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Sunny_sXe [5.5K]
3 years ago
11

A ball is thrown with a speed of 10 m/s at an angle of 65. which of the following statement describes the motion of the ball at

the top of its trajectory
a. the horizontal component of velocity is increasing
b. the horizontal component of velocity is zero
c. the vertical acceleration is zero
d. the vertical acceleration is constant
Physics
2 answers:
mylen [45]3 years ago
7 0

Answer:

d. the vertical acceleration is constant

Explanation:

initial speed of the ball is

v_i = 10 m/s

angle of projection

\theta = 65 degree

now we will have

v_x = 10 cos65

v_x = 4.23 m/s

v_y = 10 sin65

v_y = 9.06 m/s

also we know that there is no external force on the ball in x direction so the speed in x direction will remain same always while in y direction its speed will change due to gravity

So its acceleration in y direction is constant due to gravity

dlinn [17]3 years ago
3 0
Ans: D
In a projectile motion, horizontal velocity is constant, while the ball is travelling at a constant vertical acceleration due to the gravity (9.81 ms-2 on Earth).
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Answer: A. The total displacement divided by the time and  C. The slope of the ant's displacement vs. time graph.

Explanation:

Hi! The question seems incomplete, but I found the options on the internt:

A. The total displacement divided by the time.

B. The slope of the ant's acceleration vs. time graph.

C. The slope of the ant's displacement vs. time graph.

D. The average acceleration divided by the time.

Now, since we know the ant is travelling at a constant speed, its average velocity V will be expressed by the following equation:

V=\frac{d}{t}

Where:

d is the ant's total displacement

t is the time it took to the ant to travel to the kitchen

Hence one of the correct options is: A. The total displacement divided by the time

On the other hand, this can be expressed by a displacement vs. time graph graph, where the slope of that line leads to the equation written above. So, the other correct option is: C. The slope of the ant's displacement vs. time graph.

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In the Bohr model of the atom, an electron in an orbit has a fixed ____.
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The answer is C. an electron in an orbit has a fixed energy.
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A wooden block has a mass of 562 g and a volume of 72 cm3. What is the density?
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Mass/volume is density so it’s 562g/72cm^3 so it’s roughly 7.805g per cubic centimeter
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A resistor and an inductor are connected in series to a battery. The battery is suddenly removed from the circuit. The time cons
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engineers are using computer models to study train collisions design safer train cars. They start by modeling an elastic collisi
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Answer:

The final velocity of the second car is 57 m/s south.

Explanation:

This is an elastic collision between two train cars. In this case, the total kinetic energy between the two bodies will remain the same.

The formula to apply is :

m_1v_1i +m_2v_2i=m_1v_1f+m_2v_2f

where ;

m_1=mass of object 1\\v_1i=initial  velocity object1\\m_2=mass of object2\\v_2i=initial velocity object 2\\v_1f=final velocity object 1\\v_2f=final velocity object 2

Given in the question that;

m_1=14650kg\\v_1i=18m/s\\m_2=3825kg\\v_2i=11m/s\\v_1f=6m/s\\v_2f=?

Apply the formula as;

m_1v_1i +m_2v_2i=m_1v_1f+m_2v_2f

{14650*18}+{3825*11} = {14650 *6} + {3825 * v₂f}

263700+42075=87900 + 3825v₂f

305775 =87900 + 3825v₂f

305775-87900 = 3825v₂f

217875=3825v₂f

217875/3825 =v₂f

56.96 = v₂f

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