Answer: true
Explanation: when two objects collide and completely bounce apart with no lasting deformation or generation of heat, the collision is said to be elastic.
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When momentum is transferred from one object to another, their combined momentum remains the same. * True or False
Answer:
true
Explanation:
hope this helps
A girl tries to jump over a 0.825 m
wide creek by jumping at 3.87 m/s
at a 18.8° angle. What is her
height when she reaches the
other side of the creek?
What would be 1/2 times 800?
Answer:
The answer is 400
Explanation:
PLS HELP ASAP!! How many calories are required to melt a 10g ice cube which is at 0° C?
A. 10 cal
B. 800 cal
C. 80 cal
D. 540 cal
Answer:
800 calories are required to melt a 10g ice cube which is at 0 degrees C.
Explanation:
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Why do we use scatter plots for most data in Physical Science? Question 1 options: because the teacher said to use scatter plots because scatter plots show 100% of the data like a pie because scatter plots show the relationship between the independent and dependent variables because scatter plots show data for categories that do not overlap
Answer:
scatter plots show the relationship between the independent and dependent variables
Explanation:
A scatter plot is a graph which shows two variables plotted along two axes (usually the x and y axes). Scatter plots are useful in establishing any form of correlation between the dependent and independent variables in any study.
Correlation simply means the degree of relationship between variables, that is, how much does one variable affect the other? When scatter plots are almost a straight line graph, there is a high correlation between the variables. When the points in a scatter plot are isolated, there is little (sometimes zero) correlation between the variables.
At a circus, a human cannonball is shot from a cannon at 15m/s at an angle of 40° above horizontal. She
leaves the cannon 2m off the ground and lands in a net 1m off the ground. What height does she reach?
How much ground distance does she cover?
Answer:
a
The height is [tex]H = 6.74 \ m [/tex]
b
The horizontal distance is [tex]D = 23.74 \ m [/tex]
Explanation:
From the question we are told that
The speed is [tex]v = 15 \ m/s[/tex]
The angle is [tex]\theta = 40^o[/tex]
The height of the cannon from the ground is h = 2 m
The distance of the net from the ground is k = 1 m
Generally the maximum height she reaches is mathematically represented as
[tex]H = \frac{v^2 sin^2 \theta }{2 * g } + h[/tex]
=> [tex]H = \frac{(15)^2 [sin (40)]^2 }{2 * 9.8} + 2[/tex]
=> [tex]H = 6.74 \ m [/tex]
Generally from kinematic equation
[tex]s = ut + \frac{1}{2} at^2[/tex]
Here s is the displacement which is mathematically represented as
s = [-(h-k)]
=> s = -(2-1)
=> s = -1 m
There reason why s = -1 m is because upward motion canceled the downward motion remaining only the distance of the net from the ground which was covered during the first half but not covered during the second half
a = -g = -9.8
[tex]u = v sin (\theta)[/tex]
So
[tex]-1 = (vsin 40 )t + \frac{1}{2} * (-9.8) t^2[/tex]
=> [tex]-4.9t^2 + 9.6418t + 1 = 0[/tex]
using quadratic formula to solve the equation we have
[tex]t = 2.07 \ s[/tex]
Generally distance covered along the horizontal is
[tex]D = v cos (40) * 2.07[/tex]
=> [tex]D = 15 cos (40) * 2.07[/tex]
=> [tex]D = 23.74 \ m [/tex]
A baseball traveling at a velocity of 35 m/s has a mass of
0.15 kg. What is the kinetic energy of the baseball?
Answer:
35 m/s = v KE= 1/2 m x v^2. 89= m x 1224
89 J = KE 89 = 1/2 (m) x (35)^2. m = 0.15 kg.
Which property of air makes it effective in protecting firefighters?
The property of air which makes it effective in protecting firefighters is that it is a poor thermal conductor.
What is air?We define air as a mixture of gasses. We know that there a re several gases that are known to compose air and among these are oxygen, carbon dioxide, noble gasses and nitrogen.
We know that air is a poor conductor of heat. As such, air does not heat up quite easily and this would help to protect the fireman from getting burnt since air does not easily allow heat to pass through it as it were, this is why the firefighters depend on the insulative property of air.
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A piece of wood is measured to have 2 cm x 5 cm x 3 cm of volume. Its mass is 20.0 g. What is its density?
Answer:
[tex]\boxed {\tt \frac{2}{3} \ or \ 0.666666667 \ g/cm^3}[/tex]
Explanation:
Density can be found by dividing the mass by the volume.
