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777dan777 [17]
2 years ago
12

A ball is thrown horizontally from the top of

Physics
1 answer:
nordsb [41]2 years ago
7 0

Answer:

54.0 m/s

Explanation:

We can start by calculating the time it takes for the ball to reach the ground. This can be done by using the equation for the vertical position of the ball at time t:

y(t) = h + u_y t - \frac{1}{2}gt^2

where

h = 140 m is the initial height

u_y =0 is the initial vertical velocity (the ball is thrown horizontally)

g = 9.8 m/s^2 is the acceleration of gravity

When the ball reaches the ground, y=0, so we solve for t to find the time of flight:

0=h-\frac{1}{2}gt^2\\t=\sqrt{\frac{2h}{g}}=\sqrt{\frac{2(140)}{9.8}}=5.35 s

We can find the vertical speed of the ball at the moment of the impact by using

v_y=u_y+gt

Using t = 5.35 s,

v_y=0+(9.8)(5.35)=52.4 m/s

The motion of the ball along the horizontal direction is a uniform motion - so the horizontal velocity is constant during the whole motion, and it is given by

v_x = \frac{d}{t}

where

d = 69 m

is the distance travelled horizontally. Using t = 5.35 s,

v_x = \frac{69}{5.35}=12.9 m/s

And therefore, the speed of the ball at the moment of the impact is given by

v=\sqrt{v_x^2+v_y^2}=\sqrt{(12.9)^2+(52.4)^2}=54.0 m/s

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Answer:

Same reading.

Explanation:

Assume that after the string breaks the ball falls through the liquid with constant speed. If the mass of the bucket and the liquid is 1.20 kg, and the mass of the ball is 0.150 kg,

A.) Before the string break, the total weight = weight of the can + weight of the water.

According to Archimedes' Principle which state that: “A body immersed in a liquid loses weight by an amount equal to the weight of the liquid displaced.” Archimedes principle also states that: “When a body is immersed in a liquid, an upward thrust, equal to the weight of the liquid displaced, acts on it

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3 years ago
Suppose that a simple pendulum consists of a small 60.0 g bob at the end of a cord of negligible mass. If the angle 0 between th
erik [133]

Based on the mass of the bob and the angle between the cord and the vertical, the pendulum length is 0.50m.

The maximum kinetic energy can be found to be 9.42 x 10⁻⁴J.

<h3>What is the pendulum length?</h3>

This can be found as:

= g-force / w²

Solving gives:

= 9.8 / 4.43²

= 0.4998 m

= 0.50 m

<h3>What is the maximum kinetic energy?</h3>

This can be found as:

= 0.5 × m × w² × A²

Maximum kinetic energy is:

= 0.5 × 60 × 10⁻³ × (4.43 × 0.4998 x 0.08 rad)²

= 9.42 x 10⁻⁴J

Find out more on maximum kinetic energy at brainly.com/question/24690095.

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1 year ago
How to calculate kinetic energy given mass and velocity
sashaice [31]

In classical mechanics, kinetic energy (KE) is equal to half of an object's mass (1/2*m) multiplied by the velocity squared. For example, if a an object with a mass of 10 kg (m = 10 kg) is moving at a velocity of 5 meters per second (v = 5 m/s), the kinetic energy is equal to 125 Joules, or (1/2 * 10 kg) * 5 m/s2.

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How are heat and light waves produced on and in the sun?
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4. How long would it take for a water balloon to fall 39 m if we dropped it starting from rest down an
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Answer:

Around 2.8212 sec

Explanation:

Given the eqn x=1/2at^2+vot

your vo=0

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=7.95=t^2

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