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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:

1.35208 m/s

Explanation:

Speed of the boat = 0.75 m/s

Distance between the shores = 100 m

Time = Distance / Speed

Time=\frac{100}{0.75}=133.33\ s

Time taken by the boat to get across is 133.33 seconds

Point C is 150 m from B

Speed = Distance / Time

Speed=\frac{150}{\frac{100}{0.75}}=1.125\ m/s

Velocity of the water is 1.125 m/s

From Pythagoras theorem

c=\sqrt{0.75^2+1.125^2}\\\Rightarrow c=1.35208\ m/s

So, the man's velocity relative to the shore is 1.35208 m/s

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3 years ago
Suppose the displacement of an object is related to time according to the expression x=By*2, what are the dimensions of B
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Answer:

3

Explanation:

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In what year did the Organization of Petroleum Exporting Countries (OPEC) refuse to sell oil to the U.S. due to political differ
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A) 1973 I believe it had something to do with the Arab wars happening at the time
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3 years ago
A long, solid rod 5.3 cm in radius carries a uniform volume charge density. Part A If the electric field strength at the surface
Blizzard [7]

Answer:

\rho = 7.35\times \muC/m^3

Explanation:

given,

Radius of the solid rod, R = 5.3 cm

Electric field strength,E = 22 kN/C

Let the volume charge density be ρ

From Gauss law

  E = \dfrac{Rl}{2\epsilon_0}

 ε₀ is the permitivity of free space

  R is the radius of the rod

 and also,

\rho=\dfrac{2E\epsilon_0}{R}

ρ is the volume charge density

\rho=\dfrac{2\times 22\times 10^{3}\times 8.854\times 10^{-12}}{0.053}

\rho = 7.35\times 10^{-6}\ C/m^3

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6 0
3 years ago
Find the west component of 45 m 19º S of W
BaLLatris [955]

Answer:

The west component of the given vector is - 42.548 meters.

Explanation:

We need to translate the sentence into a vectoral expression in rectangular form, which is defined as:

(x, y) = (r_{x}, r_{y})

Where:

r_{x} - Horizontal component of vector distance, measured in meters.

r_{y} - Vertical component of vector distance, measured in meters.

Let suppose that east and north have positive signs, then we get the following expression:

(x, y) = (-45\cdot \cos 19^{\circ}, -45\cdot \sin 19^{\circ})\,[m]

(x, y) = (-42.548,-14.651)\,[m]

The west component corresponds to the first component of the ordered pair. That is to say:

x = -42.548\,m

The west component of the given vector is - 42.548 meters.

8 0
3 years ago
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