Answer:
You are given that the mass of the clock M is 95 kg.
This is true whether the clock is in motion or not.
Fs is the frictional force required to keep the clock from moving.
Thus Fk = uk W = uk M g the force required to move clock at constant speed. (the kinetic frictional force)
uk = 560 N / 931 N = .644 since the weight of the clock is 931 N (95 * 9.8)
us is the frictional force requited to start the clock moving
us = static frictional force = 650 / 931 -= .698
The center of mass of a cow and the center of mass of a tractor are 208 meters apart. The magnitude of the gravitational force of attraction between these two objects is calculated to be 1.8 × 10-9 newtons.
What would the magnitude of the gravitational force of attraction be between these two objects if they were 416 meters apart?
A.
1.62 × 10-9 newtons
B.
3.6 × 10-10 newtons
C.
9 × 10-10 newtons
D.
4.5 × 10-10 newtons
Answer:
Choice: D.
Explanation:
Newton’s Law of Universal Gravitation
It states that objects attract each other with a force that is proportional to their masses and inversely proportional to the square of the distance between them. The formula is:
[tex]\displaystyle F=G{\frac {m_{1}m_{2}}{r^{2}}}[/tex]
Where:
m1 = mass of object 1
m2 = mass of object 2
r = distance between the objects' center of masses
G = gravitational constant: [tex]6.67\cdot 10^{-11}~Nw*m^2/Kg^2[/tex]
The center of mass of a cow is at a distance of r=208 m from the center of the mass of a tractor. The gravitational force of attraction is [tex]F=1.8\cdot 10^{-9}\ N[/tex]. It's required to find the new force of attraction F' if the distance was r'=416 m.
It can be noted that r'=2r. If the distance is doubled, the new force is:
[tex]\displaystyle F'=G{\frac {m_{1}m_{2}}{(2r)^{2}}}[/tex]
[tex]\displaystyle F'=\frac{1}{4}G{\frac {m_{1}m_{2}}{r^{2}}}[/tex]
Substituting the original value of F:
[tex]\displaystyle F'=\frac{1}{4}\cdot 1.8\cdot 10^{-9}\ N[/tex]
Operating:
[tex]\displaystyle F'=4.5\cdot 10^{-10}\ N[/tex]
Choice: D.
You have to balls heading towards you. One of them is football (lighter with higher velocity) and the other one is a bowling ball (heavier with lower velocity). They have the same momentum. There are no other variables included. Which one would be easier to catch. Explain why.
Answer:
The Football
Explanation:
They have the same velocity, but different shapes and weight. Although the balling ball would be easier to stop (due to slow velocity), but if you see a bowling coming your way in the air, GET OUT OF THE WAY!
When is it clear that a balanced force are acting on an object?
If a 1 kg book has 46 Joules of gravitational potential energy how high is the shelf it is on?
g = 9.8 m/s^2 KE = ½ mv^2 PE = mgh
Answer:
4.7m
Explanation:
Given parameters:
Mass of the book = 1kg
Gravitational potential energy = 46J
Unknown:
Height of the shelf = ?
Solution:
The potential energy is due to the position of a body above the ground.
Gravitational potential energy = mgh
m is the mass,
g is the acceleration due gravity = 9.8m/s²
h is the height which is unknown
46 = 1 x 9.8 x h
h = 4.7m
What effect does inertia have on the motion of an object?
Answer:
Inertia is the tendency of an object to resist a change in its motion. Because of inertia, a resting object will remain at rest, and a moving object will keep moving. Objects with greater mass have greater inertia
List ten different muscles of the body and label what type of muscle it is.
Answer:
Masseter
The masseter runs from the temporal bone (that forms part of the sides and base of the skull) to the lower jaw (the mandible). It lifts the lower jaw, to close the mouth. The masseter is the strongest muscle in your body.
Temporalis
The temporalis begins on two bones of the skull, at the front (the frontal) and at the side and base (the temporal). It runs to the top of the lower jaw (the mandible). Like the masseter, the temporalis helps close the mouth.
Deltoid
The deltoids are the triangular muscles of the shoulder. The strongest point is the central section, which raises the arm sideways. The front and back parts of the muscle twist the arm. Deltoid comes from the Greek word deltoeides, meaning shaped like a (river) delta, which is triangular.
Pectoralis major
(The pecs!) The pectoralis major is a large, fan-shaped muscle. It covers much of the front upper chest, beginning at the breastbone (or sternum) including the second to the sixth ribs.
Adductor Longus
The adductor longus is located on the inner thigh. Adduct means move, so this muscle allows the thigh bone (the femur) to move inward and to the side.
