Physics, 04.07.2019 18:30, yushan2751

Along jumper jumps at a 20-degree angle and attains a maximum altitude of 0.6 m. what is her initial speed? [10m/s] how far is her jump? [6.59m] i need someone to explain to me how to get the answers listed above my showing a detailed step to step process.

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Refer to the diagram shown below.

Assume g = 9.8 m/s² and ignore air resistance.

Let V = the initial speed
Let d = the distance raveled (how far she jumps).

The horizontal velocity is
Vx = V cos(20°) = 0.9397V m/s
The vertical launch velocity is
Vy = V sin(20°) = 0.342V m/s

At maximum height of 0.6 m, the vertical velocity is zero. Therefore
Vy² - 2*(9.8 m/s²)*(0.6 m) = 0
(0.342V m/s)² = 11.76 (m/s)²
0.342V = 3.4293
V = 10.027 m/s

Therefore
Vy = 0.342*10.027 = 3.4239 m/s
Vx = 0.9397*10.027 = 9.4226 m/s

The time to attain maximum height is a half of the total time of travel. This time is given by
Vy - gt = 0
3.4239 = 9.8*t
t = 3.4239/9.8 = 0.3494 s
The total travel time is 2*0.3494 = 0.6988 s

The length of the jump is
Vx*(2t) = (9.4226 m/s)*(0.6988 s) = 6.5845 m

The initial speed is 10.0 m/s (nearest tenth)
The length of the jump is 6.58 m (nearest hundredth)
Along jumper jumps at a 20-degree angle and attains a maximum altitude of 0.6 m. what is her initial

Along jumper jumps at a 20-degree angle and attains a maximum altitude of 0.6 m. what is her initial

answered: Guest

here we know that ball will drop down by total distance 3.2 m

so here we know that

$v_{yi} = 0$

$\delta y = - 3.2 m$

now using kinematics

$\delta y = v_{yi} t + \frac{1}{2}at^2$

$-3.2 = 0 -\frac{1}{2}(9.8) t^2$

$t = 0.81 s$

now in the same time it will cover horizontal distance of 0.75 m

$\delta x = 0.75m$

so speed of the ball will be

$v = \frac{delta x }{\delta t}$

$v = \frac{0.75}{0.81} = 0.93 m/s$

answered: Guest

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

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Along jumper jumps at a 20-degree angle and attains a maximum altitude of 0.6 m. what is her initial...