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White raven [17]

4 years ago

7

8. How does inertia act on an object that is moving in a circle? A. It causes the object to speed up as it moves. B. It causes t

he object to move along a straight path. C. It directs the object toward the center of the curve.

2 answers:

valentinak56 [21]4 years ago

7 0

Answer: its D

Explanation:

took on study island

elena-s [515]4 years ago

5 0

I think my answer is C

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A particle (m = 4.3 × 10^-28 kg) starting from rest, experiences an acceleration of 2.4 × 10^7 m/s^2 for 5.0 s. What is its de B

Novay_Z [31]

Answer:

Wavelength, $\lambda=1.28\times 10^{-14}\ m$

Explanation:

Given that,

Mass of the particle, $m=4.3\times 10^{-28}\ kg$

Acceleration of the particle, $a=2.4\times 10^7\ m/s^2$

Time, t = 5 s

It starts from rest, u = 0

The De Broglie wavelength is given by :

$\lambda=\dfrac{h}{mv}$

v = a × t

$\lambda=\dfrac{h}{mat}$

$\lambda=\dfrac{6.67\times 10^{-34}}{4.3\times 10^{-28}\times 2.4\times 10^7\times 5}$

$\lambda=1.28\times 10^{-14}\ m$

Hence, this is the required solution.

4 0

3 years ago

A man walke towards the bus stop 100 meters away at a constant velocity. He reaches the bus stop in 200 seconds. Once at the bus

serg [7]

First:

d = 100 m
t = 200 sec

v = 100/200 = 0.5 m/s

Displacement is zero since he returned to his start point.

t2 = d/v2 = 100/2 = 50 sec

total time = 50 + 200 + 500 = 750 sec

3 0

4 years ago

A 4 kg billiard ball moving on a horizontal surface has a speed of 16 m/s when it strikes a horizontal coiled spring is brought

ruslelena [56]

Answer:

spring constant of the spring is 1820.44 N/m

Explanation:

given data

ball mass = 4 kg

speed = 16 m/s

distance = 0.75 m

to find out

spring constant of the spring

solution

we know that kinetic energy of ball = energy store in spring as compression

so we can express it as

0.5 × m × v² = 0.5 × k × x² ....................1

so put here value we get spring constant k

m × v² = k × x²

4 × 16² = k × 0.75²

solve it we get

k = 1820.44 N/m

so spring constant of the spring is 1820.44 N/m

6 0

4 years ago

Read 2 more answers

Find the speed at which Superman (mass=78.0 kg) must fly into a train (mass = 17863 kg) traveling at 75.0 km/hr to stop it. Runn

lapo4ka [179]

Answer with Explanation:

We are given that

Mass of superman=m=78 kg

Mass of train=m'=17863 kg

Speed of train=u'=75 km/h= $75\times \frac{5}{18}=20.8 m/s$

$1 km/h=\frac{5}{18} m/s$

Let initial speed of superman=u

Momentum=mv

Using the formula

$78u=17863\times 75$

$u=\frac{17863\times 75}{78}$

$u=17175.9 km/h$

Average horizontal force=0.58

Deceleration $a=-0.58\times 9.8=-5.68 m/s^2$

Final speed of train=v'=0

$v=u+at$

Using the formula

$0=20.8-5.68t$

$5.68t=20.8$

$t=\frac{v'-u'}{a}=\frac{0-20.8}{-5.68}$

$t=3.66 s$

$v^2-u^2=2as$

Using the formula

$0-(20.8)^2=2(-5.68)a$

$(20.8)^2=2(5.68)s$

$s={\frac{(20.8)^2}{2(5.68)}=38.1 m$

6 0

3 years ago

Read 2 more answers

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Archy [21]

Answer: i know that ice is denser than water because of the reason why ice is expanding:air. ice has tiny air packets inside that make it bigger than the original state(the state which a substance is at at room temperature.

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4 0

3 years ago