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Zigmanuir
3 months ago
8

A father demonstrates projectile motion to his children by placing a pea on his fork's handle and rapidly depressing the curved

tines, launching the pea to heights above the dining room table. Suppose the pea is launched at 7.39 m/s at an angle of 69.0° above the table. With what speed (in m/s) does the pea strike the ceiling 1.90 m above the table?
Physics
1 answer:
inna [3.1K]3 months ago
5 0

Answer:

4.17 m/s

Explanation:

To approach this problem, we start by examining the vertical movement of the pea.

The initial vertical speed of the pea is

u_y = u sin \theta = (7.39)(sin 69.0^{\circ})=6.90 m/s

We can solve the problem using the suvat equation:

v_y^2-u_y^2=2as

where

v_y is the vertical speed when the pea impacts the ceiling

a=g=-9.8 m/s^2 is the acceleration due to gravity

s = 1.90 is the distance from the ceiling

Finding v_y,

v_y = \sqrt{u_y^2+2as}=\sqrt{(6.90)^2+2(-9.8)(1.90)}=3.22 m/s

The horizontal speed stays constant throughout the motion and is defined by

v_x = u cos \theta = (7.39)(cos 69.0^{\circ})=2.65 m/s

Consequently, the speed of the pea upon reaching the ceiling is

v=\sqrt{v_x^2+v_y^2}=\sqrt{2.65^2+3.22^2}=4.17 m/s

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2 months ago
A shuttle on Earth has a mass of 4.5 E 5 kg. Compare its weight on Earth to its weight while in orbit at a height of 6.3 E 5 met
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Response:

83%

Clarification:

At the surface, the weight can be expressed as:

W = GMm / R²

where G denotes the gravitational constant, M represents the Earth's mass, m signifies the shuttle's mass, and R is the Earth's radius.

When in orbit, the weight is given by:

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