Question 1 (1 point)
You pick up a box of books. The box is labeled 50N. What is the actual mass of the
box?
50N
5.1 kg
490 kg
9.8 m/s2

It is an example of rolling friction because balls roll.

Answer is ROLLING

Resulting force is the vector sum of all the forces acting on an object. The resulting net force of →10 N can be represented by ← 63 N and → 73 N

Net force on an object

The net force on an object is the sum of all the forces acting on an object. Resolving the forces in vertical direction and horizontal direction separately gives the net force on the object.

∑Fx = ma

∑Fy = ma

The net force is pointing towards the right and the correct option must contain two horizontal forces whose resultant is towards the right.

Considering following horizontal forces,

← 63 N and → 73 N, the net force = - 63 N + 73 N = 10 N  (→ 10 N)← 97 N and → 87 N, the net force = -97 N + 87 N = -10 N (← 10 N)

Thus, the resulting net force of →10 N can be represented by ← 63 N and → 73 N

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Answer: C, 63N and 73 N

Explanation:

57. A 0.530-kg basketball hits a wall head-on with a forward speed of 18.0 m/s. It rebounds with a speed of 13.5 m/s. The contact time is 0.100 seconds. (a) determine the impulse with the wall, (b) determine the force of the wall on the ball.

Answer: Answer: (a) -16.7 N s; (b) -167 N

Given: m = 0.530 kg; vi = 18.0 m/s; vf = 13.5 m/s; t = 0.100 s

Find: (a) Impulse, (b) Force

(a) Impulse = Momentum Change = m•Delta v = m•(vf - vi)= (0.530 kg)•( -13.5 m/s - 18.0 m/s)

Impulse = -16.7 kg•m/s = -16.7 N•s

where the "-" indicates that the impulse was opposite the original direction of motion.

(Note that a kg•m/s is equivalent to a N•s)



(b) The impulse is the product of force and time. So if impulse is known and time is known, force can be easily determined.

Impulse = F•t

F = Impulse/t = (-16.7 N s) / (0.100 s) = -167 N

where the "-" indicates that the impulse was opposite the original direction of motion. 58. A 4.0-kg object has a forward momentum of 20. kg•m/s. A 60. N•s impulse acts upon it in the direction of motion for 5.0 seconds. A resistive force of 6.0 N then impedes its motion for 8.0 seconds. Determine the final velocity of the object.

Answer: vf = 8.0 m/s

This question is best thought about conceptually using the principle that an objects momentum is changed when it encounters an impulse and the amount of change in momentum is equal to the impulse which it encounters.

Here an object starts with 20 units (kg•m/s) of momentum. It then encounters an impulse of 60 units (N•s) in the direction of motion. A 60-unit impulse will change the momentum by 60 units, either increasing or decreasing it. If the impulse is in the direction of an object's motion, then it will increase the momentum. So now the object has 80 units (kg•m/s) of momentum. The object then encounters a resistive force of 6.0 N for 8.0 s. This is equivalent to an impulse of 48 units (N•s). Since this impulse is "resistive" in nature, it will decrease the object's momentum by 48 units. The object now has 32 units of momentum. The question asks for the object's velocity after encountering these two impulses. Since momentum is the product of mass and velocity, the velocity can be easily determined.

p = m•v
vfinal = pfinal / m = (32 kg m/s) / (4.0 kg) = 8.0 m/s. 59. A 3.0-kg object is moving forward with a speed of 6.0 m/s. The object then encounters a force of 2.5 N for 8.0 seconds in the direction of its motion. The object then collides head-on with a wall and heads in the opposite direction with a speed of 5.0 m/s. Determine the impulse delivered by the wall to the object.

Answer: 53 N•s

Like the previous problem, this problem is best solved by thinking through it conceptually using the impulse-momentum change principle.

Here the object begins with a momentum of 18 units (kg•m/s). The object encounters a force of 2.5 N for 8.0 seconds. This is equivalent to an impulse of 20 units (N•s). Since this impulse acts in the direction of motion, it changes the object's momentum from 18 units to 38 units. A final impulse is encountered when colliding with a wall. Upon rebounding, the object has a momentum of -15 units (kg•m/s). The -15 is the product of mass (3 kg) and velocity (-5 m/s). The "-" sign is used since the object is now moving in the opposite direction as the original motion. The collision with the wall changed the object's momentum from +38 units to -15 units. Thus, the collision must have resulted in a 53-unit impulse since it altered the object's momentum by 53 units. 60. A 46-gram tennis ball is launched from a 1.35-kg homemade cannon. If the cannon recoils with a speed of 2.1 m/s, determine the muzzle speed of the tennis ball.

