Answer:
Not accounting for friction, the ball would be falling at 14.0 m/s
Explanation:
Without a coefficient of kinetic friction being provided, we'll have to assume zero friction between the ball and the air.
In that case, the ball's horizontal speed will remain 10 m/s. To find it's velocity in five seconds then, we just need to take gravity into account.
Let's assume acceleration from gravity is 9.8 m/s². We can simply multiply that by five seconds to find out how fast it's going at that point:
[tex]9.8\frac{m}{s^2} \times 5s\\= 49 \frac{m}{s}[/tex]
So at five seconds, the ball is moving horizontally at 10 m/s and vertically at 479 m/s.
Now we can simply take the hypotenuse between those two vectors to get the actual speed:
[tex]s = \sqrt{9.8^2 + 10^2}\frac{m}{s}\\s = \sqrt{96.04 + 100}\frac{m}{s}\\s = \sqrt{196.04}\frac{m}{s}\\s = 14.0 \frac{m}{s}\\[/tex]
So lacking air to slow it down, the ball would be going at approximately 14.0 metres per second.
QUESTION 2 DOK 3 A Thompson's gazelle has a maximum acceleration of 4.5 m/s2 At this acceleration, how much time is required for it to reach a speed of 40 km/h?
Answer:
2.47 s
Explanation:
Convert the final velocity to m/s.
40 km/h → 11.1111 m/sWe have the acceleration of the gazelle, 4.5 m/s².
We can assume the gazelle starts at an initial velocity of 0 m/s in order to determine how much time it requires to reach a final velocity of 11.1111 m/s.
We want to find the time t.
Find the constant acceleration equation that contains all four of these variables.
v = v₀ + atSubstitute the known values into the equation.
11.1111 = 0 + (4.5)t 11.1111 = 4.5t t = 2.469133333The Thompson's gazelle requires a time of 2.47 s to reach a speed of 40 km/h (11.1111 m/s).
A 60 kg swimmer suddenly dives from a 150 kg raft with a speed of 1.5 m/s. The raft is initially at
rest. What is the speed of the raft immediately after the diver jumps if the water has negligible
effect on the raft?
Answer:
v2 = 0.6 m/s in opposite direction
Explanation:
The computation of the speed of the raft is as follows
The center of system mass would be remains at the same place also it has no external force applied
Therefore
V = 0
So,
M1.V1= - (M2.V2)
where,
M1 = 60 kg, V1 = 1.5 m/s
M2 = 150 kg
Now
60 × 1.5 = - 150 × v2
v2 = -0.6 m/s
v2 = 0.6 m/s in opposite direction
Using the rules for significant figures, what do you get when you multiply 67.6 by 1.2?
Answer:
81
Explanation:
The problem here is to use the rules for significant figures in the multiplication below.
67.6 x 1.2:
This product will yield an answer that will produce the least number of significant figures.
67.6 has 3 significant figures; 6, 7 and 6
1.2 has 2 significant figures; 1 and 2
The product must give us an answer of two significant figures:
67.6 x 1.2 = 81.12 to 2significant figures gives 81
The solution to this problem is 81
Jennifer and katie stand and lean on each other. Jennifer weighs 150 pounds and katie weighs 120 pounds.
Answer:
Jennifer
Explanation:
she has more mass which means she is using more force
A force of 100.0N accelerates a 5.0 kg box at 15.0 m/s^2 along a level surface. Find the coefficient of sliding friction for the box. After that, how far will the box have gone after 5.0 seconds of pulling it?
By balancing the force, we get :
100 - Frictional Force = ma
100 - μmg = ma
100 - μ(5)(10) = (5)(15)
50μ = 25
μ = 0.5
Distance travelled by box in 5 seconds is :
[tex]d = ut + \dfrac{at^2}{2}\\\\d = 0 + \dfrac{15\times 5^2}{2}\\\\d = 187.5\ m[/tex]
Hence, this is the required solution.
Earth travels fastest in January and slowest in July. What is the most likely explanation for this?
A. Earth is nearest the Sun in July and farthest away in January.
B. Earth is nearest the Sun in January and farthest away in July.
C. Earth is nearest the Sun in April and farthest away in October.
D. Earth is nearest the Sun in October and farthest away in April.
Answer:
Earth is nearest the Sun in July and farthest away in July.
Explanation:
Answer:
Correct Answer: B.