Soleus
Located in the lower leg, the soleus runs from the lower leg bones (the tibia and fibula) to the heel (the calcaneus). The soleus muscle flexes the foot by moving the foot at the ankle. It also helps circulation by pumping blood back up towards the head.
Biceps brachii
The biceps brachii runs from the shoulder to the elbow. It is attached to the shoulder blade (the scapula), and extends along the front surface of the upper arm bone (the humerus). When the bicep contracts, the arm bends at the elbow. Notice that humerus sounds like humour – we call this area of the elbow the funny bone.
The Buccinator
The buccinator muscle compresses the cheek. This muscle allows you to whistle, blow, and suck; and it contributes to the action of chewing.
The Suprahyoid
The suprahyoid muscles raise the hyoid bone, the floor of the mouth, and the larynx during deglutition.
The Splenius
The splenius muscles originate at the midline and run laterally and superiorly to their insertions. From the sides and the back of the neck, the splenius capitis inserts onto the head region, and the splenius cervicis extends onto the cervical region. These muscles can extend the head, laterally flex it, and rotate it.
Why are the magnet domains in a paper clip lined up
Q2) A salesman travels a distance of 50km in 2 hours and 30 minutes. How much faster, in kilometers per hours, on an average, must he travel to make a trip in 5/6 hours less time)
A) 10
B) 20
C) 30
D) None of these
Explain how you got your answer
Answer:
30 maybe?
Explanation:
Answer:- 30 km/hr
Given :- Distance covered by Salesman 50 km
Time taken;- 2 hrs and 30 minutes
Speed of salesman: Distance/ time taken
50 / 2 1/2 = 20 km/hr
He has make it 5/6 less
2 1/2 —5 / 6 = 5 / 3 hrs
Speed : Distance / Time
50 km / 5/3 = 30
He has to travel at 30 km per hour.
Which of the following situations describes a non-contact force acting on an object?
I think its "a dropped penny sinks at the bottom of a pond". Because, non-contact force is a force that you don't touch, like gravity or weight, that falls but you didn't drop it on purpose nature did or gravity itself did.
A force of 2700 N is exerted on a car by a tow truck. The car accelerated at a rate 1.63 m/s? What is the mass of the car?
Round the the 2nd decimal places!
Answer:
1656.44 kgExplanation:
The mass of the car can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{2700}{1.63} \\ = 1656.4417...[/tex]
We have the final answer as
1656.44 kgHope this helps you
What is the magnitude of the centripetal
force that must be applied in order for a
0.5 kg ball on a 2.0 m string to spin with
uniform circular motion at 5.0 m/s?
Answer:
Explanation:
6.25
The magnitude of the centripetal force that must be applied is 6.25 N.
The given parameters;
mass of the object, m = 0.5 kgvelocity of the object, v = 5 m/sradius of the string, r = 2 mThe magnitude of the centripetal force that must be applied is determined by the product of the mass of the object and the centripetal acceleration.
The centripetal force is calculated as follows;
[tex]F_c = ma_c = \frac{mv^2}{r} \\\\F_c = \frac{0.5 \times 5^2}{2} \\\\F_c = 6.25 \ N[/tex]
Thus, the magnitude of the centripetal force that must be applied is 6.25 N.
Learn more here: https://brainly.com/question/14905888
true or false total distance of amoving body can be negative
Answer:
False
Explanation:
the total distance of a moving body is always positive
Distance is the total distance between any two points
A toy car is allowed to travel down a ramp. The car travels 1.8 m is 4
seconds. What is the speed of the car?*
Answer:
0.45m/s
Explanation:
Given parameters:
Distance = 1.8m
Time = 4s
Unknown:
Speed of the car = ?
Solution:
The speed of a body is the distance divided by the time.
Speed = [tex]\frac{distance}{time}[/tex]
So;
Speed = [tex]\frac{1.8}{4}[/tex] = 0.45m/s
I NEED HELP ASAP PLEASE!
Question 6 of 10
What is the slope of the line plotted below?
O A. 1
O B. -0.5
O C. 0.5
O D. 2
1. How do humans get energy from food?
A Small intestine is where most food is first taken into cells
B. There can be thousands of mitochondria inside cells
Waste products like carbon dioxide are released through the lungs
D Energy is released through a series of steps in the form of ATP
please help this is due today
Answer:
A
Explanation:
I took that test
Answer:
D
Explanation:
Through the process of cellular respiration, Energy in food is converted into energy that can be used by the body.
During cellular respiration, glucose and oxygen are converted into carbon dioxide and water, energy is transferred to ATP
A ball with a mass of 0.7 kg is thrown straight upward, flies up to its maximum height, and
then falls back down. If the ball was initially thrown with a kinetic energy of 250.1 joules,
how much potential energy will the ball have at its maximum height? Round your answer to
the tenths place.
