An object that is 10 m above the ground, posesses 2.000 J of gravitational potential energy. What is the object's mass?
Answer:
20kilograms
Explanation:
GPE = MGH
2000 = M × 10m/s2 × 10
100m= 2000
m = 20kg ( Answer)
A cart was allowed to roll down a ramp from rest. It reached the bottom of the ramp
with a speed of 25 cm/s. A student could conclude that the cart -
a.gained mass
b.accelerated down the ramp
c.lost energy
d.moved at a constant speed
Answer:
accelerated down the ramp
Explanation:
It can be concluded that the cart accelerated down the ramp is the correct choice.
Acceleration is the rate of change of velocity with time.
We see that as time increases, the velocity of the car also increase.
Initially, the car is at rest with a velocity of 0cm/s. With the passage of time, as it slides down the ramp, the velocity increases to 25cm/s.
Since acceleration is the rate of change of velocity with time, it is glaring that the acceleration of the body greatly increased as it moves down the ramp
4.
Which wave diffracts the most when encountering an obstacle?
O a surface wave
O a wave with the longest wavelength
O a longitudinal wave
O a wave with the highest amplitude
Answer:
Answer is a wave with the longest wavelength.
Explanation:
I hope it's helpful!
A large pendulum swings in the lobby of the United Nations building in New York City. The pendulum has a 91-kg gold-plated bob and a length of 22.9 m. Assume g = 9.81 m/s2.
Part A
How much time does it take for the bob to swing from its maximum displacement to its equilibrium position?
Express your answer to three significant figures and include the appropriate units.
Answer:
t = 2.40 s
Explanation:
It just told me
Heat energy is produced when molecules move. True False
Answer:
true
Explanation:
If you were to look at grains of table salt with a magnifying glass, you would see that each grain is a little cube. Why are salt grains cubical?
Answer:
All extended structure compounds form cubes. Sodium and chlorine atoms both have cubical shapes. In the extended structure of NaCI, atoms are arranged in a cubical pattern
What is the mass of basswood wing with these dimensions: 26.9 cm x 5.5 cm x 0.15 cm?
The mass of the basswood wing with the given dimension is 710.14 g. Basswood is a low-density, light wood.
What is basswood?Basswood is a low-density, light wood that is mainly used for artistic work such as hand carving and creating musical instruments.
The mass can be calculated by the formula,
[tex]m = v \times d[/tex]
Where,
[tex]m[/tex]- mass
[tex]v[/tex] - volume = 26.9 cm x 5.5 cm x 0.15 cm = 22.192 ml
[tex]d[/tex] - density = 32 g/cm3
Put the values in the formula,
[tex]m[/tex] = 22.192 x 32
[tex]m[/tex] = 710.14 g
Therefore, the mass of the basswood wing with the given dimension is 710.14 g.
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Sergio wants to begin a sensible weight loss program. Along with healthy nutrition which fitness product would benefit him the most in this weight loss goal?
Answer:
b. Comfortable pair of athletic shoes.
Explanation:
Analyzing the information and the options, the fitness product that would most assist Sergio in reaching his weight loss goals would be the pair of comfortable sports shoes, which he could use to do running exercises.
For beginning practitioners it is ideal to start exercising with short 30-minute walks until the body adapts and you gain physical conditioning and endurance.
Running has the advantage of being an excellent exercise that can be practiced anywhere, and helps in the production of dopamine, which produces a feeling of well-being and also helps in reducing hunger, in addition to working and strengthening various muscle groups in the body, activate blood circulation, decrease anxiety, improve cholesterol levels, control blood pressure, etc.
Answer:
b. Comfortable pair of athletic shoes.
Explanation:
What is the correct definition of a hypothesis
Answer:
Hypothesis is simply a theory given on something which may be correct or not.
teacher drops a book to wake up his class, and the book hits the ground after 0.5 seconds. How high was the book?
