PHYSICS HIGH SCHOOL

A ball is thrown at 60 degrees and lands in 18.5 seconds what is the velocity of the ball at the start

Answers

Answer 1

Answer:

Answer:

the initial velocity of the ball is 104.67 m/s.

Explanation:

Given;

angle of projection, θ = 60⁰

time of flight, T = 18.5 s

let the initial velocity of the ball, = u

The time of flight is given as;

$T = (2u* sin(\theta))/(g) \n\n2u* sin(\theta) = Tg\n\nu = (Tg)/(2* sin(\theta)) \n\nu = (18.5 * 9.8)/(2* sin(60^0)) \n\nu = 104.67 \ m/s$

Therefore, the initial velocity of the ball is 104.67 m/s.

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Henrietta is going off to her physics class, jogging down the sidewalk at a speed of 2.70 m/s. Her husband Bruce suddenly realizes that she left in such a hurry that she forgot her lunch of bagels, so he runs to the window of their apartment, which is a height 36.5 m above the street level and directly above the sidewalk, to throw them to her. Bruce throws them horizontally at a time 4.00 s after Henrietta has passed below the window, and she catches them on the run. You can ignore air resistance. Wit what initial speed must Bruce throw the bagels so Henrietta can catch them just before they hit the ground? Where is Henrietta when she catches the bagels?

Answers

Answer:

The velocity is $v = 6.66 \ m/s$

Henrietta is at distance $s= 18.17 \ m$ from the under the window

Explanation:

From the question we are told that

The speed of Henrietta is $v= 2.70 \ m/s$

The height of the window from the ground is $h = 36.5 \ m$

Generally the time taken for the lunch to reach the ground assuming it fell directly under the window is

$t = \sqrt{(2 * h )/(g) }$

=> $t = \sqrt{(2 * 36.5 )/(9,8) }$

=> $t = 2.73 \ s$

Generally the time taken for the lunch to reach Henrietta is mathematically represented as

$T = t + t_1$

Here $t_1$ is the time duration that elapsed after Henrietta has passed below the window the value is given as 4 s

Now

$T = 2.73 + 4$

=> $T = 6.73 \ s$

Generally the distance covered by Henrietta before catching her lunch is

$s= v * T$

=> $s= 2.70 * 6.73$

=> $s= 18.17 \ m$

Generally the speed with which Bruce threw her lunch is mathematically represented as

$v = (18.17)/(2.73)$

$v = 6.66 \ m/s$

Question 2 ) Ally sliced 32 kg of water melon for a party . She divided the watermelon slices equally between 8large bowls. How many grams of watermelon did Ally put in each bowl?

Answers

32kg divided by 8 is equal to 4kg.
4kg converted to grams is:
4 x 1000, so
Ally put 4000 grams of Watermelon in each bowel.

Kinetic energy is dependent on which of the following?A. mass only
B. velocity only
C. temperature only
D. mass and velocity

Answers

Kinetic energy can be found on the equation of (mv^2) /2 = KE therefore the answer is D.

Fun fact: Temperature is the dependent of another form of energy called internal energy.

Draw velocity-ime graph for uniform moion of an object , when initially body is at rest.

Answers

When the body is at rest, its speed is zero, and the graph lies on the x-axis.

When the body is in uniform motion, the speed is constant, and the graph is a horizontal line, parallel to the x-axis and some distance above it.

It's impossible to tell, based on the given information, how these two parts of the
graph are connected. There must be some sloping (accelerated) portion of the graph
that joins the two sections, but it cannot be accounted for in either the statement
that the body is at rest or that it is in uniform motion, since acceleration ... that is,
any change of speed or direction ... is not 'uniform' motion'.

Which statements describe characteristics of all liquids? Check all that apply. Liquids have the ability to change shape. Liquids flow, even with some resistance. Liquids have definite volume. Liquids expand to fill containers. Liquids have molecules that slip past each other.

Answers

Answer;

Liquids have the ability to change shape.
Liquids flow, even with some resistance.
Liquids have definite volume
Liquids have molecules that slip past each other.

Explanation;

Liquids are one of the three states of matter, others being solids and gases.
Liquids are characterized by particles that are apart as compared to solid particles which are very closely packed, however they are still in contact unlike the case of gaseous particles.
Liquids have a definite volume but an indefinite shape, thus they occupy the volume of the container they are put.
Additionally, they are capable of flowing and take any shape. This is due to the presence of inter-molecular forces which allow the molecules to slide past each other freely.

answer:

liquids have he ability to change shape

liquids flow even with some resistance

liquids have a definite volume

liquids have molecules that slip past each other

Nicole throws a ball at 25 m/s at an angle of 60 degrees abound the horizontal. What is the range of the ball?

Answers

Answer:

the range or the ball is 48.81 m

Explanation:

given;

Nicole throws a ball at 25 m/s at an angle of 60 degrees abound the horizontal.

find:

What is the range of the ball?

solution:

let Ф = 25°

Vo = 25 m/s

consider x-motion using time of fight: x = Vox * t

where x = R = range

t = 2 Voy

R = Vo² sin (2Ф)

plugin values into the formula:

R = (25)² sin (2*25)

9.81

R = 48.81 m

therefore, the range or the ball is 48.81 m

4.8miliseconds broooo.

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Extra info related to the question :-

What is a rationlising factor ?

If the product of two irrational numbers is a rational number then each of the the two is rationalising factor of the other.

What is the purpose of rationilising the denominator ?

If the denominator of a fraction is irrational it is somewhat difficult to locate the fraction on number line. So, to make it easy we need to rationalise the denominator.

How to rationalise the denominator ?

1) Consider the denominator of the fraction.

2) Then multiply the numerator and denominator with rationalising factor of the denominator.

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