[tex]d=\frac{m}{v}[/tex]
The mass is 20 grams.
We have to find the volume.
To find the volume, multiply the length by the width by the height. V= l*w*h l= 2 cm, w= 5 cm, h= 3 cmV= 2 cm * 5 cm * 3 cm = 30 cm³[tex]m= 20 \ g\\v= 30 \ cm^3[/tex]
Substitute the values into the formula.
[tex]d=\frac{20 \ g}{30 \ cm^3}[/tex]
Divide.
[tex]d=\frac{2}{3} \ g/cm^3[/tex]
[tex]d= 0.666666667 \ g/cm^3[/tex]
The density is 2/3 grams per cubic centimeter.
I need some help, anything will help, I just need a better understanding of this
Answer:
12 meters
Explanation:
to find this we look at the 8 on the horizontal line this is 8 seconds, you then look upwards to see the height at that point in time
Which sample of water has the most thermal energy?
O A. A 0.5 kg sample at 1°C
O B. A 1.5 kg sample at 10°C
O C. A 1 kg sample at 10°C
O D. A1 kg sample at 4°C
Answer:b
Explanation:
A person walks 2.00 m east, then turns and goes 4.00 m west, then turns and goes back 1.00m East
what is the persons displacement?
Answer: what is the person’s distance
HURRY PLEASEE
Whenever an object exerts a force on another object, the second object exerts a force of the same magnitude, but in the_______
of the first object
direction to that of the first object
A) opposite
B) same
C) right angle
D) vertical
Answer:
A)Opposite direction
Explanation:
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What happens to a circuit's R, V, and I when you change the length of the wire
in the circuit?
The resistance in a circuit is directly proportional to the length of the wire. Thus as the length increases, R increases and current I decrease. But the voltage v remains constant.
What is Ohm's law ?Ohm's law states that, the voltage across a circuit is the product of the current and resistance.
Thus, V = I R
The resistance R is expressed by the expression:
R = ρ l/a
where ρ is the proportionality constant called resistivity and l and a be the length and area of the wire.
Thus, as the length increases, resistance also increases.
The increase in resistance result in a decrease the current through the circuit. Therefore, voltage remains constant. Hence, option B is correct.
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How far will you travel if you run for 30 seconds at 6m/sec?
what is kinetice energy
Answer:
energy which a body possesses by virtue of being in motion.
Answer:
kinetic energy, simply, is movement energy. it is energy which an object posses for its motion. in order to accelerate the object force must be applied. examples include:
moving your hand a ball rolling runningWhich of the following correctly lists the energy conversions that happen when you plug a fan into an electrical outlet and turn it on?
A: chemical, nuclear, potential
B: sound,thermal, kinetic
C:sound,nuclear,electrical
D:chemical,sound,fission
Ruby wants to find out what variables affect the rate at which sugar dissolves in water. She records different information about four containers of water and sugar, as shown in the table below.
Which two containers should Ruby choose to investigate the effect that temperature has on the rate at which sugar dissolves?
Answer:
The correct answer is - containers 1 and 3.
Explanation:
In any experiment or investigation, there must be all the factors should be constant other than the variable that is changed to see the effect on the result or desired character.
In this experiment to check the effect of the temperature, there must be the only temperature is a variable that should be manipulated rest should remain constant. In container 1st and 3rd, all the variable amount of sugar, the method of mixing all are the same except temperature.
Thus, the correct answer is - 1 and 3rd.
2. A girl throws a marshmallow that lands in her friend's mouth 2 m away. The girl threw the marshmalow
at an angle of 30 degrees. How hard did she throw the marshmallow?
Answer:
The speed at which she threw the marshmallow is approximately 4.76 m/s
Explanation:
The given in formation are;
The range in which the marshmallow was thrown = 2 m (The location of her friend)
The angle at which the marshmallow was thrown = 30 degrees
The horizontal range is given by the following formula;
[tex]R = \dfrac{u^2 \times sin(2\cdot \theta)}{g}[/tex]
Where;
R = The range = 3 m
u = The initial velocity
θ = The angle at which the marshmallow was thrown = 30°
g = The acceleration due to gravity = 9.81 m/s²
By substitution, we have;
[tex]2 = \dfrac{u^2 \times sin(2\times 30)}{9.81} = \dfrac{u^2 \times sin(60)}{9.81}[/tex]
[tex]\therefore u^2 = \dfrac{ 2 \times 9.81}{sin(60)} = \dfrac{u^2 \times sin(60)}{9.81} \approx 22.66[/tex]
u ≈ √(22.66) ≈ 4.76 m/s
u ≈ 4.76 m/s
The speed at which she threw the marshmallow ≈ 4.76 m/s.
