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3 years ago

Afootball is kicked at avelocity of 15 m/s at angle of 25 degree to the horizontal. What is the total flight time

Physics

1 answer:

Advocard [28]3 years ago

3 0

Answer:

the total flight time is 1.29 s

Explanation:

The computation of the total flight time is given below:

The initial velocity is 15 m/s = v

And, the angle from horizontal is $\theta = 25\ degrees$

Now the total time is

$t = \frac{2\times v\times \sin \theta }{g} \\\\= \frac{2\times 15\times sin 25^{\circ}}{9.8} \\\\= 1.29 s$

Hence, the total flight time is 1.29 s

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Devon is riding his bicycle at 15 m/s. How far will he travel in 12 s?

Gre4nikov [31]

Devon will travel 180m in 12 seconds. All you have to do is multiply 15 by 12. Hope this helps

6 0

2 years ago

In our first example we will consider a very simple application of Newton’s second law. A worker with spikes on his shoes pulls

sweet-ann [11.9K]

Answer:

Acceleration= $0.5m/s^2$

Speed=0.67 m/s

Explanation:

We are given that

Horizontal force=F=20 N

Mass of box=m=40 kg

We know that

Acceleration= $a=\frac{F}{m}$

Using the formula

Acceleration of box= $\frac{20}{40}=0.5m/s^2$

The acceleration of the box= $0.5m/s^2$

Initial velocity=u=0

Force=F=30 N

Distance=s=0.3 m

$a=\frac{30}{40}=\frac{3}{4} ms^{-2}$

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

Substitute the values

$v^2-0=2\times \frac{3}{4}\times 0.3=0.45$

$v^2=0.45$

$v=\sqrt{0.45}=0.67m/s$

Hence, the speed of the box after it has been pulled a distance of 0.3 m=0.67 m/s

4 0

3 years ago

What did Ernest Rutherford expect to happen when he aimed a beam of particles at a thin gold foil

nikitadnepr [17]

Answer:

he expected a fire to happen I think

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2 years ago

A Carnot air conditioner takes energy from the thermal energy of a room at 70°F and transfers it as heat to the outdoors, which

IrinaK [193]

Answer:

Explanation:

Given that,

Hot temperature

T_H = 96°F

From Fahrenheit to kelvin

°K = (°F - 32) × 5/9 + 273

°K = (96 - 32) × 5/9 + 273

K = 64 × 5/9 + 273 = 35.56 + 273

K = 308.56 K

T_H = 308.56 K

Low temperature

T_L = 70°F

Same procedure to Levine

T_L = (70-32) × 5/9 + 273

T_L = 294.11 K

A carnot refrigerator working between a hot reservoir and at temperature T_H and a cold reservoir and at temperature T_L has a coefficient of performance K given by

K = T_L / (T_H - T_L)

K = 294.11 / (308.56 - 294.11)

K = 294.11 / 14.45

K = 20.36

Then, the coefficient of performance is the energy Q_L drawn from the cold reservoir as heat divided by work done,

So, for each joules W = 1J

K = Q_L / W

Then,

Q_L = K•W

Q_L = 20.36 × 1

Q_L = 20.36 J

Q_L ≈ 20J

So, approximately 20J of heats are removed from the room

4 0

3 years ago

The power produced by an electric motor is 400w.how long will it take the motor to do 10,000 j of work

Lubov Fominskaja [6]

Answer:

Energy = Power × Time

We make Time the subject in this equation

Time = Energy ÷ Power

Time = 10000 ÷ 400

Time = 25seconds

7 0

2 years ago