Answer: 62 m/s

Given: mball = 46 g = 0.046 kg; mcannon = 1.35 kg; vcannon = -2.1 m/s

Find: vball = ???

The ball is in the cannon and both objects are initially at rest. The total system momentum is initially 0. After the explosion, the total system momentum must also be 0. Thus, the cannon's backward momentum must be equal to the ball's forward momentum.

mcannon • vcannon = -mball • vball
(1.35 kg) • (-2.1 m/s) = (0.046 kg) • vball

vball = (1.35 kg) • (2.1 m/s) / (0.046 kg) = 61.63 m/s = ~62 m/s. 61. A 2.0-kg box is attached by a string to a 5.0-kg box. A compressed spring is placed between them. The two boxes are initially at rest on a friction-free track. The string is cut and the spring applies an impulse to both boxes, setting them in motion. The 2.0-kg box is propelled backwards and moves 1.2 meters to the end of the track in 0.50 seconds. Determine the time it takes the 5.0-kg box to move 0.90 meters to the opposite end of the track.

Answer:

Gold is a relatively dense metal because its atoms have more protons then atoms of many other metals

Explanation:

Answer:

Magnetic forces.

When the magnets are put together, the north pole is attracted to the south pole, which the south pole goes toward the opposing pole on the opposite magnet. Complicated, yes, but how magnets work.

I hope this helps!

The rating of the transformers primary and secondary currents will be 360.8A and 180.4A.

How to calculate the current?

From the information given, the rating of the transformer bank is given as 300kVA. The full load primary current will be:

✓3 × V × I = 300 × 10³

✓3 × 480 × I = 300 × 10³

I = 360.8A

Also, the secondary load current will be calculated thus:

Transformation ratio = 240/480 = 0.5

Load current = 360.8 × 0.5

= 180.4 A

In conclusion, primary and secondary currents will be 360.8A and 180.4A.

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Sodium (NA) : it’s outermost electron is 1
It still needs +7for it to be stable
Strontium (sr)

Sulphur(s) : it’s outermost electron is 6 it still needs +2 for it to be stable
Astatine(Ar):

Answer: B replace the battery with a larger one

Explanation: B

Answer:

Replace the wire with one that is thicker.

Explanation:

Answer:   1470 N

Explanation:   mass = 15

                   weight is the product of mass and force due to gravity

                     AS WE KNOW THAT

                        W = mG

                        W = 15 X 9.8

                         W =  1470 N

Answer:

D. Malleable

Explanation:

Gold is metallic, with a yellow colour when in a mass, but when finely divided it may be black, ruby, or purple. It is the most malleable and ductile metal; 1 ounce (28 g) of gold can be beaten out to 300 square feet. It is a soft metal and is usually alloyed to give it more strength.

What’s that? Sorry??

Answer:

Here is what I thought of: Below;

Explanation:

Floods, big or small, can have devastating effects on your home and your family. You can take steps to reduce the harm caused by flooding. Learn how to prepare for a flood, stay safe during a flood, and protect your health when you return home after a flood.

Preparing for a Flood

Learn how to prepare for a flood, including how to create a plan, supplies you’ll need, and getting your home ready.

Floodwater Safety

Floodwater and standing water can be dangerous. Protect yourself and your loved ones from risks brought on by floods.

Returning Home

Returning home after a flood? Be aware that your home may be contaminated with mold or sewage. Take steps to keep yourself and your loved ones safe.

Hope this helps you. :)

Answer: A

Explanation:

The photoelectric effect was first proposed by Einstein. He claimed that when a light wave comes in contact with an electron, it has the ability to strip that electron from its atom. It depends on how much energy the light wave is carrying, and what type of atom the light is hitting. We use the photoelectric effect in garage motion sensors.

Answer:

a) 6m/s, 0m/s, -6m/s

b) 16m, 25m, 16m

Explanation:

For the first part of the problem, use the Kinematic Equation for Final Velocity:

V = Vi + at

You are looking for the final velocities of the times: 2s, 5s, and 8s (plug those in for t). We also know that the acceleration is going down so it is negative (-2 is plugged in for a). 10 is the initial velocity and it is positive.

