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DENIUS [597]
3 years ago
11

If baseball A is thrown horizontally, it will travel a certain distance horizontally. If the identical baseball B is thrown hori

zontally (from the same height) but with a greater velocity, it will travel _________ horizontal distance and _________ vertical distance.
A. the same; the same
B. a greater; the same
C. a lesser; the same
D. the same; a lesser
Physics
1 answer:
uysha [10]3 years ago
7 0
B. a greater; the same
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A potter's wheel is rotating around a vertical axis through its center at a frequency of 2.0 rev/s. The wheel can be considered
mart [117]

Answer:

\omega_f=12.2954 \,rad.s^{-1}         i.e.

Frequency=1.9569\,rev.s^{-1}

Explanation:

Given:

angular speed,\omega_i =2\times 2\pi \,rad.s^{-1}

mass of the disk, M=4.9\,kg

radius of the disk, R=0.2\,m

mass of the chunk, m=2.7\,kg

radius of the chunk, r=0.04\,m

We know that the angular momentum is given by:

L=I.\omega

and moment of inertia for a disc:

I=\frac{1}{2} m.r^2

According to the conservation of angular momentum, the final angular momentum is equal to the initial angular momentum.

\frac{1}{2} \times M.R^2\times \omega= \frac{1}{2} \times (M.R^2+m.r^2) \omega_f

4.9\times 0.2^2\times (2\times 2\pi)=(4.9\times 0.2^2+2.7\times 0.04^2 )\tiems \omega_f

\omega_f=12.2954 \,rad.s^{-1}

Frequency=1.9569\,rev.s^{-1}

4 0
4 years ago
A typical ultrasound transducer used for medical diagnosis produces a beam of ultrasound with a frequency of 1.0 MHz. The beam t
serg [7]

frequency of the ultrasound given as

f = 1.0 MHz

speed of the wave is

v = 1540 m/s

Now the wavelength is given as

wavelength = \frac{speed}{frequency}

\lambda = \frac{1540}{1\times 10^6}

\lambda = 1.5 mm

now we know that distance between two consecutive antinodes is always half of wavelength

so we have

d = 0.75 mm

3 0
4 years ago
Moving water, like that of a river, carries sediment as it moves along its bed. The faster the water flows, the more sediment th
nikdorinn [45]
Well newton's law is esstenaily how gravity works. so the force in this case water moves, the more the object (sediment) will go farther. And when the force is lessened the object will eventually come to a dead stop. 
4 0
3 years ago
How to start my introduction in science about the history of matter?
postnew [5]
Start with an anecdote, surprising fact or quotes
5 0
3 years ago
You are designing a ski jump ramp for the next Winter Olympics. You need to calculate the vertical height h from the starting ga
Evgen [1.6K]

Answer:

h = 40.37 m

Explanation:

We will apply the law of conservation of energy to the skier in this case, as follows:

Energy\ of\ skier\ at\ the\ gate = Energy\ of\ Skier\ at\ the\ end\\P.E + K.E_{i} = K.E_{f} - W_{friction}\\mgh + \frac{1}{2}mv_{i}^2 = \frac{1}{2}mv_{f}^2 - W_{friction}\\\\mgh = \frac{1}{2}m(v_{f}^2-v_{i}^2) - W_{friction}

where,

m = mass of skier = 77 kg

g = acceleration due to gravity = 9.81 m/s²

vf = final speed = 30 m/s

vi = initial speed = 2 m/s

W_friction = Work done by friction and air resistance = 4000 J

Therefore,

(77\ kg)(9.81\ m/s^2)h = \frac{1}{2}(77\ kg)[(30\ m/s)^2-(2\ m/s)^2] - 4000\ J\\\\h = \frac{34496\ J - 4000\ J}{755.37\ N}\\\\

<u>h = 40.37 m</u>

5 0
4 years ago
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