Answer:
4.76 m/s
Explanation:
3. You have a ton of homework to do over the weekend because you were sick during the week. You plan on spending lots of time on Saturday working on your English paper and Science project. On Thursday your best friend calls and invites you to go bowling and to dinner on Saturday. What should you do and Why?
Answer:
No you should not go
Explanation:
Because if you go you will be more behind and then you’ll get so stressed from the work that you didn’t do and then it will just keep on stacking up and get more and more stressed and also another reason is because you should do the responsible choice and stay home and work on your project so you would be telling your friend that you can not go Because you got work to do and maybe you could schedule it for the next weekend and have your fun next week and you should always do the responsible choice.
A ball with a mass of 0.5 kg is hit with a force of 2.5 N what is its acceleration?
Explanation:
50 m/s may squared siya sa dun sa may s
can someone please write this analysis of the force magnitudes calculated in problems 1 and 2 for me?
Answer:
Explanation:
i didnt got what you had said about qn 1 and 2
qn 10 :pic given
qn 11;F = m * a
The apple's acceleration is not influenced by the acceleration due to gravity for this question. In real life it most certainly is influenced by gravity.
F = m * a
F = 10 Newtons.
a = 6 m/s^2
m = 10/6 = 1.66 kg.
Plzzzzzzzz helppp me 10 pointsssssssssssssss!!
Question:
How is the shell of a hard-boiled egg similar to the Earth’s crust?
Question:
Besides an egg, provide your own example of some object you may know that could be seen as a model of the Earth’s crust.
PLZZ help and answer BOTH
what’s the relationship between height and potential energy?
Answer:
the higher up an object is, the more potential energy it has
Explanation:
What are the 4 states of matter
There are four natural states of matter: Solids, liquids, gases and plasma.
Answer:
There are 4 states of matter. Solid, liquid, gas, and plasma.
Explanation:
Plasma isn't that important, the main ones are solid, liquid, and gas.
what is the formula for calculating gravitational potential energy
Answer:
PEgrav = m *• g • h
Explanation:
In the above equation, m represents the mass of the object, h represents the height of the object and g represents the gravitational field strength (9.8 N/kg on Earth) - sometimes referred to as the acceleration of gravity.
Hope this helps
Question 8 of 16
A school bus takes 30 minutes to reach the school from your house. If the average velocity of the bus is 6 m/s to the east, what is the bus's displacement?
(6.3 points)
A. 180 m
B. 180 m east
C. 1.08 x 10^4 m
D. 1.08 x 10^4 m east
Answer:
b
Explanation:
im pretty sure its b
An airplane traveled 300 km northeast in 2.5 hours. Find the velocity of the plane.
Answer: 120 km per hour.
Explanation: 300/2.5 = 120.
1. Surface temperatures on the planet Mars range from –89 °C to –31 °C. Express this temperature range in Kelvin.
2. The average surface temperature on Jupiter is about 165K. Express this temperature in degrees Celsius.
3. The average surface temperature on Saturn is 134K. Express this temperature in degrees Celsius.
4. The average surface temperature on the dwarf planet Pluto is 50K. Express this temperature in degrees Celsius.
5. The Sun has several regions. The apparent surface that we can see from a distance is called the photosphere. Temperatures of the photosphere range from 5,000 °C to 8,000 °C. Express this temperature range in Kelvin.
An evacuated long tube contains a coin and a feather. If both objects fall together starting from the top of the tube, it is expected that: If this experiment is repeated at a place 2000 kilometers above the sea-level, the acceleration due to gravity gexp is expected to :
Answer:
gexp = 3.65 m/s²
Explanation:
The value of acceleration due to gravity changes with the altitude. The following formula gives the value of acceleration due to gravity at some altitude from the sea level:
gexp = g(1 - 2h/Re)
where,
gexp = expected value of g at altitude = ?
g = acceleration due to gravity at sea level = 9.8 m/s²
h = altitude = 2000 km = 2 x 10⁶ m
Re = Radius of Earth = 6.37 x 10⁶ m
Therefore,
gexp = (9.8 m/s²)(1 - 2*2 x 10⁶ m/6.37 x 10⁶ m)
gexp = 3.65 m/s²
