Answer:24/225
Explanation:density =mass/volume
A snowball that will be used to build a snowman is at the top of a only hill. If the
potential energy of the snowball is 520 J and the mass of the snowball is 2.2 kg,
what is the height of the hill?
Answer:
h = 24.11 m
Explanation:
Given that,
The potential energy of the snowball is 520 J
The mass of the snowball is 2.2 kg
We need to find the height of the hill. The potential energy of an object is given by the formula as follows :
[tex]E=mgh[/tex]
g is acceleration due to gravity
h is height of the hill
[tex]h=\dfrac{E}{mg}\\\\h=\dfrac{520}{2.2\times 9.8}\\\\h=24.11\ m[/tex]
So, the height of the hill is 24.11 m.
2
The graph represents the movement of a body.
10
speed
m/s
8
6
4
N
0-
0 1 2 3 4
time, s
How far has the body moved after 5s?
A 2 m
B 10 m
C 25 m
D 50m
Answer:
D
Explanation:
it's the speed of the body I think
A light source radiates 60.0 W of single-wavelength sinusoidal light uniformly in all directions. Find the amplitude of the electric field of this light at a distance of 0.400 m from the bulb
Answer:
E = 149.92 N/C
Explanation:
Given that,
The power emitted by a sinusoidal light is 60 W
Intensity is equal to the power per unit area. It can be given by :
[tex]I=\dfrac{P}{4\pi r^2}\\\\I=\dfrac{60}{4\pi \times (0.4)^2}\\\\I=29.84\ W/m^2[/tex]
The relation between the amplitude of the electric field and the intensity is given by :
[tex]I=\dfrac{E_o^2c \epsilon_o}{2}[/tex]
Here, [tex]E_o[/tex] is the amplitude of the electric field
[tex]E_o=\sqrt{\dfrac{2I}{c\epsilon_o}} \\\\E_o=\sqrt{\dfrac{2\times 29.84}{3\times 10^8\times 8.85\times 10^{-12}}}\\E_o=149.92\ N/C[/tex]
So, the amplitude of the electric field is 149.92 N/C.
A hockey puck moves 26 meters northward, then 12 meters southward, and finally 6 meters northward what is the distance and the displacement? PLEASE HELP MEEE
Answer:
The displacement is 20 m northward.
The distance is 44 m
Explanation:
Let northward motion be in positive direction
Let southward motion be in negative direction
Dispalcement is the shortest path covered by the hockey puck at a specified direction.
The dispalcement of the hockey puck will be calculated as;
Displacement = 26 m northward - 12m southward + 6 m northward
Displacement = 20 m in northward direction
Distance is the total path covered by the hockey puck.
Distance = 26 m + 12m + 6 m
Distance = 44 m
Answer:
The displacement is 20 m northward.
The distance is 44 m
Explanation:
A scientist heats a piece of iron until it is glowing white–hot. He places the metal inside a metal box. He removes all of the air from the inside of the box. After a few seconds, the sides of the box that are not touching the metal begin to feel warm. Which process is most likely responsible for the warming?
Convection
Convection current
Radiation
Evaporation
Answer:
The answer is Radiation.
Explaination:
A and B are wrong because you can't have convection or convection currents without air, and all the air has been removed from the box.
D is wrong because there is no liquid in the box.
C is correct because heat can be transmitted even through a vacuum by radiation (e.g., the Sun). You can quickly feel the heat radiated by a piece of white-hot iron.
The equation for distance is d = st i. If a car has a speed of 22.3 m/s and drives for 8.5 seconds, how far does it go? (1 point)
distance(d) = speed(s) × time (t)
= 22.3 × 8.5
= 189.55m
Ceiling-suspended paddle fans must not be located within a zone measured ____ horizontally and ____ vertically from the top of the bathtub rim or top of a shower stall threshold.
Which is directly proportional to your weight on a planet's surface?
Answer:
Weight is directly proportional to our mass and acceleration due to gravity of that planet
Answer:
Your mass and the mass of the planet
A cross-country skier moves 36 meters eastward, then 44
meters westward, and finally 22 meters eastward.Whats the Magnitude and Direction?
Answer:
Magnitude = 14 metres
Direction = eastward.
Explanation:
A cross-country skier moves 36 meters eastward, then 44meters westward, and finally 22 meters eastward.
Whats the Magnitude and Direction?
The magnitude and direction will be the displacement of the cross country skier.
Let the east ward be positive and the west ward be negative.
