Question 6 / 6

A hockey puck slides off the edge of a horizontal platform with an initial velocity of 20 m/s horizontally and experiences no si

stepladder [879]

Answer:

$v_{yf}=6.26m/s$

Explanation:

We have to focus only on the vertical direction: the puck falls 2m with a null vertical initial velocity. We use the equation:

$v_f^2=v_i^2+2ad$

which for the vertical direction is:

$v_{yf}^2=v_{yi}^2+2a_y\Delta y$

or:

$v_{yf}=\sqrt{v_{yi}^2+2a_y\Delta y}$

Taking the downward direction as positive (which means a positive gravitational acceleration and a positive displaceent) we have for our values:

$v_{yf}=\sqrt{(0m/s)^2+2(9.8m/s^2)(2m)}=6.26m/s$

7 0

3 years ago

Bumper car A (281 kg) moving +2.82 m/s makes an elastic collision with bumper car B (209 kg) moving -1.72 m/s. What is the veloc

Nuetrik [128]

The velocity of B after elastic collision is 3.45m/s

This type of collision is an elastic collision and we can use a formula to solve this problem.

<h3>Elastic Collision</h3>

$v_2 = \frac{2m_1u_1}{m_1+m_2} - \frac{m_1 - m_2}{m_1 + m_2}u_2$

The data given are;

m1 = 281kg
u1 = 2.82m/s
m2 = 209kg
u2 = -1.72m/s
v1 = ?

Let's substitute the values into the equation.

$v_1 = \frac{2*281*2.82}{281+209} -\frac{281-209}{281+209}(-1.72)\\v_1 = 3.45m/s$

From the calculation above, the final velocity of the car B after elastic collision is 3.45m/s.

Learn more about elastic collision here;

brainly.com/question/7694106

4 0

2 years ago

Which scientist thought that the atom was the smallest particle in the universe?

Sidana [21]

<span>The scientist thought that the atom was the smallest particle in the universe is John Dalton. The answer is letter B. He established the atomic theory which consists of five; elements are made of extremely small particles called atoms, atoms of different element have different sizes, mass and physic – chemical properties, atoms cannot be divided further, destroyed or created, atoms can combine to form compounds and in chemical reaction, atoms can be combined, separated or rearranged. J.J. Thompson discovered the electrons in the atom. Ernest Rutherford discovered the half – life of an atom and Neils Bohr explain the quantum mechanics.</span>

4 0

3 years ago

Select all the answers that apply. Scientists think past changes in climate have been caused by _____.

Natasha2012 [34]

<span>C. plate tectonics....</span>

8 0

4 years ago

Some bacteria are propelled by biological motors that spin hair-like flagella. A typical bacterial motor turning at a constant a

Anestetic [448]

Answer:

(a) $\omega=1.41*10^3\frac{rad}{s}$