As shown in the figure above, a 50 kg box is dragged across the floor with a pulling force (Fp) of 200 N which acts at an angle of 30 degrees above the horizontal. The coefficient of kinetic friction is 0.25. What is the acceleration of the box? (Use g = 9.8 m/s2. Hint: the normal force is not equal to the weight)
Answer:
The acceleration of the box is 2.05 m/s²
Explanation:
The given parameters of the motion of the box are;
The mass of the box, m = 50 kg
The pulling force, [tex]F_p[/tex] acting on the box = 200 N
The angle at which the force acts, θ = 30° above the horizontal
The coefficient of kinetic friction, [tex]\mu_k[/tex] = 0.25
The normal reaction from the box resting on a flat surface, N = The weight of the box, W - The vertical component of the pulling force, [tex]F_{py}[/tex]
N = W - [tex]F_{py}[/tex] = m·g - [tex]F_p[/tex] × sin(θ)
Where;
g = The acceleration due to gravity = 9.8 m/s²
∴ N = W - [tex]F_{py}[/tex] = m·g - [tex]F_p[/tex] × sin(θ) = 50 kg × 9.8 m/s² - 200 N × sin(30°)
∴ N = 490 N - 200 N × 0.5 = 390 N
The normal reaction, N = 390 N
The force of friction, [tex]F_f[/tex] = The coefficient of kinetic friction, [tex]\mu_k[/tex] × The normal reaction, N
∴ [tex]F_f[/tex] = [tex]\mu_k[/tex] × N = 0.25 × 390 N = 97.5 N
The net force, [tex]F_{NET}[/tex], acting on the block = The pulling force, [tex]F_p[/tex] - The friction force, [tex]F_f[/tex]
∴ [tex]F_{NET}[/tex] = [tex]F_p[/tex] - [tex]F_f[/tex] = 200 N - 97.5 N = 102.5 N
[tex]F_{NET}[/tex] = 102.5 N
According to Newton's second law of motion on the net force acting on an object, we have;
[tex]F_{NET}[/tex] = m × a
Where;
a = The acceleration of the box
∴ a = [tex]F_{NET}[/tex]/m = 102.5 N/(50 kg) = 2.05 m/s²
The acceleration of the box = a = 2.05 m/s².
In this reaction diagram which part represents the doffrence in energy between the reactants and the products?
Answer:
The correct answer is - option C. G.
Explanation:
In this reaction diagram, there is a representation of the reaction profile. The reaction profile shows the change that takes place during a reaction in the energy of reactants or substrate and products. In this profile, activation energy looks like a hump in the line, and the minimum energy required to initiate the reaction.
The overall energy of the reaction, including or excluding activation energy depends on the nature of the reaction if it is exothermic or endothermic. and products are represented by the G which shows the difference between the energy of the reactants and products.
Answer:
C.) G
Explanation:
:p
Name the Organs and functions of digestive system
A diagram is provided.What is the volume of the block of metal?
Answer:
You need to add a picture:)
On a sunny day, a student poured a cup of water on the sidewalk to make a puddle. When he returned later, the puddle was gone. The student concluded that the puddle was gone because the water soaked into the sidewalk. 1. What would you say to this student about this conclusion? 2. What could you do to demonstrate your idea about where the water went? Text EntryMedia Copy and paste or type your submission right here.
Answer:
The students conclusion is wrong.
Explanation:
The students conclusion is wrong because liquids can not soak into concrete. The water evaporated because it was a hot sunny day. The water turned into a gas called water vapor.
A 35 N force makes a 10 degree angle with the positive x-axis. What is the magnitude of the vertical component of the force?
Answer:
6.07 N
Explanation:
Given that,
Force, F = 35 N
It makes 10 degree angle with the positive x-axis.
We need to find the magnitude of the vertical component of the force. It can be given by :
[tex]F_y=F\sin\theta\\\\=35\times \sin(10)\\\\=6.07\ N[/tex]
So, the magnitude of the vertical component of the force is 6.07 N.
Answer:
Vertical component of force is equal to [tex]6.067[/tex] N
Explanation:
The magnitude of the vertical component on any force when α is the angle between the direction of force and the X -axis is
[tex]F_y = F * Sin\alpha[/tex]
Substituting the given values in above equation, we get -
[tex]F_y = 35 * Sin 10\\F_Y = 35 * 0.1736\\F_Y = 6.067[/tex]
Vertical component of force is equal to [tex]6.067[/tex] N
What is the net force on the block shown above?