Answer:
250.05 J
Explanation:
From the question given above and, the following data were obtained:
Mass (m) = 0.7 kg
Kinetic energy (KE) = 250.1 J
Potential energy (PE) =?
Next, we shall determine the velocity of the ball. This can be obtained as follow:
Mass (m) = 0.7 kg
Kinetic energy (KE) = 250.1 J
Velocity (v) =?
KE = ½mv²
250.1 = ½ × 0.7 × v²
250.1 = 0.35 × v²
Divide both side by 0.35
v² = 250.1 / 0.35
Take the square root of both side
v = √(250.1 / 0.35)
v = 26.73 m/s
Next, we shall determine the maximum height reached by the ball. This can be obtained as follow:
Initial velocity (u) = 26.73 m/s
Final velocity (v) = 0 m/s (at maximum height)
Acceleration due to gravity (g) = 9.8 m/s²
Maximum height (h) =.?
v² = u² – 2gh (since the ball is going against gravity)
0² = 26.73² – (2 × 9.8 × h)
0 = 714.4929 – 19.6h
Collect like terms:
0 – 714.4929 = – 19.6h
– 714.4929 = – 19.6h
Divide both side by –19.6
h = –714.4929 / –19.6
h = 36.45 m
Finally, we shall determine the potential energy of the ball at the maximum height. This can be obtained as follow:
Mass (m) = 0.7 kg
Acceleration due to gravity (g) = 9.8 m/s²
Maximum height (h) = 36.45 m
Potential energy (PE) =?
PE = mgh
PE = 0.7 × 9.8 × 36.45
PE = 250.05 J
Thus, the potential energy at the maximum height is 250.05 J.
An object with a mass of 30 kg moves at a rate of 15 m/S over distance of 10 m. 900 joules of work was done in 10 seconds. What was the power generated by this project?
Answer:
P = 90 W
Explanation:
Mass of an object, m = 30 kg
Speed of the object, v = 15 m/s
Distance, d = 10 m
Work done, W = 900 J
Time, t = 10 s
We need to find the power generated by this project. We know that power is equal to work done divided by time taken.
So,
[tex]P=\dfrac{W}{t}\\\\P=\dfrac{900\ J}{10\ s}\\\\P=90\ W[/tex]
So, the required power generated is 90 W.
How is motion related to balanced and unbalanced forces?
Answer:
When the motion of an object changes, the forces are unbalanced. Balanced forces are equal in size and opposite in direction. When forces are balanced, there is no change in motion.
Explanation:
The planet Mars is located 228 million kilometers (2.28 x 1011 m) away from the sun. If it takes the sun light 760 seconds does light take to reach Mars from the Sun, how fast is the light travelling?
Answer: hey
Explanation:
Describe how charge is transferred from the ruler to the metal rod.
4 properties of light
The battery is made up of three 1.5 V cells.
Calculate the total potential difference of the battery.
Answer: 4.5 V
Explanation:
Given
The voltage of each cell is 1.5 V
If they are connected end to end their potential added to give a higher potential i.e. 1.5+1.5+1.5=4.5 V
Does a Magnesium atom gains 2 electrons in an ionic compound?
Answer:
Yes
Explanation:
Example of ionic bonding takes place between magnesium(mg) and oxygen(02) to form magnesium oxide (mg0).... Magnesium loses two electrons to form Mg2+, and oxygen gains two electrons to form 02-
A researcher asks the same group of kids to define "happiness" when
they were 5 years old, 10 years old, and again at 20 years old. They then
analyzed how the kids' idea of "happiness" changed over the years. This is
an example of which type of study?
case study
cross-sectional study
longitudinal study
naturalistic observation
double blind study
Answer:
naturalistic observation
Explanation:
explain the basic concept that involves projectiles
The thymus gland plays an important role in the developing immune system of a child. It makes infection-fighting lymphocytes called
.
Answer:
give brainliest please
Explanation:
T- lymphocytes or T cells
7) Which statement below best describes the motion of the cart under the conditions shown in the image below?
the magnification produced by a plane mirror is +1. what does this mean?
Answer:
The magnification produced by a plane mirror is +1
means then the size of the image is equal to the size of the object. If m has a magnitude greater than 1 the image is larger than the object, and an m with a magnitude less than 1 means the image is smaller than the object.
what would happen if you try to put two balloons with the same charge together
Answer:
they would repel because they have the same charge. Charges that are different will stick together.
Which of these nebulae is the odd one out?
Answer:
Answer is on the pic
Explanation:
I hope it's helpful!
Answer:
nebula
Explanation:
