Answer:
3N
Explanation:
Note that when an object is immersed in water it weighs less.
This means the weight seen is the apparent weight.
Now in water there is upthrust and is a counter force acting on the object and this force is opposite to the weight of the fluid alongside the container 10N
The apparent weight is the real weight - the upthrust
7N-10 = -3N
The essence of the negative sign is to show that this force is acting in opposite direction to the weight.
Note: the upthrust is 10N and it's opposite to the weight of the fluid and the tube on which the object on the force meter is subjected to.
Spaceship 1 and spaceship 2 have equal masses of 150kg. Spaceship 1 has the speed of 0 m/s and spaceship 2 has a speed of 6 m/s. They collide and stick together and what is their speed ?
Answer:
3 m/s
Explanation:
The computation of speed is shown below:-
We will compute the equation by using the law of conservation of momentum; also, the total momentum prior and following the collision must be conserved. Therefore we can write the equation is the following manner:-
[tex]m_1 u_1 + m_2 u_2 = (m_1 +m_2)v[/tex]
where the symbols represent
150 kg is the mass of spaceship 1 = m1
150 kg is the mass of spaceship 2 = m2
0 m/s is the initial velocity of spaceship 1 = u1
6 m/s is the initial velocity of spaceship 2 = u2
and v is the velocity of the 2 ships so that they can collide and combined together
For v we will get the following equation to reach the speed
[tex]v=\frac{m_1 u_1 + m_2 u_2}{m_1+m_2}[/tex]
[tex]=\frac{0+(150)(6)}{150+150}[/tex]
[tex]=3 m/s[/tex]
The kinetic theory is useful for a explaining how matter and energy are not always related. b testing the temperature of a gas. c determining how much heat is necessary to melt a solid. d showing the differences between states of matter.
Answer:
showing the differences between states of matter.
Answer:
D
Explanation:
the kinetic theory of matter states that matter is made up of molecules that are in continuous motion.this in turn talks about the different states of matter
at what point does the external energy enter the system?
If you push on a wall of a building what will happen
Answer: It will push back with an equal amount of force.
A home uses about 4*10^11 power joules of energy each year. In many parts of the United States there are about 3000 h of sunlight each year. How much energy from the sun falls on one square meter each year? If the solar energy can be converted to useful energy with an efficiency of 20%, how large an area of converters would produce the energy needed by the home?
Answer:
The Sun transfers in each second and amount of 1367J per square meter, so in hour it can transfer:
E = 60*60*1367 J/h*m2 = 4,921,200 J/h*m^2.
in one year, we have 3000h*4,921,200 J/h*m^2. = 14,763,600,000 Joules per square meter.
Now, only 20% of this can be used as energy, so the amount that can be used is:
E = 0.2* 14,763,600,000 J/m^2 = 2,952,720,000 J/m^2
Now, we want to find the number X of square meters such:
X*2,952,720,000 J/m^2 = 4x10^11 J
X = ( 4x10^11 J)/(2,952,720,000 J/m^2) = 135.5 m^2
So you only need around 135.5 square metters per house.
the weight of a body of certain mass becomes zero in space.why?write with reasons
Answer:
Weight is what you get when a certain amount of gravity is acting on that mass, and something, like the surface of a planet, is resisting that action. In space, when falling freely, there's nothing resisting the pull of gravity so weight disappears. Mass however stays.
hope this helps u
Explanation:
A rocket weighing 560,000 N is taking off from Earth with a total thrust of
700,000 N at an angle of 20 degrees, as shown in the image below. What is
the approximate vertical component of the net force that is moving the rocket
away from Earth?
A. 76,000 N
B. 112,000 N
C. 132,000 N
D. 98,000 N
Answer:
D
Explanation:
LA FUERZA NETA ES LA FUERZA TOTAL DE EMPUJE MENOS EL PESO DEL
COHETE.
[tex]F_{y}[/tex] = 700000 N(sen 90° - 20°) - 560000 N = 97785 N
The approximate vertical component of the net force that is propelling the rocket away from Earth is 112,000 N. Option B is correct.
The net force acting on the rocket is the sum of the thrust force and the weight of the rocket. The thrust force is pointing upwards at an angle of 20 degrees, and the weight of the rocket is pointing downwards. The thrust force is the force that is generated by the rocket engine. It is the force that propels the rocket upwards.