50 N Up
50 N Down
0 N
5 N Down
Answer:
50 N UP
Explanation:
[tex]F_{g} = 150[/tex]
to
[tex]F_{n} = 200[/tex]
Is adding 50 which means you are going up.
Hope this helped!
Have a supercalifragilisticexpialidocious day!
A laser beam from Earth is reflected by a mirror placed on the Moon. If the speed of the beam is 3.00 x 108 m / s and the distance from Earth to the Moon is 3.81 x 108 m, how long in seconds will the laser beam take to return to its starting point?
Answer:
1.27seconds
Explanation:
Speed = 324 m/s , Distance = 411.48m
Time = Distance/Speed
Time = 411.48/324 seconds
Time = 1.27seconds ( Ans)
Please answer the question for gravitational field attached in the image.
We are given:
Radius of Venus= 6 * 10⁶ m
Height above the planet's ground = 9.4 * 10⁶ m
Mass of Venus = 4.867 * 10²⁴ kg
Finding the Gravitational Field:
We first need to calculate the distance between the center of masses
Distance between center of masses:
Since the point is above the surface of Venus, the radius of Venus and the height will add
Distance between the center of masses = 9.4*10⁶ + 6 * 10⁶
Distance (r) = 15.4 * 10⁶ m
Now back to Gravitational field!
We know the formula for Gravitational Field:
g = GM / r² [where g is the gravitational field, M is the mass of the planet, r is the distance between the center of masses and G is the gravitational constant]
plugging the known values in the formula:
g = (6.67 * 10⁻¹¹ * 4.867 * 10²⁴) / (15.4*10⁶)² [G = 6.67*10⁻¹¹ Nm²/kg²]
g = (32.46 * 10¹³) / (237 * 10¹²)
g = (32.46 * 10¹³) / (23.7 * 10¹³)
g = 32.46/23.7 [the 10¹³ got cancelled out]
g = 1.367 N/kg² (or m/s²)
HELPP!!!
1)Explain how a diode could be used to convert a.c. to d.c., and suggest one disadvantage of this.
2) Some energy is always transferred to the surroundings when a current flows through a wire.
a) How is this energy transferred?
b) Is this energy always wasted energy? Explain your answer.
3) You can induce an electric current in a wire by moving a magnet relative to the coil.
A) Describe two different ways in which you can increase the size of the induced current.
B) Describe how you can reverse the direction of the induced current.
Try to split the questions for easy access
A roller coaster has a velocity of 25 m/s at the bottom of the first hill. How high was the hill?
PLEASE HELP
Answer:
The height of the hill is "31.85 m".
Explanation:
The given value is:
Velocity,
v = 25 m/s
As we know,
⇒ [tex]Kinetic \ energy =Potential \ energy[/tex]
i.e,
⇒ [tex]mgh=\frac{1}{2} mv^2[/tex]
⇒ [tex]gh=\frac{1}{2} v^2[/tex]
⇒ [tex]h=\frac{v^2}{2g}[/tex]
On substituting the given value, we get
⇒ [tex]h=\frac{(25)^2}{2\times 9.81}[/tex]
⇒ [tex]=\frac{625}{19.62}[/tex]
⇒ [tex]=31.85 \ m[/tex]
Given;
Velocity, v = 25 m/sWe know the relation,
→ [tex]Kinetic \ energy (K.E) = Potential \ energy (P.E)[/tex]
or,
→ [tex]mgh = \frac{1}{2}mv^2[/tex]
or,
→ [tex]gh = \frac{1}{2}v^2[/tex]
[tex]h = \frac{v^2}{2g}[/tex]
By putting the values, we get
[tex]= \frac{(25)^2}{2\times 9.81}[/tex]
[tex]= \frac{625}{19.62}[/tex]
[tex]= 31.85 \ m[/tex]
Thus the response above is right.
