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3 years ago

Please help on this one someone?

Physics

1 answer:

vaieri [72.5K]3 years ago

8 0

Initially, the energy is used to overcome the attractions between the molecules. At this point the temperature of the sample does not increase. When the attractions have been overcome the energy then becomes kinetic energy of the molecules, increasing temperature

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A ball of mass m= 450.0 g traveling at a speed of 8.00 m/s impacts a vertical wall at an angle of θi =45.00 below the horizontal

Mkey [24]

Answer:

F = 20.4 i ^

Explanation:

This exercise can be solved using the ratio of momentum and amount of movement.

I = F t = Dp

Since force and amount of movement are vector quantities, each axis must be worked separately.

X axis

Let's look for speed

cos 45 = vₓ / v

vₓ = v cos 45

vₓ = 8 cos 45

vₓ = 5,657 m / s

We write the moment

Before the crash p₀ = m vₓ

After the shock $p_{f}$ = -m vₓ

The variation of the moment Δp = mvₓ - (-mvₓ) = 2 m vₓ

The impulse on the x axis Fₓ t = Δp

Fₓ = 2 m vₓ / t

Fx = 2 0.450 5.657 / 0.250

Fx = 20.4 N

We perform the same calculation on the y axis

sin 45 = vy / v

vy = v sin 45

vy = 8 sin 45

vy = 5,657 m / s

We calculate the initial momentum po = m $v_{y}$

Final moment $p_{f}$ = m $v_{y}$

Variations moment Δp = m $v_{y}$ - m $v_{y}$ = 0

Force in the Y-axis $F_{y}$ = 0

Therefore the total force is

F = fx i ^ + Fyj ^

F = Fx i ^

F = 20.4 i ^

3 0

4 years ago

In a parachute, falling steadily at 7.5m/s, how long does it take to reach the ground from 3,000 m high?

photoshop1234 [79]

Answer:

25 minutes

Explanation:

4 0

3 years ago

Pretend you (80 kg) are making repairs on the outside of the International Space Station. You are floating 20 meters away from t

djyliett [7]

Answer:

32 seconds

Explanation:

m1 = 80 kg

m2 = 10 kg

v2 = 5m/s

According to the property of conservation of momentum, assuming that both you and the bag are stationary before the safety rope comes lose:

$m_{1} v_{1} =m_{2} v_{2} \\80v_{1} =10*5 \\v_{1} = 0.625\ m/s$

Since the space station is 20 meters away, the time taken to reach it is given by:

$t = \frac{20}{0.625}\\t=32\ s$

It takes you 32 seconds to reach the station.

7 0

3 years ago

Select all of the following that equal an impulse of 10 units A).Force = 20, time = 1/2

NNADVOKAT [17]

Answer:

A, C and D

Explanation:

The impulse is defined as the product between the force (F) and the time of the collision (t):

$I=Ft$

Let's apply the formula to calculate the impulse for each situation:

A) $I=Ft=(20)(\frac{1}{2})=10$

B) $I=Ft=(3)(4)=12$

C) $I=Ft=(5)(2)=10$

D) $I=Ft=(10)(1)=10$

We see that the situations in which the impulse is equal to 10 units are:

A, C and D

4 0

3 years ago

The de Broglie wavelength of a 0.064-kg golf ball is 3.09 x 10^−34m. What is its speed? (h = 6.63 x 10^−34 J⋅s)

tatyana61 [14]

Answer:

The speed is 33.5 m/s.

Explanation:

Given that,

Mass = 0.064 kg

Wavelength $\lambda= 3.09\times10^{-34}\ m$

We need to calculate the speed

Using formula of he de Broglie wavelength

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

$v=\dfrac{h}{m\lambda}$

Where, h = Planck constant

m = mass

$\lambda$ = wavelength

Put the value into the formula

$v = \dfrac{6.63\times10^{-34}}{0.064\times 3.09\times10^{-34}}$

$v=33.5\ m/s$

Hence, The speed is 33.5 m/s.

3 0

3 years ago