All categories

3 years ago

A bullet is fired from a gun at 30 angle to the horizontal with a muzzle velocity of 600 m/s.

Physics

1 answer:

boyakko [2]3 years ago

6 0

Answer:

Part a)

Time to reach the maximum height is given as

$t = 30 s$

Maximum height of the bullet is

$H = 4500 m$

Horizontal range of the bullet is

$R = 31177 m$

Part d)

Final velocity of the bullet is v = 600 m/s at 30 degree

Explanation:

A) As we know that velocity of the bullet is

v = 600 m/s

$\theta = 30^0$

So we have

$v_y = v sin\theta$

$v_y = 600 sin30 = 300 m/s$

Now time to reach the maximum height is given as

$0 = 300 - g t$

$t = 30 s$

B) As we know that the object have zero final speed in y direction

$0 - v_y^2 = 2(-g) h$

$0 - 300^2 = (2)(-10)H$

$H = 4500 m$

Now the horizontal displacement of the object in total time of flight is known as range of projectile

So we have

$R = v_x T$

$R = (600 cos30)(2 \times 30)$

$R = 31177 m$

Part d)

As we know that the final height is same as that of initial So it will strike the ground at same velocity as that of initial velocity

So we have

v = 600 m/s at 30 degree

You might be interested in

Compare and contrast climate and weather

Levart [38]

It’s 49% of its original gig hope this helps!

8 0

3 years ago

Read 2 more answers

An astronomer is observing a star which puzzles her. The lines in the star's spectrum indicates that the star is very hot and sh

Firlakuza [10]

Answer:

the stars which are red in color are cool.

Explanation:

The stars which has reddish color are cool in nature while those stars which has white and blue in color are very hot in nature. The stars change its color when they becomes hotter , first the star color reddish when they are cool but with increasing temperature it changes the color from reddish to orange then yellow. After yellow it turns green and finally get blue color when the stars are very very hot.

5 0

3 years ago

A 40 kg girl and an 8.4 kg sled are on the surface of a frozen lake, 15 m apart. By means of a rope, the girl exerts a 5.2 N for

stealth61 [152]

Answer:

(a) $a_s=0.62\frac{m}{s^2}$

(b) $a_s=0.13\frac{m}{s^2}$

Explanation:

(a) According to Newton's second law, the acceleration of a body is directly proportional to the force exerted on it and inversely proportional to it's mass.

$a_s=\frac{F}{m_s}\\a_s=\frac{5.2N}{8.4kg}\\a_s=0.62\frac{m}{s^2}$

(b) According to Newton's third law, the force that the sled exerts on the girl is equal in magnitude but opposite in the direction of the force that the girl exerts on the sled:

$a_g=\frac{F}{m_g}\\a_g=\frac{5.2N}{40kg}\\a_g=0.13\frac{m}{s^2}$

$x_f=x_0+v_0t \pm \frac{at^2}{2}$

For the girl, we have $x_0=0$ and $v_0=0$ . So:

$x_f_g=\frac{a_gt^2}{2}(1)$

For the sled, we have $v_0=0$ . So:

$x_f_s=x_0_s-\frac{a_st^2}{2}(2)$

When they meet, the final positions are the same. So, equaling (1) and (2) and solving for t:

$x_0_s-\frac{a_st^2}{2}=\frac{a_st^2}{2}\\t^2(a_g+a_s)=2x_0_s\\t=\sqrt{\frac{2x_s_0}{a_g+a_s}}\\t=\sqrt{\frac{2(15m)}{0.13\frac{m}{s^2}+0.62\frac{m}{s^2}}}\\t=6.32s$

Now, we solve (1) for $x_f_g$

$x_f_g=\frac{0.13\frac{m}{s^2}(6.32s)^2}{2}\\x_f_g=2.6m\\x_f=2.6m$

5 0

3 years ago

Why is the following situation impossible? The object of mass m = 4.00 kg in Figure P6.10 is attached to a vertical rod by two s

Crank

The situation is impossible mainly because we can't see Figure P6.10 .
It would undoubtedly be the same story on an another planet, until we
see the figure and understand what's going on.

4 0

3 years ago

In severe head-on automobile accidents, a deceleration of 60 g’s or more (1 g 5 32.2 ft/s2) often results in a fatality. What fo

Musya8 [376]

Answer:

The resulting force on the child is 3000 lbf

Explanation:

To find the force that acts on a child of 50 lb with a deceleration of 60 g's, we can use the formula:

Force = mass * acceleration

To find the force in lbf, we need to use the mass in lb and the acceleration in g (standard unit of gravity).

So we have that:

Force = 50 * 60

Force = 3000 lbf

So the resulting force on the child is 3000 lbf.

3 0

3 years ago