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Aleks04 [339]
4 years ago
14

a footballer kicks a ball vertically upwards. initially, the ball is stationary. his boot is in contact with the ball for 0.05s.

the average resultant force on the ball during this time in 180N. the ball leaves his foot at 20m/s. calculate the height to which the ball rises. ignore air resistance.
Physics
2 answers:
taurus [48]4 years ago
8 0
Kick Ball force average 200
lozanna [386]4 years ago
4 0

Answer:

The ball rises to a height of 20.4 meters.

Explanation:

Since we know the speed at which the ball starts rising, we can ignore the other data. The height reached by the ball can be obtained using the kinematics equation:

v^{2}=v_0^{2}-2gy

Since the velocity at the highest point is zero, we can solve for the height y at that point:

y=\frac{v_0^{2}}{2g}

Plugging in the given value for the initial velocity, and assuming that the acceleration due to gravity g is 9.8m/s², we obtain:

y=\frac{(20m/s)^{2}}{2(9.8m/s^{2})}\\\\y=20.4m

It means that the ball rises to a height of 20.4 meters.

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Light of wavelength 633 nm falls on a single slit 0.5 mm wide and forms a diffraction pattern on a screen 1.0 m away from the sl
andrey2020 [161]

Answer:

The position of the first dark spot on the positive side of the central maximum is 1.26 mm.

Explanation:

Given that,

Wavelength of light is 633 nm.

Slit width, d = 0.5 mm

The diffraction pattern forms on a screen 1 m away from the slit. We need to find the position of the first dark spot on the positive side of the central maximum.

For destructive interference :

\dfrac{dY}{D}=n\lambda

Y is the distance of the minima from central maximum

Here, n = 1

Y=\dfrac{n\lambda D}{d}\\\\Y=\dfrac{1\times 633\times 10^{-9}\times 1}{0.5\times 10^{-3}}\\\\Y=0.00126\ m\\\\Y=1.26\times 10^{-3}\ m\\\\Y=1.26\ mm

So, the position of the first dark spot on the positive side of the central maximum is 1.26 mm.

4 0
3 years ago
HELP PLEASE!!!!!!!
Roman55 [17]

The silver substance is most likely a metal. Your answer is A.

8 0
3 years ago
Read 2 more answers
Help pls☹️☹️☹️☹️☹️<br> anyone
Alex17521 [72]
Most of the question 1 is chopped off so I'll try my best to answer.

1ai) In a telephone, the sound is converted into electrical signals before being sent through the wire before converted back into sound.

1aii) Sound travels by the collision between particles. In solids, the particles are closely packed (as compared to air molecules) and thus collide with their neighbors quickly after being disturbed, allowing for sound to be passed on at a faster rate.

b) Can't help much on this one.  
4 0
3 years ago
A ladybug crawls vertically on a leaf. Its motion is shown on the following graph of vertical position y vs. time t. What is the
ella [17]

Answer: 0 m/s

Explanation: The attached figure shows the position-time graph of a ladybug. We need to find the average speed of the ladybug between t = 4 s to t = 7 s.

We know that, the slope of a position-time graph gives velocity of an object. It can be given by :

In this case, the position of a ladybug at t = 4 s and at t = 7 s is the same i.e. 2 m.

It means its velocity is equal to at this time or we can say that ladybug is at rest.

7 0
3 years ago
Please help i am so confused
Anna11 [10]
B is the only answer that makes sense.
A that would mean the car only moves 5 mi/hr
C just doesn't make sense
D the equation never mentions the velocity changing
8 0
4 years ago
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