Since the skier moves 36 meters eastward, then 44meters westward, and finally 22 meters eastward. Then, that will be:
36 - 44 + 22 = 14
Since the answer is positive, the magnitude is 14 and the direction is east ward.
Below are steps of a work out from warm up steps through the cool down. Place steps in order from 1 being the first thing to do when starting a session to 5 being the last part. Question 1 options: 2 Static stretches held for 10 seconds each stretch to loosen up. 1 Light jog to get heart rate up for about 5 minutes. 4 Activity specific drills such as high knees, butt kicks, skipping, grapevines. 5 15-45 minute exercise or sport activity. 3 Walk to bring heart rate down, followed by stretches held for as long as 30 seconds.
Answer:
1: Light jog to get heart rate up for about 5 minutes
2: Static stretches held for 10 seconds each stretch to loosen up.
3: Activity specific drills such as high knees, butt kicks, skipping, grapevines.
4: 15-45 minute exercise or sport activity.
5: Walk to bring heart rate down, followed by stretches held for as long as 30 seconds.
Warming up and cooling down are essential steps to a good exercise routine. However, it is important to know the correct moment where each of these activities should be performed.
Based on this, we can consider that the correct steps are:
Light jog to get heart rate up for about 5 minutes Static stretches held for 10 seconds each stretch to loosen up. Activity specific drills such as high knees, butt kicks, skipping, grapevines. 15-45 minute exercise or sport activity. Walk to bring heart rate down, followed by stretches held for as long as 30 seconds.With that in mind, we can conceptualize Warming Up and Cooling Down as follows:
Warming Up: Prepares the body for the exercise that will start, allowing the intensity of the exercise to be gradually increased. This allows for good physical stamina and a gradual increase in heart rate.Cooling down: Allows a gradual relaxation, while physical activity loses intensity and the body prepares to stop exercising. In addition, relaxation allows the body to eliminate lactic acid from the musculature, which has accumulated during exercise. This prevents the existence of cramps.Thus, we can conclude that warming up and cooling down is essential for a good physical exercise routine, as it allows for the optimization of exercise and prevents injuries to the body.
You can find more information about this at the link below:
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1.
Newton's laws refer to a particle and relate the forces acting on the particle with its acceleration are
(True/False)
Answer:
true
Explanation:
Newton is the measure of the force with turns to be gravity multiplying the mass. Thus, the forces acts on the particles in the direction of the movement of the particles
Which statement is true about acceleration?
Ο Α.
It is the rate of change of speed per unit time.
B.
It is the rate of change of displacement per unit time.
O C.
It is the rate of change of velocity per unit time.
O D.
It is the rate of change of position per unit time.
Answer
A
Explanation:
It is the rate of change of speed per unit time
1.) Will an objects
motion change if the net
force on the object is
2N? Why or Why not?
Explanation:
Yes, because the object will move to the right
Answer:
Explanation:
Sometimes.
Sometimes not.
If the surface is frictionless, and the mass is 5 kg and the object is on a table, then likely 2 N will be enough to get it going.
If the object is on a table that needs a sandpaper/stain finish, then likely the 5 kg object will not overcome the rough surface of the table and there will likely not be any motion.
If the force is 2N and the object is on a frictionless surface and the object is a 1000kg mass, there might be motion but inertia would certainly be hard to overcome and I doubt there would be motion on planet earth.
2N is just not a very big force.
which solid state component allows a mobile phone to store data even if the battery is removed
Answer:
The capacitor helps to store data even after the battery is removed
Explanation:
The cell phone is fitted with different types of capacitors, which come in all shapes and sizes. However they come, their main function is to store charges within them, and dissipate these charges when necessary.
This serves a great purpose in the printed circuit boards of phones as they provide the power needed for data to be stored even when the battery of the phone is removed.
A capacitor is a solid-state device because it has no moving part. It just stores charges within its parallel plates for the phone until the power is needed.
A coil of wire is connected to a galvanometer and the north end of a magnet moved towards the center of the coil causing the needle on the galvanometer to deflect. If the south pole of a magnet is moved away from the center of the coil the needle on the galvanometer would deflect in the same direction.
a. True
b. False
Answer:
a. True
Explanation:
In electromagnetic induction, the induced current always try to oppose the action that produces the induction (Lenz law). The approaching north end of the magnet will induce a current on the coil that will flow in an anticlockwise direction in the current (which induces a magnetism with the equivalent of a north pole of a magnet). The action of this induced current repels the magnet, in an effort to stop the motion that is producing the electromagnetic induction. When we also move the south pole of the magnet away from the coil, it induces an anticlockwise current in the coil, which tries to attract the south pole of the magnet so as to prevent it from moving. So both actions produce currents that flow in the same direction, which means that the needle of the galvanometer will deflect in the same direction.