For the second part of the problem, use the Kinematic Equation for Displacement:

ΔX = Vi(t) + 1/2a(t²)

You are looking for the displacement of the piano at times: 2s, 5s, and 8s (plug in and square at t). Again, the acceleration is negative because it is in the direction of down, so plug -2 in for a. The initial velocity is positive 10. Plugging those numbers in for each variable should get the correct answer.

Hopefully this helped, I went on here in search of an answer and found it out myself and since no one has answered it yet, I'll help someone else out.

Answer:

The acceleration of an object depends directly upon the net force acting upon the object, and inversely upon the mass of the object. As the force acting upon an object is increased, the acceleration of the object is increased. As the mass of an object is increased, the acceleration of the object is decreased.

Explanation:

Answer:

Warmer water cannot hold as much dissolved oxygen as cold water can hold, which would increase the number of hypoxic zones/dead zones.

Winter
Summer
Fall
Spring
I would go with winter

Answer:
= -0.0055


.......

The first reason is that in the past humans didn't necessarily see the connections between the oceans and thus labelled them that way separating them into 5 oceans and the names stuck to this day.

Secondly, while all the oceans of the world constitute one large Ocean, people need some way to identify each part of it since it is easier to think when we have different categories instead of one large category.

Hope that helped!

Answer:

They both have North and South magnetic poles

Explanation:

No matter how a magnet is made or what material it will have both resistance and attraction

Power=P=120WVoltage=V=48VCurrent=I

[tex]\\ \sf\Rrightarrow P=VI[/tex]

[tex]\\ \sf\Rrightarrow 120=48I[/tex]

[tex]\\ \sf\Rrightarrow I=120/48[/tex]

[tex]\\ \sf\Rrightarrow I=2.5A[/tex]

Answer:

If the charges have the same sign, so that qsqt>0, then the potential energy decreases as the charges separate; if the charges have opposite sign, the potential energy increases from negative infinity.

Explanation:

I hope this answered your question!

Answer:

D.physical model

Explanation:

it is the evolution of butterfly

Answer:

A. Inertia

Explanation:

Answer:

A inertia is directly related to mass

Explanation:

inertia

Answer:

The angle between the mirrors is 90°.

Explanation:

Given that,

Number of image = 5

Rahul kept two plane mirrors at a certain angle in front of a burning candle.

We need to find the angle between the mirrors

Using given data

When Rahul kept two plane mirrors at a certain angle in front of a burning candle then see the 5 image of candle in the mirrors.

If rahul kept two plane mirrors at a 90° then we get the 5 image of candle.

Firstly we see the two images in both mirror and now first image of first mirror is see in second mirror and second image of second mirror is see in first mirror.

So, we can say that we see the 5 image of candle in the mirrors.

Hence, The angle between the mirrors is 90°.

Answer:

The work done to the block

See

Workdone is Force×Displacement .

Also work done is total mechanical energy of body

As potential energy is 0

Mechanical energy=Kinetic energy

So option C is correct

Answer:

12m / 7.3*10^-2m/cy = 164.38 cycles.

164.38cy / 2cy/s = 82.2s.

Explanation:

Answer:

Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but a different number of neutrons giving each elemental isotope a different atomic weight.

Explanation:

Answer:

Different isotopes of an element have the same number of protons in the nucleus, giving them the same atomic number, but each element isotope has a different atomic weight due to the different number of neutrons.

Explanation:

I hope my answer helps u :)

5.2 m/s. F=ma so 250=48a. Divide 250 by 48 and get your acceleration

The text that can be inferred from the map is about the crops that are gotten from Africa and how agriculture can be developed in the area.

What is agriculture?

It should be noted that agriculture simply means the planting of crops and rearing of animals for human use.

In this case, the text that can be inferred from the map is about the crops that are gotten from Africa and how agriculture can be developed in the area.

The use of irrigation, and nomadic herding can be sent in Africa. Therefore, this can be the central idea in the text.

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Answer:

Who was involved in the listed keys on the map provided?

What happened to symbols representing goods and resources that come from Africa?

When did commercial plantation agriculture, irrigated agriculture, livestock raising, and Nomadic herding occur in Africa?

Where did cocoa, coffee, rice, and rubber cone originate in Africa?

Why did Africa transpire as commercial plantation agriculture, irrigated agriculture, livestock raising, and Nomadic herding?

How did it change over time?

Explanation:

Answer: Its applied force and friction, The friction is the drag and the applied force is you pushing

Answer:

A moving car possesses mechanical energy due to its motion (kinetic energy). A moving baseball possesses mechanical energy due to both its high speed (kinetic energy) and its vertical position above the ground (gravitational potential energy).

Explanation: