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Scilla [17]
3 years ago
6

A pitcher throws a 0.140 kg baseball, and it approaches the bat at a speed of 35.0 m/s. The bat does Wnc = 75.0 J of work on the

ball in hitting it. Ignoring air resistance, determine the speed of the ball after the ball leaves the bat and is 25.0 m above the point of impact.(Answer in m/s)
Physics
1 answer:
Eva8 [605]3 years ago
3 0

Answer:

The speed of the ball is 42.5 m/s

Explanation:

The initial kinetic energy of the ball is:

K_1=\frac{1}{2} m v_0^2=\frac{1}{2}*0.140 kg*(35.0 m/s)^2= 85.75 J

The speed of the ball after leaving the bat is:

K_2=K_1+W_{nc}\\ \frac{1}{2}mV^2= 85.75 J + 75 J\\ (\frac{1}{2}mV^2)2=( 160.75 J)2\\ mV^2= 321.5 J\\ V^2= \frac{321.5 J}{0.140kg} \\ V=\sqrt{\frac{321.5 J}{0.140kg}}

V=47.92 m/s

Using kinematic equation we can find the speed of the ball after being 25 m above the point of collision:

V_f^2-V^2=-2gh

V_f^2-(47.92 m/s)^2=-2*9.81m/s^2*25m

V_f^2=-2*9.81m/s^2*25m+(47.92 m/s)^2

V_f=\sqrt{-2*9.81m/s^2*25m+(47.92 m/s)^2}

V_f=42.5m/s

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A tuning fork with a frequency of 512 Hz is used to tune a violin. When played together, beats are heard with a frequency of 4 H
Ganezh [65]

Answer:

<em> 508Hz</em>

Explanation:

A tuning fork with a frequency of 512 Hz is used to tune a violin. When played together, beats are heard with a frequency of 4 Hz. The string on the violin is tightened and when played again, the beats have a frequency of 2 Hz. The original frequency of the violin was ______.

When two sound waves of different frequency approach your ear, the alternating constructive and destructive interference causes the sound to be alternatively soft and loud - this phenomenon is beat production

frequency is the number of oscillation a wave makes in one seconds.

f1-f2=beats

therefore f1=512Hz

f2=?

beats=4Hz

512Hz-f2=4Hz

f2=512-4

f2=508Hz

the original frequency of the violin is 508Hz

6 0
3 years ago
what particle moves from one object to another so that the object is either positively charged or negatively charged
dmitriy555 [2]

Answer:

electrons move causing the object to be positive or negative charged

8 0
3 years ago
A concrete slab of mass 200kg pulled 10m up a slop at an angle of 30 degree to the horizontal ,coefficient of friction (kinetic
VARVARA [1.3K]

Answer:

= 26.94 m/s

Explanation:

given,

angle of inclination = 30°

mass of the sleigh = 200 kg

coefficient of kinetic friction = 0.2

height of inclination = 10 m

pull force be = 5000 N

now,.

T - f_s - mg sin \theta = m aT−f

s

−mgsinθ=ma

T - \mu N - mg sin \theta = m aT−μN−mgsinθ=ma

T - \mu mg - mg sin \theta = m aT−μmg−mgsinθ=ma

a = \dfrac{T}{m} - \mu g - g sin \thetaa=

m

T

−μg−gsinθ

a = \dfrac{5000}{200} - \0.2\times 9.8 - 9.8 \times sin 30^0a=

200

5000

−\0.2×9.8−9.8×sin30

0

a = 18.14\ m/s^2a=18.14 m/s

2

L = \dfrac{10}{sin 30}L=

sin30

10

L = 20 m

v² = u² + 2 as

v² = 0 + 2 x 18.14 x 20

v = 26.94 m/s

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3 years ago
What is the Einstein Rosen Bridge Theory? Is it possible why or why not? (IN YOUR OWN WORDS ANYTHING ELSE WILL BE DELETED)
kotegsom [21]

That states that the blackhole ends are working like bridges between one space to another.

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This may be possible

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2 years ago
List three things that can affect an objects resistance.
DENIUS [597]

Answer:

The amount of air resistance an object experiences depends on its speed, its cross-sectional area, its shape and the density of the air.

Explanation:

5 0
3 years ago
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