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3 years ago

A force of 120 N is applied to an object whose mass is 30 kg. The object's acceleration is:

Physics

1 answer:

Airida [17]3 years ago

8 0

Answer:

C) 4.0 m/s²

Explanation:

Given data

Applied force (F): 120 Newton

Mass of the object (m): 30 kilograms

Acceleration of the object (a): to be determined

We can find the acceleration of the object using Newton's second law of motion.

F = m . a

a = F / m = 120 N / 30 kg = 4.0 m/s²

The acceleration of the object is 4.0 m/s².

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Which wave, the top or bottom, has the larger frequency. explain why.

choli [55]

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3 years ago

A pitcher throws a 0.144-kg baseball toward the batter so that it crosses home plate horizontally and has a speed of 42 m/s just

Solnce55 [7]

(a) 12.8 kg m/s

The impulse delivered by the bat on the baseball is equal to the change in momentum of the baseball:

$I=\Delta p = m(v-u)$

where we have

m = 0.144 kg is the mass of the ball

v = -47 m/s is the final velocity of the ball

u = 42 m/s is the initial velocity of the ball

Substituting into the equation, we find

$I=(0.144 kg)(-47 m/s-(42 m/s))=-12.8 kg m/s$

And since we are interested in the magnitude only,

$I=12.8 kg m/s$

(b) 2.78 kN

The impulse exerted on the ball is also equal to the product between the average force and the contact time:

$I=F\Delta t$

where

F is the average force exerted on the ball

$\Delta t=0.0046 s$ is the contact time

Solving the formula for F, we find

$F=\frac{I}{\Delta t}=\frac{12.8 kg m/s}{0.0046 s}=2783 N = 2.78 kN$

(c) The force exerted on the ball is much larger (1988 times more) than the weigth of the ball

The weight of the ball is given by

$W=mg$

where

m = 0.144 kg is the mass of the ball

g = 9.8 m/s^2 is the acceleration due to gravity

Solving the equation for W, we find

$W=(0.144 kg)(9.8 m/s^2)=1.4 N$

So as we see, the force exerted on the ball (2783 N) is almost 2000 times larger than the weight of the ball (1.4 N):

$\frac{F}{W}=\frac{2783 N}{1.4 N}=1988$

8 0

3 years ago

A researcher measures the thickness of a layer of benzene (nn = 1.50) floating on water by shining monochromatic light onto the

baherus [9]

Answer:

The minimum thickness is $t= 8.75*10^{-8} m$

Explanation:

generally the equation for thin film interference is mathematically represented as

$2nt = (m + \frac{1}{2} ) \lambda$

Where t the thickness

m is any integer

n is the refractive index of the film

$\lambda$ is the wavelength of light

Since we are looking for the thickness we make t the subject of the formula

$t = \frac{(m+ \frac{1}{2} ) \lambda}{2n}$

m= 0 cause the thickness is minimum at m=0

Substituting values

$t = \frac{(0 +\frac{1}{2}) 8525*10^{-9} }{2 *1.5}$

$t= 8.75*10^{-8} m$

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3 years ago

Read 2 more answers

A man pushes a trolley with a horizontal force of 120 N. What is the distance travelled

MatroZZZ [7]

Answer:

b. 3 m

Explanation:

The computation of the distance travelled is shown below:

As we know that

Work done = Horizontal Force × distance travelled

360 J = 120 N × discount travelled

So, the distance travelled is

= 360 J ÷ 120 N

= 3 m

hence, the correct option is b. 3 m

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3 years ago

If there is a doubt on a boundary call in tennis, you should do what?

Ronch [10]

Answer: Each player is responsible for all decisions in her half of the Court. She should be completely honest on all “calls” but, if in doubt, she should give her opponent the benefit of the doubt and play the ball as good. You should not play a let.

Explanation:

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3 years ago