What is the net force and acceleration of a ball of mass 0.750 kilograms that is subjected to forces of 11.00 newtons and 7.00 newtons from opposite directions?

Answers

Answer 1

Answer: m = 0.75kg
F1 = 11N
F2 = 7N

Because forces are in opposite direction, the ball will accelerate in direction of force that has bigger amplitude.

F = m*a
a = F/m
a = (F1-F2)/m
a = 5.333 m/s^2

Answer 2

Answer:

Explanation:

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What is the minimum speed with which he’d need to run off the edge of the cliff to make it safely to the far side of the river? the answer was 6 m/s the world-record time for the 100 m dash is approximately 10 s. given this, is it reasonable to expect brady to be able to run fast enough to achieve brady's leap? a.yes, the obtained speed is less than the world-record.
b.yes, the obtained speed is almost equal to the world-record.
c.no, the obtained speed is greater than the world-record.
d.no, the obtained speed is almost equal to the world-record.

Answers

The answer is

A. Yes, the obtained speed is less than the world record

The explanation:

when the obtained speed is 6 m /s

and the world record speed = distance / time = 100 m / 10 s = 10 m/s

So, Yes, the obtained speed is less than the world record

Not only is it less, its also a reasonable average speed for a somewhat athletic person. Therefore, the leap is entirely possible.

-Samuel Brady gained his lasting notoriety for his leap over the Cuyahoga River around 1780 in what is now Kent, Ohio. After following a band of Indians into the Ohio country, a failed ambush attempt resulted in the band chasing Brady near the Cuyahoga River. To avoid capture, Brady leaped across a 22-foot (6.7 m) wide gorge of the river (which was widened considerably in the 1830s for construction of the Pennsylvania and Ohio Canal) and fled to a nearby lake where he hid in the water under a fallen tree using a reed for air.

Part (a): The minimum speed of Brady should be $\boxed{6\text{ m/s}}$ to cross the cliff.

Part (b): The speed of Brady’s leap is possible to achieve, as it is less than the speed of world record.

Further Explanation:

(a)

Brady jumps from a cliff to go on other side. He crosses $22\text{ ft}$ horizontal distance from a height of $20\text{ft}$ . To jump from cliff, he follows the Newton’s law of motion.

Given:

The horizontal distance is $22\text{ ft}$ .

The vertical distance is $20\text{ft}$ .

Concept:

The horizontal distance in meter is $6.71\text{ m}$ .

The vertical distance in meter is $6.10\text{ m}$ .

To obtain the time of flight, applying one of the equation of motion given as:

$s=ut+(1)/(2)at^2$

Substitute $0\text {m/s}$ for $u$ and rearrange the above equation for $t$ :

$t=\sqrt{(2s)/(a) }$

Substitute $6.10\text{ m}$ for $s$ and $9.81\text{ m}/\text{s}^2$ for $a$ in above equation.

$\begin{aligned}t&=\sqrt{(2*6.10)/(9.81)}\text{ s}\n&=1.12\text{ s}\end{aligned}$

The time of flight and time taken to cover horizontal distance are equal.

Horizontal velocity of Brady given as:

$\begin{aligned}v&=(6.71)/(1.12)\text{ m/s}\n&\approx6\text{ m/s}\end{aligned}$

Thus, the minimum speed of Brady should be $\boxed{6\text{ m/s}}$ to cross the cliff.

(b)

The minimum speed with which Brady is running is $6\text{ m/s}$ .

The speed of world record given as:

$\begin{aligned}V&=(100)/(10)\text{ m/s}\n&=10\text{ m/s}\end{aligned}$

Thus, the speed of Brady’s leap is possible to achieve, as it is less than the speed of world record.

Learn more:

1. Projectile motion of a body: brainly.com/question/11023695

2. Body in pure rolling motion: brainly.com/question/9575487

3. Newton’s law of motion: brainly.com/question/6125929

Answer Details:

Grade: High School

Subject: Physics

Chapter: Kinematics

Keywords:

1780, Brady's Leap, Captain, Sam, U.S. Continental Army, horizontally, cliff, Ohio's Cuyahoga, gorge, leap, 22 ft, 20 ft, minimum, speed, river, 100 m, dash, 10 s, jump, time of flight, vertical and distance.

Which of the following universal forces is the weakest? A) electric
B) gravitational
C) magnetic
D) strong nuclear

I also need some explanation for this one

Answers

Answer:

Option (B)

Explanation:

The gravitational force is usually defined as the force of attraction that occurs due to the presence of the object's mass. The mass of the object and the force of gravity is directly proportional to each other. At the atomic as well as at the subatomic levels, this gravitational force of gravity is comparatively so weak because the masses of these atoms, subatomic particles are extremely very small. This force has a strength of about 10^-40 and this far smaller in comparison to the strength of electromagnetism.

