(forces and motion) in 2-3 sentences explain why velocity (or speed) is interesting

1 answer:

6 0

‘velocity’ refers to how fast an object is moving ‘in a particular direction’. speed is only how fast something is moving and velocity is how fast something is moving AND the direction. (hope this helps)

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An unnamed professor is walking to class when an office chair (travelling in the same direction) collides with them. The profess

ololo11 [35]

Answer: 1.96 m/s

Explanation:

Given

Mass of Professor $m_1=113\ kg$

Velocity of professor $u_1=1.56\ m/s$

mass of chair $m_2=10\ kg$

velocity of chair $u_2=6.5\ m/s$

Suppose after the collision, v is the common velocity

Conserving momentum

$\Rightarrow m_1u_1+m_2u_2=(m_1+m_2)v\\\\\Rightarrow v=\dfrac{113\times 1.56+10\times 6.5}{113+10}=\dfrac{241.28}{123}\\\\\Rightarrow v=1.96\ m/s$

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A person is in a car crash and is not wearing their seatbelt. They hit their

Greeley [361]

He still move deforce stopping this call law of inertia depend on the mass of object

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3 years ago

An explosive projectile is launched straight upward to a maximum height h. At its peak, it explodes, scattering particles in all

Varvara68 [4.7K]

Answer:

θ = tan⁻¹ ( $\frac{19.6 \ h}{v}$ )

Explanation:

This problem must be solved using projectile launch ratios. Let's analyze the situation, the projectile explodes at the highest point, therefore we fear the height (i = h), the speed at this point is the same, but the direction changes, we are asked to find the smallest angle of the speed in the point of arrival with respect to the x-axis.

The speed at the arrival point (y = 0)

v² = vₓ² + v_y²

Let's see how this angle changes, for two extreme values:

* The particle that falls from the point of explosion, in this case the speed is vertical

v = v_y

the angle with the horizontal is 90º

* The particle leaves horizontally from the point of the explosion, the initial velocity is horizontal

vₓ = v

the final velocity for y = 0

v_f = vₓ² + v_y²

therefore the angle has a value greater than zero and less than 90º

As they ask for the smallest angle, we can see that we must solve the last case