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3 years ago

3. is the force on a dropped ball. gravity acceleration

Physics

1 answer:

Oduvanchick [21]3 years ago

5 0

Answer:

Speeding up While Falling Down

Gravity is a force that pulls objects down toward the ground. When objects fall to the ground, gravity causes them to accelerate. Acceleration is a change in velocity, and velocity, in turn, is a measure of the speed and direction of motion.

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Explanation:

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20. A cannon shoots a ball at 38 m/s at an angle of 30°. Ignore the original height of the cannon and assume level ground.

sergij07 [2.7K]

Answer:
a.3.87s
b.127.36m
c.18.4m

Step by step explanation:
Refer to the diagram

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3 years ago

A regulation basketball has a 32 cm diameter

Rudik [331]

Answer:

1.8 s

Explanation:

Potential energy = kinetic energy + rotational energy

mgh = ½ mv² + ½ Iω²

For a thin spherical shell, I = ⅔ mr².

mgh = ½ mv² + ½ (⅔ mr²) ω²

mgh = ½ mv² + ⅓ mr²ω²

For rolling without slipping, v = ωr.

mgh = ½ mv² + ⅓ mv²

mgh = ⅚ mv²

gh = ⅚ v²

v = √(1.2gh)

v = √(1.2 × 9.81 m/s² × 4.8 m sin 39.4°)

v = 5.47 m/s

The acceleration down the incline is constant, so given:

Δx = 4.8 m

v₀ = 0 m/s

v = 5.47 m/s

Find: t

Δx = ½ (v + v₀) t

t = 2Δx / (v + v₀)

t = 2 (4.8 m) / (5.47 m/s + 0 m/s)

t = 1.76 s

Rounding to two significant figures, it takes 1.8 seconds.

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3 years ago

what does it mean to make “difficult choices” when creating a federal budget? A) deciding how to keep interest rates on the nati

Lilit [14]

the answer is D, deciding what will be funded and what will be cut.

8 0

3 years ago

Read 2 more answers

The quantity of charge passing through a surface of area 1.82 cm2 varies with time as q = q1 t 3 + q2 t + q3 , where q1 = 5.2 C/

Brrunno [24]

Answer:

Current through the surface at t = 1.1 s is 21.37 A.

Explanation:

The charge is passing through a surface of area varies with time as :

$q=q_1t^3+q_2t+q_3$

Here,

$q_1=5.2\ C/s^3\\\\q_2=2.5\ C/s\\\\q_3=6.5\ C$

t is in seconds

$q=5.2t^3+2.5t+6.5$

The rate of change of electric charge is called electric current. It is given by :

$I=\dfrac{dq}{dt}\\\\I=\dfrac{d(5.2t^3+2.5t+6.5)}{dt}\\\\I=15.6t^2+2.5$

At t = 1.1 s, Current,

$I=15.6(1.1)^2+2.5\\\\I=21.37\ A$

So, the instantaneous current through the surface at t = 1.1 s is 21.37 A.

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3 years ago

A person walks out of a store with a pillow at the top of an overflowing shopping cart. While walking to the car, the cart's whe

Mashutka [201]

The pillow will continue to go forward as Newton's first law states that an object will continue in it's path unless another force acts upon it

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3 years ago