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A satellite is orbiting the Earth. If the satellite was placed in an orbit at twice the original distance,
what would happen to the force of gravity? By how much would the gravitational force increase or
decrease?
Help! will give brainliest!
Answer:
I would say increasing the balls kinetic energy
Explanation:
Because she is moving the ball and increasing kinetic energy
A student throws a 0.22 kg rock horizontally at 20.0 m/s from 10.0 m above the ground. Find the initial kinetic energy of the rock.
Answer:
44J
Explanation:
Given parameters:
Mass of rock = 0.22kg
Initial velocity = 20m/s
Distance moved = 10m
Unknown:
Initial kinetic energy of the rock = ?
Solution:
To solve this problem, we need to understand that kinetic energy is the energy due to the motion of a body.
It is mathematically expressed as;
Kinetic energy = [tex]\frac{1}{2}[/tex] m v²
m is the mass
v is the velocity
Kinetic energy = [tex]\frac{1}{2}[/tex] x 0.22 x 20² = 44J
In your own words, explain what a field is in science. Use specific examples to support your explanation.
Answer:
Field, In physics, a region in which each point is affected by a force.
Explanation:
A train left the station at 9:00am. The next stop was 629 km south. It
arrived at 2:00pm the same day. What was its speed?
Explanation:
We need to calculate the time it had travelled first:
9:00 to 12:00 = 3 hours.
12:00 to 2:00 = 2 hours
Total travel time = 5 hours.
The formula for speed is distance ÷ time (Hence, the unit for speed is m/s, kph, mph, etc.)
= 629km ÷ 5 hours
= 125.8 km/hour ~ 125.8kph
A slingshot is fired with an initial velocity of 100 m/s at an angle of 55° follows a parabolic trajectory and hits a stationary balloon at the top of its path. With what horizontal speed does the slingshot pebble hit the balloon?
Answer:
The horizontal speed with which the slingshot hits the balloon is approximately 57.358 m/s
Explanation:
The given parameters of the slingshot motion are;
The initial velocity of the slingshot, v = 100 m/s
The angle (to the horizontal) at which the slingshot is fired makes, θ = 55°
The path of the slingshot which hits the stationary balloon at the top of its flight = Parabolic trajectory
The horizontal component of the velocity = vₓ = v·cos(θ) = Constant
vₓ = 100 × cos(55°) ≈ 57.358
The horizontal speed with which the slingshot hits the balloon = vₓ ≈ 57.358 m/s.
A spring with a spring constant of 400 n / M has a mass hung on it so it stretches 8 cm. calculate how much mass the spring is supporting.
Answer:
3.3kg
Explanation:
Given parameters:
Spring constant = 400N/m
Extension = 8cm = 0.08m
Unknown:
Amount of mass the spring is supporting = ?
Solution:
To solve this problem:
F = kE
F is the force
k is the spring constant
E is the extension
So;
F = 400 x 0.08 = 32N
Mass;
Force = mass x acceleration due to gravity
32 = mass x 9.8
Mass = 3.3kg
The mass the spring is supporting is 3.27 Kg.
We'll begin by calculating the force acting on the spring.
Spring constant (K) = 400 N/mExtension (e) = 8cm = 8 / 100 = 0.08 mForce (F) =?F = Ke
F = 400 × 0.08
F = 32 N
Finally, we shall determine the mass. This can be obtained as follow:
Force (F) = 32 NAcceleration due to gravity (g) = 9.8 m/s²Mass (m) =?m = F / g
m = 32 / 9.8
m = 3.27 Kg
Therefore, the mass the spring is supporting is 3.27 Kg
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If the speed of an object does NOT change, the object is traveling at __________ speed.
If the speed of an object does NOT change, the object is traveling at uniform speed.
Answer:
answer is uniform
Explanation:
How can you confirm/show that decay is exponential? (when talking about damped oscillations) What is responsible for the damping force? Why?
Answer:
Following are the solution to this question:
Explanation:
In this question, it is usually designing the question with difference calculus but instead demonstrate there is an empirical term for both the answer of a nonlinear equation is the decay, Throughout the preliminary training programs, the origin of a damping word is usually resistance or Rossiter.