The weight of the rocket is the force of gravity acting on the rocket. It is the force that pulls the rocket downwards. The net force acting on the rocket is the sum of the thrust force and the weight of the rocket. If the net force is positive, the rocket will accelerate upwards. If the net force is negative, the rocket will accelerate downwards. If the net force is zero, the rocket will remain at rest.
net force = thrust force + weight
vertical component of net force = thrust force * cos(angle)
vertical component of net force = 700,000 N * cos(20 degrees) = 112,000 N. Option B is correct.
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What is work done in physics?
Answer:
work done is the product of force and distance moved in the direction of a force
Answer:
work is said to be done when an energy or force is used.
Explanation:
when you carry a cement and you take a step, work is done.
the process of converting a solid into liquid at its melting point is called fusion(true or false)
False, the process of converting a solid into liquid at its melting point is called melting.
What is fusion ?
When two light atoms combine to form a new heavier nucleus this process is known as fusion. For example, when two hydrogen atoms combine to form helium atom.
Upon reaching a substance's melting point, the heat supplied by the substance (latent heat of fusion) causes the molecules to drift apart and the substance changes state (solid to liquid) by increasing its internal energy, resulting in a temperature decrease and a change of state (solid to liquid).
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what is the charge of a newly formed oxygen ion
The charge of a newly formed oxygen ion would be -2
Hope this helps :)
3 differences between heat and temperature
Answer:
Difference Between Heat and Temperature
heat vs temperature The concept of heat and temperature are studied together in science, which is somewhat related but not alike. The terms are very common, due to their wide usage in our day to day life. There exist a fine line which demarcates heat from temperature, in the sense that heat is thought of, as a form of energy, but the temperature is a measure of energy.
The differences between heat and temperature can be summarised in points as follows:
Heat1.Heat is the form of energy that flows from the system to its surrounding.
2. Mass of the body affects the total heat.
3. Heat is measured in joules or calories.
4.2Joules =1 calorie
4. Heat is measured by using a calorimeter.
TemperatureTemperature is the result of heat.Mass of the body does not effect on temperature but depends on the molecular vibration of the body.Temperature is measured in degree, Celsius or degree Fahrenheit or Kelvin scale.Temperature is measured by using thermometer.Hope it helps...
Good luck on your assignment...
Sasha sits on a horse on a carousel 3.5 m from the center of the circle. She makes a revolution once every 8.2 seconds. What is Sasha’s tangential speed?
-0.9 m/s
-1.3 m/s
-2.7 m/s
Answer: 2.7 m/s
Explanation:
Given the following :
Period (T) = 8.2 seconds
Radius = 3.5 m
The tangential speed is given as:
V = Radius × ω
ω = angular speed = (2 × pi) / T
ω = (2 × 22/7) / 8.2
ω = 6.2857142 / 8.2
ω = 0.7665505
Therefore, tangential speed (V) equals;
r × ω
3.5 × 0.7665505 = 2.6829268 m/s
2.7 m/s
Answer:
2.7
Explanation:
edge
A positive charge of 1 µC is taken from points A & B such that VA-VB = 100 V. Then the
energy of charge increases by 10-3 J
energy of charge decreases by 10-3 J
energy of charge remains unchanged
energy of charge decreases by 103
Explanation:
It is given that,
Let Charge of [tex]1\ \mu C[/tex] is taken from points A & B such that [tex]V_A-V_B=1000\ V[/tex].
We need to find the energy of charge. Electric potential is defined as the work done per unit of electric charge. So,
[tex]W=(V_B-V_A)q\\\\W=-1000\times 10^{-6}\\\\W=E=-10^{-3}\ J[/tex]
So, the energy of charge decreases by [tex]10^{-3}\ J[/tex]. Hence, the correct option is (a).
difinition of static coefficient friction
Explanation:
Static friction is a type of friction in which two objects don't move relative to each other. The force due to static friction is given by :
[tex]F=\mu_s N[/tex]
N is normal force
[tex]\mu[/tex] is coefficient of static friction
For the kinetic friction, the force becomes :
[tex]F=\mu_kN[/tex]
he Volume in an experiment is changed (in mL) is 200, 100, 50, 25, 12.5 and we measured the pressure (in atm) is 0.1000, 0.2000, 0.4000, 0.8000, 1.6000 then the slope of the graph will be... (Hint: You may want to draw it out first. Keep the numbers in order when you create your data table.)