Answer:
a. True
Explanation:
In electromagnetic induction, the induced current always try to oppose the action that produces the induction (Lenz law). The approaching north end of the magnet will induce a current on the coil that will flow in an anticlockwise direction in the current (which induces a magnetism with the equivalent of a north pole of a magnet). The action of this induced current repels the magnet, in an effort to stop the motion that is producing the electromagnetic induction. When we also move the south pole of the magnet away from the coil, it induces an anticlockwise current in the coil, which tries to attract the south pole of the magnet so as to prevent it from moving. So both actions produce currents that flow in the same direction, which means that the needle of the galvanometer will deflect in the same direction.
If friction is ignored and the ball is dropped, it experiences a gain in ____ and a decrease in ___. Question 8 options: kinetic energy; potential energy potential energy; kinetic energy thermal energy; potential energy potential energy; thermal energy
Answer:
My answer is when the ball is going it experience kinetic energy which is the energy of a moving object while when the ball has stopped then it will have potential energy which means it's at rest so for the ball not to experience friction then there is a gain in kinetic energy and decrease in potential energy.
Answer:
Gain in Kinetic energy and decrease in Potential energy.
Explanation:
What is kinetic energy ?The energy possessed to a body due to its motion is called kinetic energy.
K = [tex]\frac{1}{2} .m.v^{2}[/tex]
What is potential energy ?The energy possessed to a body due to its position is called potential energy.
[tex]U =mgh[/tex]
As the falls , due to pull of the Earth its velocity increase thus its kinetic energy also increases .As it falls , its height decrease from the Earth thus potential energy decrease.Hence in free fall , the ball experiences gain in kinetic energy and decrease in potential energy.
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what is the displacement if you walk 100m north, then 200m south, then 300m north
Answer:
200 m North
Explanation:
1. Let's represent north as positive and south as negative.
(100 m)+(-200 m)+(300 m)
= 200 m
2. Since the answer is positive, the units are 100 m NORTH since north represents positive.
A plastic bottle partially filled with water floats on water, even though the density of the plastic (1.2 g/cc) is more than that of water. Why is that?
Answer:
True the plastic will float because of the principle of flotation or buoyancy
Explanation:
Buoyancy explains it all!!
Buoyancy is the upward force/upthrust experienced by a body immersed totally or partially in a liquid.
According to the principle of flotation:
"when a body is totally or partially immersed in liquid it experiences an upthrust which is equal to the volume of fluid displaced"
The plastic will float due to the fact the average density of the total volume of the plastic and the air inside it is less than the same volume of water it is floating in
How much work is done (in L*atm) by a gas that expands from 7.6 liters to 24 liters against an external pressure of 3.4 atm?
Answer:
The work done by the gas is 55.76 L*atm.
Explanation:
The work can be found as follows:
[tex] W = p\Delta V = p(V_{f} - V_{i}) [/tex] (1)
Where:
p: is the pressure = 3.4 atm
V(f): is the final volume = 24 L
V(i): is the initial volume = 7.6 L
By replacing the above values into equation (1) we have:
[tex]W = p(V_{f} - V_{i}) = 3.4 atm(24 L - 7.6 L) = 55.76 atm*L[/tex]
Therefore, the work done by the gas is 55.76 L*atm.
I hope it helps you!
The bottle's mass is 0.2 kg. The diameter of its base is 10cm. How much pressure does the bottle exert on the table? A) 64 Pa B) 25 Pa C) 6.4 Pa D) 255 Pa
Answer:
D) 255pa
Explanation:
pressure= force/area
force = weight
weight= mass* gravitational acceleration
weight= 0.2kg*10m/s²
weight= 2N
area= πr² where r=1/2diameter
r=1/2diameter
r=1/2(10cm)
r=5cm or 0.05m
area= πr². where π 's approximate value is 3.14
area=3.14(0.05m)²
area=3.14 * 0.0025m²
area=0.00785m²
pressure= force/area
pressure=2N/0.00785m²
pressure=255pa approximately
Answer:
d 255 Pa
Explanation:
A boy rolls a toy car across a floor with a velocity of 3.21 m/s. How long does it take the car to travel a distance of 4.50 m?
Answer:
Time taken for the car to travel a distance of 4.50 m = 1.40 seconds
Explanation:
velocity of toy car = 3.21 m/s
distance travelled by toy car = 4.50 m
Time = ?
