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3 years ago

A projectile is fired with initial speed vo at an angle of 45o above the horizontal. Assume no air resistance.

Physics

1 answer:

katrin2010 [14]3 years ago

7 0

Answer:

The correct answer is a

Explanation:

At projectile launch speeds are

X axis vₓ = v₀ = cte

Y axis $v_{y}$ = v_{oy} –gt

The moment is defined as

p = mv

For the x axis

pₓ = mvₓ = m v₀ₓ

As the speed is constant the moment is constant

For the y axis

p_{y} = m v_{y} = m (v_{oy} –gt) = m v_{oy} - m (gt)

Speed changes over time, so the moment also changes over time

Let's examine the answer

i True

ii False. The moment changes with time

The correct answer is a

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On a distance-time graph, time is shown on the y-axis.<br> A) True<br> B) False

Artist 52 [7]

Answer:

false : In distance time graph,time is shown on the x -axis

7 0

2 years ago

To what temperature will a 79.0 g piece of glass raise if it absorbs 9457 calories of heat and its specific heat capacity is 0.5

ruslelena [56]

Answer:

T_final = 279.4 [°C]

Explanation:

In order to solve this problem, we must use the following equation of thermal energy.

$Q=m*C_{p}*(T_{f}-T_{i})$

where:

Q = heat = 9457 [cal]

m = mass = 79 [g] = 0.079 [kg]

Cp = specific heat = 0.5 [cal/g*°C]

T_initial = initial temperature = 40 [°C]

T_final = final temperature [°C]

$9457 = 79*0.5*(T_{f}-40)\\239.41=T_{f}-40\\\\T_{f}=279.4[C]$

8 0

3 years ago

The world’s supply of fossil fuels will _____.

Mekhanik [1.2K]

The world’s supply of fossil fuels will dwindle slowly until a replacement source is found that provides the same power.

bc some day we will actually run out of it and find sth that gives power

3 0

3 years ago

Read 2 more answers

Two acrobats flying through the air grab and hold onto each other in midair as part of a circus act.One acrobat has a mass of 60

earnstyle [38]

Answer:

1.36m/s

Explanation:

We are given that

Mass of one acrobat, $m_1=60 kg$

Mass of another acrobat, $m_2=50 kg$

$v_2=-3 m/s$

$v_1=5 m/s$

We have to find their velocity immediately after they grab onto each other.

The collision between two acrobat is inelastic

According to law of conservation of momentum

$m_1v_1+m_2v_2=(m_1+m_2)V$

Substitute the values

$60\times 5+50(-3)=(60+50)V$

$300-150=110V$

$V=\frac{300-150}{110}=1.36m/s$

4 0

2 years ago

A block suspended from a spring is oscillating vertically with a frequency of 4 Hz and an amplitude of 7 cm. A very small rock i

Gekata [30.6K]

Answer:

v = - 1,715 m / s , x = 0.0156 m

Explanation:

This is an oscillatory movement exercise, which is described by the expression

x = A cos (wt + Ф)

we can assume that the block is released from its maximum elongation, so the phase constant (Ф) is zero

As we are told that the stone does not affect the movement of the spring mass system, the amplitude and angular velocity do not change, in the upward movement the stone is attached to the mass, but in the downward movement the mass has an acceleration greater than g leave the stone behind, let's look for time, for this we use the definition of speed and acceleration

v = dx / dt

v = - A w sin wt

a = - Aw² cos wt

a = -g

-g = - Aw² cos wt

wt = cos⁻¹ (g / Aw²)

t = 1 / w cos⁻¹ (g / Aw²)

angular velocity and frequency are related

w = 2π f

w = 2π 4

w = 8π rad / s

remember that the angles are in radians

t = 1 / 8π cos⁻¹ (9.8 / (0.07 64π²))

t = 0.039789 1.3473

t = 0.0536 s

let's find the speed for this time

v = - A w sin wt

v = - 0.07 8π sin (8π 0.0536)

v = - 1,715 m / s

the distance is

x = A cos wt

x = 0.07 cos (8π 0.0536)

x = 0.0156 m

4 0

3 years ago