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dezoksy [38]
3 years ago
8

During a baseball game a pitcher threw a baseball, and the catcher, who was behind home plate, caught it. Which is true about th

e pitcher when the catcher caught the ball?
A) He saw the catcher catch the ball first.
B) He heard and saw the ball at the same time.
C) He heard the sound of the catcher's mitt first.
D) He saw the catcher catch the ball, but did not hear it.
Physics
2 answers:
andreev551 [17]3 years ago
8 0
In this question letter A)He saw the catcher catch the ball first,  would be true 
Juli2301 [7.4K]3 years ago
6 0

Answer: The answer is A

Explanation:

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You are moving into an apartment and take the elevator to the 6th floor. Suppose your weight is 790 N and that of your belonging
aliina [53]

Answer:

a) W=26600J

b) W=-12008J

Explanation:

Given the information from the exercise we can calculate the work done by the elevator using the following formula:

W=F*s

a) Considering you and your belongings as a system we know that the elevator is applying a Normal reaction force of:

F=790N+960N=1750N

Since the force applied and the displacement is in the same direction, the work done by the elevator is positive

W=(1750N)(15.2m)=26600J

b) The reaction force applied by the elevator is the same as the weight of the person

F=790N

Since the force applied and the displacement is in opposite direction, the work done by the elevator is negative

W=-(790N)(15.2m)=-12008J

7 0
3 years ago
In a collision, a 15 kg object moving with a velocity of 3 m/s transfers some of its momentum to a 5 kg object. What would be th
Misha Larkins [42]

The key to solve this problem is the conservation of momentum. The momentum of an object is defined as the product between the mass and the velocity, and it's usually labelled with the letter p:

p=mv

The total momentum is the sum of the momentums. The initial situation is the following:

m_A=15,\quad v_A=3,\quad m_B=5,\quad v_B=0

(it's not written explicitly, but I assume that the 5-kg object is still at the beginning).

So, at the beginning, the total momentum is

p=m_Av_A+m_Bv_B=15\cdot 3+5\cdot 0=45

At the end, we have

m_A=15,\quad v_A=1,\quad m_B=5,\quad v_B=x

(the mass obviously don't change, the new velocity of the 15-kg object is 1, and the velocity of the 5-kg object is unkown)

After the impact, the total momentum is

p=m_Av_A+m_Bv_B=15\cdot 1+5\cdot x=15+5x

Since the momentum is preserved, the initial and final momentum must be the same. Set an equation between the initial and final momentum and solve it for x, and you'll have the final velocity of the 5-kg object.

4 0
3 years ago
A horizontal force of 30N is applied to a mass of 10 kg causing it to accelerate. If the coefficient of friction is 0.20 what is
Blizzard [7]

♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️

The force of friction is equal to the product of the vertical force applied by the surface to the object in the coefficient of friction.

♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️

In this question ,

surface vertical force = Weight of the object

Thus ;

svf = ( mass ) × ( gravity acceleration )

_________________________________

If gravity acceleration is 10 :

svf = 10 × 10 = 100 N

So ;

frictional force = 100 × 0.20

frictional force = 20 N

##############################

If gravity acceleration is 9.8 :

svf = 10 × 9.8 = 98 N

So ;

frictional force = 98 × 0.20

frictional force = 19.6 N

_________________________________

♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️♥️

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2 years ago
All objects emit what radiation
Eduardwww [97]
If an object is not at Absolute Zero, then it is
absorbing and radiating thermal (heat) energy.
5 0
2 years ago
Why can a star have several different habitable zones
Rzqust [24]

Because they are placed in different habitable zones

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