Physics, 13.09.2019 16:30 homework1911

Aman stands on top of a 25 m tall cliff. the man throws a rock upwards at a 25 degree angle above the horizontal with an initial velocity of 7.2 m/s. what will be the vertical position of the rock at t = 2 seconds? what will be the horizontal position of the rock at that time?

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Answer from: coolkitty35

a) vertical position at 2s: 50.68 m

b) horizontal position at 2s: 13.05 m

Explanation:

This situation is a good example of the projectile motion or parabolic motion, in which the travel of the rock has two components: x-component and y-component. Being the equations to find the position as follows:

x-component:

$x=V_{o}cos\theta t$ (1)

Where:

$V_{o}=7.2 m/s$ is the rock's initial speed

$\theta=25\°$ is the angle at which the rock was thrown

t=2 s is the time

y-component:

$y=y_{o}+V_{o}sin\theta t-\frac{gt^{2}}{2}$ (2)

Where:

$y_{o}=25 m$ is the initial height of the rock

is the height of the rock at 2 s

$g=9.8m/s^{2}$ is the acceleration due gravity

Knowing this, let's begin with the answers:

a) Vertical position at 2 s:

$y=25 m+(7.2 m/s)sin(25\°) (2 s)-\frac{(9.8m/s^{2})(2)^{2}}{2}$ (3)

y=25 m+6.085 m-19. 6 m (4)

y=50.68 m (5) This is the vertical position at 2 s

b) Horizontal position at 2 s:

$x=(7.2 m/s) cos(25\°) (2 s)$ (5)

x=13.05 m (6) This is the horizontal position at 2 s

Answer from: justinbailey96

Explanation:

It is given that,

Position of the man, h = 25 m

Initial velocity of the rock, u = 7.2 m/s

The rock is thrown upward at an angle of 25 degrees.

(a) Let y is the vertical position of the rock at t = 2 seconds. Using the equation of kinematics to find y as :

$y=-\dfrac{1}{2}gt^2+u\ sin\theta\ t+h$

$y=-\dfrac{1}{2}\times 9.8(2)^2+7.2\ sin(25)\times 2+25$

y = 11.48 meters

(b) Let x is the horizontal position of the rock at that time. It can be calculated as :

$x=u\ cos\theta \times t$

$x=7.2\ cos(25)\times 2$

x = 13.05 meters

Hence, this is the required solution.

Answer from: Quest

an ion is a charged atom or molecule. it is charged because the number of electrons do not equal the number of protons in the atom or molecule. an atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

Answer from: Quest

electrical potential energy =0.072 j

explanation:

electrical potential energy is given by

u= q δv

q= charge=6 c

δv= potential difference and is given by

δv= e d

e= electric field

d= distance=5 mm=0.005 m

δv=2.4 (0.005)=0.012 v

now electric potential energy= u= q δv

u=6 (0.012)

u=0.072 j

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Aman stands on top of a 25 m tall cliff. the man throws a rock upwards at a 25 degree angle above th...