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Eduardwww [97]
3 years ago
6

A pitcher throws a baseball at 45 m/s. The baseball has a mass of 400 grams. Disregarding air resistance, the baseball's momentu

m when it hits the catcher's mitt is a0 kg*m/s.
Physics
1 answer:
MatroZZZ [7]3 years ago
7 0
Momentum = (mass) x (speed)

= (0.4 kg) x (45 m/s)

=   18 kg-m/s in the direction from the mound to the plate.
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A copper wire is stretched so that its length increases and its diameter decreases. what is the result?
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The result is although the wire's resistivity doesn't change, its resistance does.

Considering the formula for a material's resistance:

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R is directly proportional to L and inversely proportional to A, as can be seen. Be aware that "rho" is a material-specific and intensive attribute (meaning this value will not change if the material is only physically altered). Remember that A = This implies that the relationship between R and the square of r is inverse. When the wire is stretched, the impacts on length are less noticeable than the effects on r. Therefore the wire's resistance increases, but its resistivity stays the same.

Learn more about resistance here:

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If the San Andreas Fault moves 200 cm (2 meters) per big earthquake, and plate movement is xx cm/yr (see question above), how ma
weqwewe [10]

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Option C

80 years

Explanation:

<em>From Scientific records, the rate of movement of the plate is 0.025 meters</em>

Since the fault moves at the rate of 2 meters per year, to obtain the number of years it will takes to produce an earth quake, we will have to divide the rate of movement of the fault by the rate of movement of the plate.

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5 0
4 years ago
A person Drove from 8am Tuesday to 5pm Wednesday. Total drive 396 miles. He have lunch for 30 min on Tuesday and sleep overnight
r-ruslan [8.4K]

Answer:

average speed = 18 miles / hour

Explanation:

Given data

drive = 396 miles

time = 8 am Tuesday to 5 pm Wednesday = 33 hours

lunch = 30 min Tuesday  + 30 min Wednesday = 60 min = 1 hour

sleep = 7 pm Tuesday to  5 am Wednesday = 10 hours

to find out

average speed

solution

we know that he take total time = 33 hours and he took rest + luch = ( 1 + 10 hours)

so total travel time is = 33 - 11 = 22 hours

so

average speed = distance / time

average speed = 396 / 22

average speed = 18 miles / hour

6 0
3 years ago
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