Answer: Slope = - 1000.
Explanation:
The line of best fit of the graph will be linear.
The general linear equation can be expressed as;
Y = MX + C
Where the Y variable represents the volume in the experiment as dependent variable and the X represent the pressure as independent variable.
The equation can be rewritten as:
V = MP + C
Where C is the intercept.
Given that
V = 200, 100, 50, 25, 12.5 and
Pressure P = 0.1000, 0.2000, 0.4000, 0.8000, 1.6000
The slope M can be calculated by using the formula
M = (V2 - V1)/ (P2 - P1)
Where V1 = 200, V2 = 100, P1 = 0.1, P2 = 0.2
Substitute all the parameters into the formula
M =( 100 - 200)/ ( 0.2 - 0.1 )
M = -100/0.1
Slope M = - 1000
Which food provides the body with energy in the form of carbohydrates
Grains, pasta, etc provides the body with energy in the form of carbohydrates because they're absorbed quickly by the body and used for energy.
An electric pole casts a shadow of 24 m long . If the tip of the shadow is 25m far from the top of the pole , how high is the pole?????
Answer:
7 m
Explanation:
a^ + b^=c^
a^ + 24^=25^
a^+576=625
a^=625-576
a^=49
a=7
1) A U-tube, in which both ends are open to the atmosphere, is partially filled with water. Oil which does not mix with water is poured into one side of the tube until it stands a distance d=12.3 mm above the water level on the other
side which has meanwhile risen a distancea=67.5 mm from its original level Find the density of the oil
2) The mercury column in a barometer has a measured height h of 740.35 mm. the temperature is-5.0 C
which temperature the density of mercury is 1.3608 104 kg/m3. the free-fall acceleration at the site of the
barometer is 9.7835 m/s2. What is the atmospheric pressure?
Answer:
1) 916 kg/m³
2) 9.8566×10⁴ Pa
Explanation:
1) Originally, the water is at the same level on both sides. When the oil is added, one side goes down 67.5 mm and the other side goes up 67.5 mm. The top of the oil is 12.3 mm above the water, so the total height of the oil relative to the low end of the water is:
12.3 mm + 67.5 mm + 67.5 mm = 147.3 mm
And the height of the water relative to the low end is:
67.5 mm + 67.5 mm = 135 mm
The pressure at the bottom of the oil equals the pressure of the water at the same elevation.
P = P
ρgh = ρgh
ρh = ρh
ρ (147.3 mm) = (1000 kg/m³) (135 mm)
ρ = 916 kg/m³
2) P = ρgh
P = (1.3608×10⁴ kg/m³) (9.7835 m/s²) (0.74035 m)
P = 9.8566×10⁴ Pa
Why do your legs appear shorter when standing in water
what is the method of charging used when you run a straw with fur
Answer:
charging by friction
Explanation:
Friction is another method of making a charge become higher than the other.
With either straw or a fur,charging by friction is used.
a footballer took a penalty kick and ball moved with a velocity of 4mls, calculate the work done by the footballer if the mass of the ball was 40g
Answer:
Work done = 80 gm/s
Explanation:
Given:
Final velocity (v) = 4 m/s
Initial velocity (u) = 0 m/s
Mass of ball (m) = 40 g
Find:
Work done.
Computation:
Using work energy rule
Work done = Change in kinetic energy
Work done = 1/2[mv-mu]
Work done = 1/2[(40)(4) - (40)(0)]
Work done = 1/2[(40)(4)]
Work done = 80 gm/s
If an atom loses two electrons what charge will it have?
+1
-1
+2
-2
Answer:
+2
Explanation:
Because electrons are negative so if electrons are lost then it will automatically become positive in this case +2. This will be right if there are then more electrons than protons in total. I pretty sure it's correct.
8. An object starts from rest and accelerates at
1.30 m/s2 [N] for 6.00 s. What is the final
velocity of the object?
need help
Answer:
here is the answer
Explanation:
initial velocity= u= 0
final velocity = v
acceleration= 1.30m/s²
time= 6 seconds
using formula
a = v-u/t
1.30 = v - 0/6
1.30*6 = v - 0
7.8= v - 0
7.8 = v
therefore, final velocity is 7.8 m/s
A small object is placed on the principal axis of a convex mirror of focal length 10cm . Determine the position of the image when the object is 15cm from the mirror.