Explanation:
Earth is nearest the Sun in January and farthest away in July. Explanation: According to Kepler's Second Law, a planet travels fastest when it is nearest its sun. This means that Earth is actually closest to the Sun in January, when it is winter in the northern hemisphere!
The purpose of a cell phone cover is to protect your phone from impact forces. How does a cell phone case do this?
Answer:
the material of the phone case
The purpose of a cell phone cover is to protect your phone from impact forces. It is done by absorbing the impact of force by back cover.
What is Force ?
Force is responsible for the motion of an object. it produces acceleration in the body. According to newton's second law force is mass times acceleration i.e. F =ma. Its SI unit is N which is equivalent to kg.m/s².
The case is made in such a way that, if the cell phone is dropped, the cover will absorb the kinetic energy of the falling phone by the means of deforming without transferring the impact onto the phone.
Cell phone cover is made up of rubber which can restore the forces like a spring. when u apply force to the rubber it get displaced and applied force is stored in the rubber. when cell phone drops, rubber of the cover absorbs the energy of impact. it also provides shied protection to the phone.
Hence this is how cell phone case do this.
To know more about force, click :
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Which item rotates in a magnetic field as an electric motor produces kinetic energy.
A. Lightbulb
B. Loop of wire
C. Battery
D. Permanent magnet
Answer:
Loop of Wire
Explanation:
what do you think president biden should say in his inaugural speech to unify the country’s
Answer:
If you haven't heard, Joe Biden would like to unite America.
It was a focus of the Democrat's campaign. It's even the theme of Biden's inauguration — "America United."
The inaugural committee says the slogan "reflects the beginning of a new national journey that restores the soul of America, brings the country together, and creates a path to a brighter future."
If only it were that easy.
When Biden is sworn in at 12:01 p.m. ET Wednesday as the 46th president of the United States, it will be with the understanding that the country is as divided as it's ever been, as pessimistic as it's been in three decades and facing health, economic and racial crises.
It will also be a very different inauguration than has ever been seen in U.S. history. Four years ago, President Trump was arguing over his crowd size compared with Barack Obama's record-setting turnout of supporters on the National Mall.
Explanation:
btw i would rather have him as president
What effect does noise have on different types of signals?
A. It distorts digital signals, making them unreliable.
B. It distorts analog signals, making them unreliable.
C. Noise has no effect on either analog or digital signals.
D. Noise prevents the transmission of both analog and digital
signals.
Answer: it is actually B. :)
Explanation:
Noise can distort analog signals making them unreliable.
What is noise?The random or unwanted signal that mixes up with the original signal is called noise. Noise is an unwanted signal that interferes with the original message signal and causes the message signal's parameters to be corrupted. The message is transformed as a result of this change in the communication process. It's most likely to be inputted at the receiver or channel.Noise can actually bury, distort or cause interference to the analog signal carrying the intelligent information.
What is analog signal?A signal in which a characteristic grows and decreases in lockstep with the object being sent is known as analog signal. The power of the radio wave, for example, rises and falls in accordance with the loudness of the original sound in AM radio.Hence, the correct answer is B.
To know more about Noise here
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A 2.0 kg block is pulled across a horizontal surface by a 15 N force at a constant velocity. What is the force of friction acting on the block?
Answer:
The force of friction acting on the block has a magnitude of 15 N and acts opposite to the applied force.
Explanation:
Net Force
The Second Newton's law states that an object acquires acceleration when an unbalanced net force is applied to it.
The acceleration is proportional to the net force and inversely proportional to the mass of the object.
If the object has zero net force, it won't get accelerated and its velocity will remain constant.
The m=2 kg block is being pulled across a horizontal surface by a force of F=15 N and we are told the block moves at a constant velocity. This means the acceleration is zero and therefore the net force is also zero.
Since there is an external force applied to the box, it must have been balanced by the force of friction, thus the force of friction has the same magnitude acting opposite to the applied force.
The force of friction acting on the block has a magnitude of 15 N opposite to the applied force.
Will give brainliest!! Pls answer! HELP ME!!!!!!
Answer:
See the explanation.
Explanation:
Q9. Irregular reflection happens when a set of parallel beams are reflected from non-smooth surface which results in non-parallel reflected beams.
Q10.
i) Periscope
ii) There are different types of periscopes but the main characteristic of this instrument is observation over the obstacles or in general objects that are not in the line-of-sight. Basic Periscope uses parallel angled mirrors to project objects that are above the surface in submarines.