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WARRIOR [948]
2 years ago
6

A giant bat has an average mass of 250g. suppose a bat with this mass flies at 2.0m/s when it detects a giant bug

Physics
1 answer:
Anvisha [2.4K]2 years ago
8 0

Question

Determine its kinetic energy

Answer:

0.5 J

Explanation:

Kinetic energy is given by

KE=0.5mv^{2} where m is the mass and v is the speed

Substituting 250g= 0.25 Kg for mass and 2 m/s for v then

KE=0.5\times 0.25\times 2^{2}=0.5 J

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A 0.75 kg rock is projected from the edge of the top of a building with an initial velocity of 11.9 m/s at an angle 59◦ above th
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Answer:

12.76 m.

Explanation:

From the question given above, the following data were obtained:

Initial velocity (u) = 11.9 m/s

Angle of projection (θ) = 59°

Acceleration due to gravity (g) = 9.8 m/s²

Horizontal distance (i.e Range) (R) =?

The horizontal distance other wise known as range from the base of the building to which the rock will strike the ground can be obtained as follow:

R = u²Sine2θ / g

R = 11.9² × Sine (2×59) / 9.8

R = 141.61 × Sine 118 / 9.8

R = 12.76 m

Therefore, the horizontal distance from the base of the building to which the rock will strike the ground is 12.76 m

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Given

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\left |  \vec{R}\right |=\sqrt{a^2+b^2+2ab\cos \theta}

\left |  \vec{R}\right |=\sqrt{5^2+7^2+2\times 5\times 7\cdot \cos 120^{\circ}}\\\left |  \vec{R}\right |=\sqrt{74-35}=\sqrt{39}\\\left |  \vec{R}\right |=6.24\ km

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