On the other hand, the other universal forces such as the electric force, magnetic and strong nuclear force are very much stronger than the gravitational force. The nuclear force is strongest of all, where it is 100 times stronger than the electromagnetic force and approximately 10^36 times stronger than the gravitational force.

Thus, the correct answer is option (B).

Well, electric and magnetic are actually the same in nature (as basic force in the Universe). The four, in decreasing order of strength, are:
Strong nuclear, Weak nuclear, Electric/Magnetic (in roughly the same range) and Gravitational (much weaker than Electric/Magnetic -- a magnet less than 1 kg beats Earth which is quite a lot of gigatons, roughly)

Geologists cannot yet predict earthquakes because

Answers

Geologists cannot yet predict earthquakes because the earthquakes caused by the movement of plates do not have the precise time and place when will it moves.

Newton’s third law of motion says that for every action there is a(n) and opposite reaction.

Answers

Answer:

"equal"

Explanation:

ed 2021

Answer:

Formally stated, Newton's third law is: For every action, there is an equal and opposite reaction. The statement means that in every interaction, there is a pair of forces acting on the two interacting objects. The size of the forces on the first object equals the size of the force on the second object.

Explanation:

this is what i know but i am sorry if this doesn't help

A worker kicks a flat rock lying on a roof. The rock slides up the incline 10.0 m to the apex of the roof, and flies off the roof as a projectile. What maximum height (in m) does the rock attain? Assume air resistance is negligible, vi = 15.0 m/s, μk = 0.425, and that the roof makes an angle of θ = 42.0° with the horizontal. (Assume the worker is standing at y = 0 when the rock is kicked.)

Answers

The maximum height that the rock attains is : 7.42 m

Given data :

Vi = 15.0 m/s

uk = 0.425

angle made by roof ( θ ) = 42.0°

Calculating the maximum height reached by the rock

First step : calculate the deceleration of the rock

a = g*sinθ + uk * g * cosθ

= 9.8 * sin 42° + 0.425 * 9.8 * cos 42°

= 9.65 m/s²

Applying motion formula

v² = u² + 2as

= 15² - 2 * 9.65 * 10

v = 5.66 m/s

Initial height attained ( h₁ ) = 10 sin θ

= 10 * sin 45°

= 6.69 m

considering vertical height

V (y) = v sin θ

= 5.66 sin 42

= 3.79 m/s

Next step : Calculate height ( h₂ )

v² = u² + 2 a s

0 = 3.79² - 2 * 9.8 * h₂

therefore : h₂ = 0.73 m

The maximum height attained by the rock ( H ) = h₁ + h₂

= 6.69 + 0.73 = 7.42 m

Hence we can conclude thatThe maximum height that the rock attains is : 7.42 m

Learn more about projectile : brainly.com/question/24216590

Answer:

h = 7.42 m

Explanation:

deceleration of the rock

$a = g sin \theta + \mu_kgcos \theta$

$a = 9.8 sin 42^0+0.425* 9.8 * cos 42^0$

a = 9.65 m/s²

using formula

v² = u² + 2 a s

v² = 15² - 2×9.65 × 10

v = 5.66 m/s

the height attained is

h₁ = 10 sin θ

= 10 sin 42

= 6.69 m

now with vertical velocity it will reach to the height h₂

v y = v sin θ

= 5.66 sin 42

= 3.79 m/s

height is

v² = u² + 2 a s

0 = 3.79² - 2 × 9.8 ×h₂

h₂ = 0.73 m

the maximum height is

h = h₁ + h₂

= 6.69 + 0.73

h = 7.42 m

1. What is the bond angle between the hydrogen atoms in an ammonia (NH3) molecule? 2. What is the bond angle between the oxygen atoms in the carbon dioxide molecule? 3. What is the molecular geometry of a methane (CH4) molecule?

Answers

The answer is 107 degrees. The geometric shape for ammonia is Trigonal Pyramidal, even though its electron geometry is “Tetrahedral”. This is because ammonia has a lone pair of electrons that occupy its space like the other 3 hydrogens in the geometric structure.

The answer 180 degrees. This is because of the linear geometric structure of carbon dioxide. The oxygen atom is on either side of the carbon atom, each is bound by a double covalent bond. All the atoms are involved in the bond and there are no one pair electrons.

The answer is tetrahedral geometry. This is because all the 4 valence electrons of the carbon are involved in a bond with a hydrogen atom. The angles in a tetrahedral geometric arrangement, such as in methane, is 109.5 degrees, where the hydrogen atoms are as far apart, from each other, as possible .

1. 107 degrees
2.180 degrees
3.Tethahedral

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