Answer:
v = 6 cm
Explanation:
We have,
A small object is placed on the principal axis of a convex mirror of focal length 10 cm. The focal length of a convex mirror is positive. So, f = +10 cm
It is required to find the position of the image when the object is 15 cm from the mirror. Using mirror's formula :
[tex]\dfrac{1}{v}+\dfrac{1}{u}=\dfrac{1}{f}[/tex]
v is image distance
[tex]\dfrac{1}{v}=\dfrac{1}{f}-\dfrac{1}{u}\\\\\dfrac{1}{v}=\dfrac{1}{+10}-\dfrac{1}{(-15)}\\\\v=6\ cm[/tex]
Hence, the image will formed at a distance of 6 cm form the mirror.
Collision 1: Blue Cart Initially at Rest Set the initial blue cart velocity to 0 m/s. Set the mass values to different values. Run the simulation and record the mass and velocity values. Before Collision After Collision mRed = _________ kg mBlue = _________ kg Use mass and velocity values to complete the following momentum table. Before Collision After Collision ∆Momentum Red Cart ________kg x _______m/s = ____________kg•m/s ________kg x _______m/s = ____________kg•m/s Blue Cart ________kg x _______m/s = ____________kg•m/s ________kg x _______m/s = ____________kg•m/s
Answer:
it is very hard but i am trying to help you.
Explanation:
Marie lifts a 5 kg mass from the floor and puts in on a table one metre high. What is the work done?
Answer:
The work done was 49.05 N*m.
Explanation:
The work done by a a force is given by:
[tex]W = F*d[/tex]
We first need to calculate the force necessary to lift the box from the ground, the force needed for is the weigh of the box, which is shown below:
[tex]F = m*g\\F = 5*9.81\\F = 49.05 \text{ N}[/tex]
Therefore the work done by lifting the box and placing it on the table is:
[tex]W = 49.05*1 \\W = 49.05 \text{ N*m}[/tex]
The work done was 49.05 N*m.
A ramp with a mechanical advantage of 4 is used to move a 38-newton load. What
effort force is needed to push the load up the ramp?
A.9.5 N
B.15.2N
C.3.9 N
D.0.11 N
Explanation:
It is given that,
Mechanical advantage of a ramp is 4
It is used to move a 38 N load
We need to find the force needed to push the load up the ramp. The mechanical advantage is equal to the ratio of output force to the input force. We have output force as 38 N
So,
[tex]4=\dfrac{38}{F_i}\\\\F_i=\frac{38}{4}\\\\F_i=9.5\ N[/tex]
So, the force of 9.5 N is needed to push the load up the ramp.
If the mass of the tritium nucleus is 3.02 universal mass units and the mass of the helium nucleus is 4.00 universal mass units, how much energy (in Megaelectronvolts) is absorbed as the tritium decays into helium?
Answer: the answer is a
Explanation just did the test
The de Broglie relation λ=h/p can be rewritten in terms of the wave number k as p=kℏ. Recall that wave number is defined by k=2π/λ. Using the fact that λ=v/f, find the wave numbers k1 and k2 corresponding to frequencies f1 and f2. Express your answer as two expressions
Answer:
k₁ = 2πf₁/v
k₂ = 2πf₂/v
Explanation:
Since the de Broglie relation λ=h/p (1 ) and momentum, p =kℏ (2)
From (1) p = h/λ = kℏ
So, h/λ = kℏ
Hence, k = h/ℏλ since ℏ = h/2π and wavelength, λ = v/f, substituting these two into k, we have
k = h/[(h/2π)(v/f)]
k = 2πf/v where k = wave number, f = frequency of wave and v = velocity of wave.
Now, for the first wave number k₁, k₁ = 2πf₁/v
for the second wave number k₂, k₂ = 2πf₂/v
how is matter identified
Answer:
It can be identified using physical properties such as density
Explanation:
Matter is any substance that has mass and takes up space. Therefore, it can be identified using physical properties such as density
Explanation:
We can identify matter by:
1.physical properties.
2.chemical properties.
Hope this helps...