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:
hope this helps, have an amazing day
A 25 N force is applied to a 1.4 kg mass on level ground. If a 5 N frictional force is present between the surface and the object, what is the magnitude of the acceleration of this object?
Given parameters:
Force applied to the mass = 25N
Mass of the body = 1.4kg
Frictional force = 5N
Unknown:
Acceleration of the object = ?
Solution:
The net force on the object;
Fapplied - Frictional force = net force (m x a)
m is the mass of the body
a is the acceleration
Input the parameters and solve;
25 - 5 = 1.4 x a
1.4a = 20
a = [tex]\frac{20}{1.4}[/tex] = 14.3m/s²
The magnitude of the acceleration of the object is 14.3m/s²
Wooden handles on knives do not require maintenance.
TRUE
FALSE
Answer: false
Explanation:
You have to make sure it doesn’t stay wet
what will happen to products when we increase the amount of
reactants.
Answer:
Therefore, an increase in the concentration of a reactant will lead to a decrease in the amounts of all reactants and an increase in the amounts of all products.
Explanation:
Odysseus has returned from his epic voyage across the seas and gets off his boat at the end of a 50 meter pier. His beloved Penelope is waiting at the far side of the pier, at the origin. At the same time they see each other and race towards each other, meeting in a fierce embrace. Odysseus, exhausted from his journey, is able to run at 4 m/s, while Penelope can run at 6 m/s. Write an equation of motion for Odysseus.
Answer:
We know that:
Distance between Odysseus and Penelope = 50m
Speed of Odysseus = So = 4m/s
Speed of Penelope = Sp = 6m/s.
Now we want to find the equation of motion for Odysseus.
First, let's find the amount of time that he is moving, we know that when he meets with Penelope, he will stop moving.
Now they weel meet each other when the total distance traveled by both of them is equal to 50m.
Then, recalling that:
Distance = Time*speed.
50m = 4m/s*t + 6m/s*t = 10m/s*t
t = 50m/10m/s = 5s
They will move for 5 seconds.
Now we can write the movement equation for Odysseus as:
p(t) = 4m/s*t + p0 for (0s ≤ t ≤ 5s)
Where p0 is the initial position of Odysseus, and because we can put our coordinate axis where we want, we can define p0 = 0m.
Then the position of Odysseus is:
P(t) = 4m/s*t if 0s ≤ t ≤ 5s
P(t) = 4m/s*5s = 20m if t > 5s.
The second piece says that for t larger than 5 seconds, he will not move (at least for a given amount of time)
How long will it take a ball to roll 20 meters along the floor at a speed of 0.4 m/s
What does this experimental investigation lack?
Answer:
Experimental investigations involve a process in which a "fair test" is designed and variables are actively manipulated, controlled, and measured in an effort to gather evidence to support or refute a causal relationship. Experimental investigations have a control group which does not receive any treatment.
Answer: the answer is controll group
Explanation: hopes this help :)
A rocket has a mass of 15 kg and travels a distance of 250 meters in 13 seconds before it explodes.
What is the velocity of the rocket?
And
What is the momentum of the rocket?
Answer:
1. Velocity = 19.2m/s
2. Momentum = 288 Kg/ms-¹
Explanation:
1. The velocity of the rocket can be calculated by using the formula:
V = d/t
Where v = velocity/speed (m/s)
d = distance (m)
t = time (s)
Based on the provided information, d = 250m, t = 13s
v = 250/13
v = 19.231
v = 19.2m/s
2. The momentum of the rocket can be calculated thus:
p = m × v
Where;
p = momentum (Kg/ms-¹)
m = mass (kg)
v = velocity (m/s)
Based on the information, we have v= 19.23m/s, m = 15kg
p = 15 × 19.2
p = 288 Kg/ms-¹
PLEASE HELP!
Electric potential depends on which factors?
A: Mass and amount of charge
B: Distance and amount of charge
C: Mass and distance
D: Density and amount of charge
Answer:
B: Distance and amount of charge
Explanation:
I am taking the quiz and this is the correct answer!
Electric potential depends on Distance and amount of charge.
What is electric potential?The electric potential is defined as the amount of work needed to move a unit of electric charge from a reference point to the specific point in an electric field.
Electric potential depends on what factors?For any charge located in an electric field its electric potential depends on the type (positive or negative), amount of charge, and its position in the electric field.