[tex]Velocity = \frac{Distance}{Time} \\Time =\frac{Distance}{Velocity}[/tex]
[tex]Time = \frac{4.50}{3.21} \\Time = 1.40s[/tex]
Therefore, the time taken for the car to travel a distance of 4.50 m = 1.40 seconds
Explain how skeletal muscles and nerves work together to help you move
2. The ant then travels from the 80.00 cm mark to the 10.00 cm mark. What is the
ant's total distance & displacement?
Answer:
The total distance traveled is 28 inches.
The displacement is 2 inches to the east.
I hope this helps :)
The answer answer it it la
Answer:
c) a tube light
Explanation:
a solar panel converts light energy into electricity
a tube light converts electricity into light
Imagine two planets, Planet A and Planet B, in a distant galaxy. Both planets have the same size but Planet A has more mass than Planet B. Two identical spacecrafts land on each of the planets. Which of the statements is true?
The weight of the spacecraft is greater on Planet A but the mass is the same on both planets
The mass of the spacecraft is greater on Planet A but the weight is the same on both planets
Both the mass and the weight are greater on Planet A.
Answer:
The weight of the spacecraft is greater on Planet A but the mass is same on both planets.
Mass is same on both planets because mass is always constant which means it doesn't change when place varies.Weight of the spacecraft is more in planet A because it has more value of acceleration due to gravity. (g=GM/R^2)
Thus the first statement is true
10 POINTS! FIRST TO ANSWER ****CORRECTLY**** GETS BRAINLIEST!
The state of California experiences periodic occurrences of higher than average precipitation. This causes flooding due to heavy rainfall.
Which weather phenomenon most likely causes this and why?
A. La Niña, because of weakening of trade winds
B. El Niño, because of weakening of trade winds
C. El Niño, because of strengthening of trade winds
D. La Niña, because of strengthening of trade winds
Answer:
The answer choice is C because La Nina Is the cooled part of the sea while El Nino is the warmed part of the sea.
Explanation:
You don't need to thank me... : )
A student rolls these four items on the same surface and at the same speed. Which item will have the greatest kinetic energy?
As per the four items given in the question, the speed of each object is the same, then the basketball will have the greatest kinetic energy.
What is kinetic energy?The force which a moving object has is referred to as kinetic energy in physics. It is defined as the number of effort required to propel a person of a specific mass from still to a specific velocity. Aside from slight fluctuations in speed, your body holds onto the kinetic energy it obtains during acceleration.
When the body slows down from its present level to a condition of rest, the exact same quantity of energy is used.
Formally, kinetic energy is any quantity that has a gradient with respect to time in the Lagrangian of a system.
As per the given information in the question,
As per the given items in the question, the basket ball will have the greatest kinetic energy because the kinetic energy is the product of mass and velocity and the mass of the basketball is greater than compared to the other objects.
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Your question is seems incomplete, probably the complete question is:
If a student rolls a marble, basketball, beach ball, and a table tennis ball on the same surface at the same speed, which will have the greatest kinetic energy?
1500 + 30.4 = ? Use the correct number of significant figures. plz plz help me
Answer:
1530.4?
Explanation:
1500.0
+030.4
1530.4
To protect her new two-wheeler, Iroda Bike
buys a length of chain. She finds that its
linear density is 0.83 lb/ft.
If she wants to keep its weight below 1.4 lb,
what length of chain is she allowed?
Answer in units of ft.
Answer:
The length of chain she is allowed is 1.169 ft
Explanation:
The given parameters are;
The linear density of the chain = 0.83 lb/ft
The weight limit of the chain she wants = 1.4 lb
The formula for linear density = Weight/length
Therefore, in order to keep the chain below 1.4 lb, we have;
Linear density = Weight/length
Therefore;
The maximum length she wants = Weight/(Linear density)
Which gives;
The maximum length she wants = 1.4 lb/(0.83 lb/ft) =1.169 ft
Therefore;
The length of chain she is allowed = 1.169 ft.
What is the dependent variable in an experiment testing the effects of pH on growth of a seed?
a
Seed growth
b
pH
c
Filter paper
d
Type of seed
The correct answer is A. Seed growth
Explanation:
Experiments often involve two main variables: the independent variable and the dependent variable. In an experiment, the dependent variable is always the main factor being studied; also, this is "dependent" because it is affected by other factors. In the case presented, the dependent variable is seed growth because this is the specific phenomenon that is being analyzed. Moreover, this factor is affected by the changes in pH. On the other hand, the pH, which is the second factor is the independent variable because this is not affected by the first variable and it is manipulated on purpose.