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2 years ago

A 12kg cheetah accelerates 24 m/s". What is the force the cheetah needed to run?

Physics

1 answer:

Kobotan [32]2 years ago

7 0

Answer:

288N

Explanation:

Given parameters:

Mass of Cheetah = 12kg

Acceleration = 24m/s²

Unknown:

Force needed by the cheetah to run = ?

Solution:

The force needed by the Cheetah to run is the net force.

According to Newton's law;

Force = mass x acceleration

Insert the given parameters and solve;

Force = 12 x 24 = 288N

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A cyclist is traveling 10 m/s with an acceleration of 6 m/s2. How fast is the cyclist traveling at the end of 20 seconds

krok68 [10]

Answer:

<em>The cyclist is traveling at 130 m/s</em>

Explanation:

<u>Constant Acceleration Motion </u>

It's a type of motion in which the velocity of an object changes by an equal amount in every equal period of time.

Being a the constant acceleration, vo the initial speed, vf the final speed, and t the time, the following relation applies:

$v_f=v_o+at$

The cyclist initially travels at 10 /s and it's accelerating at a=6m/s^2. We need to know the new speed when t= 20 seconds have passed.

Apply the above equation:

$v_f=10+6\cdot 20$

$v_f=10+120$

$v_f=130\ m/s$

The cyclist is traveling at 130 m/s

7 0

3 years ago

It would take almost 2 years for the fastest human-made spacecraft to travel from earth to europa. about how long would it take

worty [1.4K]

First, we need the distance of Europe and Wolf-359 from Earth.
- The distance of Europe from Earth is: $d_E = 6.28 \cdot 10^8 km$
- The distance of Wolf-359 from Earth is instead 7.795 light years. However, we need to convert this number into km. 1 light year is the distance covered by the light in 1 year. Keeping in mind that the speed of light is $c=3 \cdot 10^8 m/s$ , and that in 1 year there are
365 days x 24 hours x 60 minutes x 60 seconds = $3.154 \cdot 10^7 s/y$ , the distance between Wolf-359 and Earth is
$d_W = 7.995 ly\cdot3\cdot 10^8 m/s \cdot 3.154 \cdot 10^7 s=7.38 \cdot 10^{16}m=7.38 \cdot 10^{13}km$

Now we can calculate the time the spaceship needs to go to Wolf-359, by writing a simple proportion. In fact, we know that the spaceship takes 2 years to cover $d_E$ , so
$2 y:d_E = x:d_W$
from which we find $x$ , the time needed to reach Wolf-359:
$x= \frac{2 y\cdot d_W}{d_E}=2.35 \cdot 10^5 years$

4 0

3 years ago

Why is water sometimes called the universal solvent.

Mrrafil [7]

Answer:

Because it can desolve many many things.

Explanation:

4 0

1 year ago

A dry cleaner throws a 20 kg bag of laundry onto a stationary 8.3 kg cart. the cart and laundry bag begin moving at 2.6 m/s to t

Bond [772]

The total momentum before and after the collision must be conserved.

- Let's start from the end: at this point, both cart and laundry bag are moving together, with a total mass of (m1+m2) and velocity 2.6 m/s. Therefore, the total momentum is
$p_f = (m_1+m_2) v_f =(20 kg+8.3 kg)(2.6 m/s)=73.6 kg \cdot m/s$

- The momentum must be conserved, so the initial momentum must be equal to this value:
$p_i = p_f = 73.6 kg \cdot m/s$

- At the beginning, the cart is stationary, so its momentum is zero. There is only one momentum, the one of the bag, which has a mass of 20 kg and unknwon velocity vi:
$p_i = m_1 v_i$

- So, using the conservation of momentum we find
$m_1 v_i = 73.6 kg \cdot m/s$
and from this, the initial velocity of the laundry bag:
$v_i = \frac{p_f}{m_1}= \frac{73.6 kg \cdot m/s}{20 kg}=3.7 m/s$

3 0

3 years ago

To get an idea of the order of magnitude of inductance, calculate the self-inductance in henries for a solenoid with 1500 loops

valkas [14]

Answer:

The self-inductance in henries for the solenoid is 0.0274 H.

Explanation:

Given;

number of turns, N = 1500 turns

length of the solenoid, L = 13 cm = 0.13 m

radius of the wire, r = 2 cm = 0.02 m

The self-inductance in henries for a solenoid is given by;