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Len [333]
4 years ago
7

When you drop a ball it accelerates downward at 9.8 m/s2. If you instead throw it downward, then its acceleration immediately af

ter leaving your hand, assuming no air resistance, is
a. 9.8 m/s2.

b. more than 9.8 m/s2.

c. less than 9.8 m/s2.

d. Cannot say, unless the speed of throw is given.​
Physics
1 answer:
damaskus [11]4 years ago
6 0

Answer:

a. 9.8 m/s2.

Explanation:

The acceleration depends on the force of gravity. It's independent of the velocity of the ball.

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A motorcycle of 170 kg is moving with a velocity 25m/ . Calculate the kinetic energy
topjm [15]

Answer: 53125joules

Explanation: The formula for kinetic energy is 1/2mv^2.

So we would have

1/2[(170)(25x25)]=53125

3 0
3 years ago
The drill used by most dentists today is powered by a small air-turbine that can operate at angular speeds of 350000 {\rm rpm} .
damaskus [11]

Answer:

5833.33

Explanation:

\alpha = Angular acceleration

\theta = Number of revolutions

\omega_i = Initial angular speed = 0

t = Time taken = 2 s

Final angular speed

\omega_f=\dfrac{350000}{60}=5833.33\ rps

From the equation of rotational motion we have

\omega_f=\omega_i+\alpha t\\\Rightarrow \alpha=\dfrac{\omega_f-\omega_i}{t}\\\Rightarrow \alpha=\dfrac{5833.33-0}{2}\\\Rightarrow \alpha=2916.665\ rev/s^2

\theta=\omega_it+\dfrac{1}{2}\alpha t^2\\\Rightarrow \theta=0\times t+\dfrac{1}{2}\times 2916.665\times 2^2\\\Rightarrow \theta=5833.33\ rev

The number of revolutions is 5833.33

6 0
3 years ago
which statement tells you where the metalloids are located in the periodic table A.metalloids are the elements to the left of th
IceJOKER [234]
Were is the table at?

5 0
4 years ago
An aluminum rod 17.400 cm long at 20°C is heated to 100°C. What is its new length? Aluminum has a linear expansion coefficient o
NISA [10]

Answer:

the new length is 17.435cm

Explanation:

the new length is 17.435cm

pls give brainliest

3 0
3 years ago
Sally was trying to calculate the speed of the hummingbirds feeding outside her window. Sally measured the distance from one fee
stellarik [79]
Formula to calculate speed:

Speed=Distance/Time

Distance: 24 m
Time: 3 sec

24/3=8

So the correct answer is 8 m/s
7 0
4 years ago
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