
Energy (E) = ?
We know
p = E/t
10 = E / 30
E = 300 Joule
plsss help me
what factors affect electrostatic force?
Answer:
The first factor is the amount of charge on each object. The greater the charge, the greater the electric force. The second factor is the distance between the charges. The closer together the charges are, the greater the electric force is.
Explanation:
When you increase the volume with constant temperature, what happens
to the pressure?
- increases
- decreases
- stays the same
Answer:
Pressure increases
Explanation:
"Gay Lussac's Law - states that the pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature. If you heat a gas you give the molecules more energy so they move faster. This means more impacts on the walls of the container and an increase in the pressure."
How many atoms are in 3MgCl2?
Answer:
3MgCl2 has 9 atoms.
Explanation:
The Element Magnesium (Mg) has 3 atoms.
The Element Chloride (Cl) has 6 attoms.
Their fore 6 + 3 is 9 of course. 3MgCl2 has 9 atoms.
BTW: 3MgCl2 is a molecular compound as well as H2O and CO2.
Camina con otro compañero, al mismo tiempo y al mismo paso. Quién se mueve tú o tu compañero? Razona tu respuesta
Answer:
Fricción.
Explicación:
Caminando con otro compañero al mismo tiempo y al mismo ritmo, el movimiento se produce debido a la fricción del suelo y la suela de los zapatos porque la fricción es la fuerza que ayuda en el movimiento de los objetos de un lugar a otro. Si no hay fricción entre el suelo y la suela de los zapatos, no podemos dar un paso por lo que podemos decir que la fricción nos mueve hacia adelante.
List the 3 formulas for Speed, Distance, and Time
5. Aunt Jane weighs 145 pounds. What is her weight in Newtons?
Answer:
i think its 644
Explanation:
i need major help !
Write a hypothesis for a way to make a wave disappear.
Answer:
A new theoretical design using nanowires provides a way to hide ... But to make things truly disappear before our eyes, a way will need to be ...
Shh! Computer simulations predict that certain materials could allow sound waves to pass by undisturbed, effectively making them acoustically ...
Explanation:
A student observes a model of two bonded atoms. She is told that both atoms are nonmetals. Which of the following is a valid conclusion?
A. The student is looking at a model of atoms held together by a covalent bond.
B. The student is looking at a model of a metalloid.
C. The student is looking at a model of a crystal lattice.
D. The student is looking at a model of atoms held together by an ionic bond.
Answer:A
Explanation: it’s a covalent bond plus i just took mines
Two magnets are arranged so that they pull together. Which conclusion can be reached? A.Two north poles are together. B. Two south poles are together. C. The poles of the magnets are touching. D. A north pole is near a south pole.
Answer:
Answer is D. a north pole is near a south pole
Explanation:
Hope this helps!! :D