To know more about Electric potential here
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an object is moving to the right and speeding up. Its acceleration is
A. positive
B. Negative
C. zero
Answer:
Positive
Explanation:
Answer:
positive
Explanation:
i'm reallt sorry if I'm wrong
Fun fact
An apple, potato, and onion all taste the same if you eat them with your nose plugged
Answer:
Fun fact
An apple, potato, and onion all taste the same if you eat them with your nose plugged
Explanation: yes
Potential energy calculation - MxGxH. Gravity equals 10. How much
potential energy does a 5 gram golf ball that is falling from 40 ft have? Use
your calculator if need be. *
Answer:
Ep = 0.6095 [J]
Explanation:
As defined in the problem statement, potential energy is defined as the product of mass by gravity by height. But first we must convert all the values given to measures of the international system (SI)
g = gravity = 10 [m/s^2]
h = elevation = 40 [ft] = 12.19 [m]
m = mass = 5 [g] = 0.005 [kg]
Ep = potential energy [J]
Ep = 0.005*10*12.19 = 0.6095 [J]
does light maicroscope require electric relay?
It needs something to light the light.
You go on American Eagle at Six Flags. The highest drop is 44.8 meters tall. It takes you 1.49 seconds to make that drop. How fast did you go?
Given parameters:
Height = 44.8m
Time to drop = 1.49s
Unknown:
Speed of drop = ?
Solution:
The is a speed problem.
Speed is one of the physical quantities. It is designated a scalar because it has magnitude but no directional orientation.
Speed is the distance divided by time.
In this problem distance is the same as the height of the drop.
Mathematically;
Speed = [tex]\frac{distance}{time}[/tex]
So, input the parameters and solve;
Speed = [tex]\frac{44.8}{1.49}[/tex] = 30.1m/s
The drop recorded a speed of 30.1m/s
Alfredo is trying to measure the speed that cars travel down the street outside of his house. Outside his house there is a stoplight, and then another stoplight about ½ mile down the road. Alfredo says, "I can use my watch with a second hand to time the cars from when they leave the first light and stop at the next light. To find the speed I can just take the ½ mile distance and divide by the time." What are two flaws with Alfredo's plan which will not allow him to see how many cars are speeding on his street? Also explain how you would revise the experiment to avoid these problems
Answer:
drastic assumption that the car moves along the path at the same speed,
hese failures, it would be necessary to take the time of each type of trajectory, accelerated, constant and decelerated, this method is not easy since it implies knowing the distance in each type of movement,
Explanation:
In this exercise Alfredo makes a drastic assumption that the car moves along the path at the same speed, in reality the car when leaving the first traffic light accelerates until it reaches a speed, then remains constant and decelerates to be able to stop at the second traffic light.
To overcome these failures, it would be necessary to take the time of each type of trajectory, accelerated, constant and decelerated, this method is not easy since it implies knowing the distance in each type of movement, another method would be that the two traffic lights were in green so that the vehicle can run with constant speed throughout the trajectory
What are some limitations to an H-R diagram
When the Northern hemisphere is tilted towards the sun, it is ___ in the northern hemisphere and ___ in the southern hemisphere
Summer in the northern
Winter in the southern
electric bulb connected to a 220 volt supply line draw a current of 0.05 ampere calculate the amount of coulomb super second following to the bulb
You don't need to calculate anything.
You said "0.05 Ampere".
"Ampere" means "coulomb per second".
How RLC circuit is used?
Answer:
Explanation:i s an oscillating circuit consisting of a resistor, capacitor, and inductor connected in series. ... The voltage in the capacitor eventually causes the current flow to stop and then flow in the opposite direction. The result is an oscillation, or resonance.
1. In boxing, fighters wear padded gloves to protect their hands. Which statement explains why a fighter’s hands need protection?
