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STatiana [176]
3 years ago
11

A 3-kg mass is in free fall. What is the velocity of the mass after 7 seconds??

Physics
2 answers:
bekas [8.4K]3 years ago
7 0
68.6m/s in the answer
Lisa [10]3 years ago
3 0
68.6m/s is the answer <span />
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Two identical cars, one on the moon and one on the earth, have the same speed and are rounding banked turns that have the same r
Naily [24]

Answer:

The value of the centripetal forces are same.

Explanation:

Given:

The masses of the cars are same. The radii of the banked paths are same. The weight of an object on the moon is about one sixth of its weight on earth.

The expression for centripetal force is given by,

F_{c} = \dfrac{mv^{2}}{r}

where, m is the mass of the object, v is the velocity of the object and r is the radius of the path.

The value of the centripetal force depends on the mass of the object, not on its weight.

As both on moon and earth the velocity of the cars and the radii of the paths are same, so the centripetal forces are the same.

3 0
3 years ago
The muzzle velocity of a rifle bullet is 709 m s−1along the direction of motion. If the bullet weighs 35 g, and the uncertainty
nydimaria [60]

Answer:

Uncertainty in position of the bullet is \Delta x=1.07\times 10^{-33}\ m

Explanation:

It is given that,

Mass of the bullet, m = 35 g = 0.035 kg

Velocity of bullet, v = 709 m/s

The uncertainty in momentum is 0.20%. The momentum of the bullet is given by :

p=mv

p=0.035\times 709=24.81\ kg-m/s

Uncertainty in momentum is,

\Delta p=0.2\%\ of\ 24.81

\Delta p=0.049

We need to find the uncertainty in position. It can be calculated using Heisenberg uncertainty principal as :

\Delta p.\Delta x\geq \dfrac{h}{4\pi}

\Delta x=\dfrac{h}{4\pi \Delta p}

\Delta x=\dfrac{6.62\times 10^{-34}}{4\pi \times 0.049}

\Delta x=1.07\times 10^{-33}\ m

Hence, this is the required solution.

7 0
3 years ago
The current theory of the structure of the
myrzilka [38]

Answer:

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Explanation:

4 0
3 years ago
The location of the strongest magnetic force is the
Elenna [48]

Answer:

The north pole has the strongest magnetic force

6 0
3 years ago
Using Newton’s second law, why do you think a cotton ball may not be used as a baseball in a baseball game.
stich3 [128]

Answer:

as its mass and velocity will less so its momentum will be less than that of baseball

3 0
3 years ago
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