The Sun is

A cannon ball is fired with an initial velocity of 75 m/s at an angle of 58 degree above the ground. What maximum height will it

KiRa [710]

Answer:

h = 206.4 m

range = 515.9 m

Explanation:

from the question we are given the following:

initial velocity (u) = 75 m/s

angle above surface = 58 degrees

acceleration due to gravity (g) = 9.8 m/s^{2}

find the maximum height (h) and the horizontal distance

maximum height (h) = $\frac{u^{2}sinθ^{2} }{2g}$

h = $\frac{75^{2}sin58^{2} }{2 x 9.8}$

h = 206.4 m

the horizontal distance here is the range

range = $\frac{u^{2}sin2θ }{g}$

range = $\frac{75^{2}sin(2 x 58) }{9.8}$

range = 515.9 m

7 0

3 years ago

A tennis ball with a speed of 11.3 m/s is moving perpendicular to a wall. after striking the wall, the ball rebounds in the oppo

Arlecino [84]

To calculate the average acceleration of the ball we use the formula,

$a= \frac{v_{f} -v_{i}}{t}$

Here, $v_{f}$ is the final velocity of the ball and $v_{i}$ is the initial velocity of the ball t is the time in contact with the wall.

Given $v_{i} = 11.3 m/s$ towards the wall and $v_{f} = 7.2207 m/s$

away from the wall and $t=0.00803 s$ .

Substituting these values in above formula , we get

$a=\frac{(-7.2207 m/s)-11.3 m/s}{0.00803 s}$

Here $v_{f}$ is negative because ball is moving away from the wall.

$a= - 2306 .4 \ m/s^{2}$

Therefore, average acceleration of the ball is $- 2306 .4 \ m/s^{2}$ (away from the wall).

4 0

4 years ago

The tools to distinguish the thickness of two objects of thickness of 1.92mm and the other with thickness of 1.93mm is ?

melomori [17]

Answer:

the instrument that gives this precision is the micrometer screw

Explanation:

The high precision measurements of small parts are the general vernier and the micrometer screw.

In these two instruments the same principle is used: there is a fixed rule and a mobile one that increases precision.

Let's analyze the absolute error or precision of each instrument

* For the vernier, the precision of the fixed rule is 1 mm and there are 20 divisions (the most common); therefore the precision of the instrument is

Δx = 1 mm / 20

Δx = 0.05 mm

* For the micrometer screw, the precision of the fida rule is 0.5 mm and the number of divisions is 50, therefore the precision of the screw is

Δx = 0.5mm / 50

Δx = 0.01 mm

consequently the instrument that gives this precision is the micrometer screw

8 0

3 years ago

A 9Ω resistance is cut into three equal parts and connected in parallel. Find the equivalent resistance of the combination.

sammy [17]

Answer:

the ans i 1 ohm

Explanation:

if i cut a resistor of 9 ohm into 3 equal parts then each resistor will have a resistance of 3 ohm and if they are in parallel combination the net resistance will be R

so 1/R=1/R1+1/R2+1/R3

1/R=1/3+1/3+1/3

R=1

7 0

3 years ago

Which of the following quantities are vectors? Select all that apply. Which of the following quantities are vectors? Select all

andrew11 [14]

Answer:

1980 kg m/s due south

8.2 m/s2 north-west

Explanation:

In order a quantity to be a vector, it should both has a magnitude and direction.

27 J/s --> Only magnitude. (Power)

1980 kg m/s due south --> Both magnitude and direction. (Momentum)

8.2 m/s2 north-west --> Both magnitude and direction. (Acceleration)

3.2 mi straight up --> Direction is not clear. (Position)

2.9 m/s2 --> Only magnitude. (Magnitude of acceleration)

293 K --> Only magnitude. (Temperature)

200 s --> Only magnitude. (Time)

5 0

3 years ago