A. There is an equal and opposite velocity impact the hand.
B. There is an equal and opposite acceleration impact the hand.
C. There is an equal and opposite momentum impacting the hand.
D. There is an equal and opposite force impacting the hand.
2. Two balls collide. Under which circumstances will they exert equal and opposite forces on each other?
A. If the sustem is closed
B. in all situations
C. If both are moving at the same speed when they collide
D. if they have the same mass
3. In a closed system, how does an increase in mass change the velocity of an impacted object?
A. Velocity decreases to conserve momentum.
B. Velocity may increase or decrease depending on acceleration.
C. Velocity may increase or decrease depending on force.
D. Velocity increases to conserve momentum.
4. Which of the following provides the correct equation for calculating the momentum of an object?
A. p= mv
B. m= DV
C. F= ma
D. m= vp
5. An object with a mass of 50 kg is moving at a velocity of 2 m/s. What is the momentum of the object?
A. 2 kg*m/s
B. 0.04 kg*m/s
C. 100 kg*m/s
D. 25 kg*m/s
6. A large train car moving along a horizontal track rolls into a smaller stationary train car, causing the cars to attach. Which statement best describes the motion of the cars after the connection?
A. The train cars move in the opposite directions from each other.
B. The train cars move together in the opposite direction the large car was moving.
C. The train cars move together in the direction the large car was moving.
D. The train cars both stay stationary.
7. Which equation correctly represents conservation of momentum for two colliding objects?
A. m1a1+m2a2=0
B. m1v1-m2v2=0
C. m1a1-m2a2=0
D. m1v1+m2v2=0
8. How can the sum of two vectors be found?
A. by drawing the vectors perpendicular to each other
B. by adding the numbers representing the vectors' magnitudes
C. by subtracting the numbers of the vectors' magnitudes
D. by drawing the vectors one right after the other
9. How could a closed system be changed without changing the net force on that system?
A. decrese the acceleration only
B. increase the mass and decrease the acceleration by the same numeric values
C. decrease the acceleration and decrease the mass by the same numeric values
D. increase the mass only
10. Which phrase best describes acceleration?
A. the produce of mass and velocity
B. the change in position over time
C. the product of force and distance traveled
D. the change in velocity over time
11. A ball rolls down a hill at constant velocity. Which of the following conditions must be true?
A. The ball will accelerate as gravity pulls it down the hill.
B. The ball has no net force acting on it.
C. There are no forces acting on the ball.
D. The momentum of the ball increases over time.
12. In an experiment, objects 1 and 2 with masses m1 and m2, respectively, collide with each other. The objects have initial velocities v1i and v2i and final velocities v1f and v2f, respectively. Which result would prove conservation of momentum?
A. m1v1i+m2v2i=m1v1f+m2v2f
B. m1v1i+m1v1f=m2v2i+m2v2f
C. m1v1i+m2v2i+m1v1f+m2v2f>0
D. m1v1i+m2v2i+m1v1f+m2v2f=0
Answer:
1.) D. There is an equal and opposite force impacting the hand
2.) B. In all situations
3.) A. Velocity decreases to conserve momentum
4.) A. p=mv
5.) C. 100 kg*m/s
6.) C. The train cars move together in the direction the large car was moving
7.) D. m1v1+m2v2=0
8.) D. By drawing the vectors one right after the other
9.) B. Increase the mass and decrease the acceleration by the same numeric values
10.) D. The change in velocity over time
11.) B. The ball has no net force acting on it
12.) A. m1v1i+m2v2i=m1v1f+m2v2f
Explanation:
Did the practice
(1) The fighters wear padded gloves to protect their hands because there is an equal and opposite force impacting the hand.
(2) The two balls when collide in a closed system will exert equal and opposite force.
(3) When the mass of the object increases, the velocity of the object will decrease to conserve momentum.
(4) The equation for calculating the momentum of an object is P = mv
(5) The momentum of the ball is 100 kg.m/s
(6) The train cars move together in the direction the large car was moving.
(7) The conservation of momentum of two objects is [tex]m_1v_1 - m_2v_2= 0[/tex]
(8) The sum of two vectors can be found by drawing the vectors perpendicular to each other.
(9) A closed system can be changed without changing the net force on the system by increase the mass and decrease the acceleration by the same numeric values.
(10) Acceleration is defined as the change in velocity over time.
(11) As ball rolls down at constant velocity, the ball has no net force acting on it.
(12) The conservation of momentum of the object is [tex]m_1v_1_i + m_2v_2_i = m_1v_1_f + m_2v_2_f[/tex]
(1)
According to Newton's third law of motion, action and reaction are equal and opposite.
The fighters wear padded gloves to protect their hands because there is an equal and opposite force impacting the hand.
(2)
Based on the principles of conservation of linear momentum, the two balls when collide in a closed system will exert equal and opposite force.
(3)
The principles of conservation of linear momentum is written as;
[tex]m_1u_1 + m_2u_2 = m_1v_1 + m_2v_2[/tex]
when the mass of the object increases, the velocity of the object will decrease to conserve momentum.
(4)
The equation for calculating the momentum of an object is written as;
P = mv
(5)
The momentum of the ball is calculated as follows;
P = mv
P = 50 x 2
P = 100 kg.m/s
(6)
For inelastic collision, the collided two objects move in the same direction after collision usually in the direction of heavier object.
The train cars move together in the direction the large car was moving.
(7)
The conservation of momentum of two objects is written as;
[tex]m_1v_1 = m_2v_2\\\\m_1v_1 - m_2v_2 = 0[/tex]
(8)
The sum of two vectors can be found by drawing the vectors perpendicular to each other.
(9)
A closed system can be changed without changing the net force on the system by increase the mass and decrease the acceleration by the same numeric values.
(10)
Acceleration is defined as the change in velocity over time.
(11)
At constant velocity , acceleration = 0
∑F = ma
∑F = m x 0
∑F = 0
Thus, as ball rolls down at constant velocity, the ball has no net force acting on it.
(12)
The conservation of momentum of the object is written as;
[tex]m_1v_1_i + m_2v_2_i = m_1v_1_f + m_2v_2_f[/tex]
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At what time were the racers at the same position?
O 15
O 3s
O 5s
0 4s
A boy scout troop hikes 10.0 km East and then hikes an
additional 7km North. What the total displacement of
the boy scout troop?
Answer:
wouldn't it be 17km?
Explanation:
Since its 10km and 7km it would make 17km in total. sorry if this didnt help i suck at this stuff :/
If I have 10 m 20 N how much work do I have
Answer:
200 joule
Explanation:
force= 20N
distance=10m
work= ?
we know,
work= force×distance
=20N×10m
=200Nm or joule.
if a truck travels 5 kilometres in 10 minutes find the average velocity of the truck?
Answer:
8.33
Explanation:
av= distance travelled /time taken
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.
How long will it take you to reach the cafeteria if it is 75 m away and you can travel at an average speed of 2 m/s down the stairs?
All interactions between the atmosphere and the geosphere involve
gases or particles in air and water
water and living things.
soil and gases or particles in the air
soil and living things
Answer:
The geosphere consists of the solid Earth and the atmosphere consists of the gaseous components in the air. Thus, the answer is C.
Explanation:
Answer:
C
Explanation:
a student drops a tennis ball from rest. the ball falls 13m to the ground.find the final speed of the ball,just before it reaches the ground
[tex] ({v})^{2} - ({v(0)})^{2} = 2 \times a \times ∆x[/tex]
[tex]v = the \: \: speed \: \: before \: \: reaching \: \: ground \\ [/tex]
[tex]v(0) = the \: \: speed \: \: in \: \: the \: \: rest \: \: which \: \: is \: \: zero \\ [/tex]
[tex]a = Acceleration \: = \: Gravity \: \: acceleration = 10 \\ [/tex]
[tex]∆x = covered \: \: distance[/tex]
_________________________________
[tex] {v}^{2} - ({0})^{2} = 2 \times 10 \times 13 [/tex]
[tex] {v}^{2} = 2 \times 2 \times 5 \times 13 [/tex]
[tex]v = \sqrt{ {2}^{2} \times 65 } [/tex]
[tex]v = 2 \sqrt{65} \: \: \frac{m}{s} [/tex]
Done.....♥️♥️♥️♥️♥️
hELP URGENT PLEASEE!!!
Answer:
1. Solid, liquid, gas, plasma
3. latent heat of vaporization
4. melting
6. heat
7. amount of heat transferred when 1g of a substance melts or freezes
Answer:
1. Solid, liquid, gas, plasma
2. In a solid and liquid, the particles are close together. In a solid, the particles are packed close together and are held in a fixed position. ... In liquids, particles are usually almost as close to each other as in solids.
3. latent heat of vaporization
4. melting
5. As the temperature falls, the particles slow down. If a liquid is cooled sufficiently, it forms a solid.
6. heat
7. amount of heat transferred when 1g of a substance melts or freezes
Explanation:
Textbook online
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.