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4 years ago

The field is 78 meters long. A timer started when the sled started at

Physics

1 answer:

Nezavi [6.7K]4 years ago

5 0

Answer: 4

Explanation: when you're solving velocity you should divide the two numbers so 16/4=4

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In the aerials competition in skiing, the competitors speed down a ramp that slopes sharply upward at the end. The sharp upward

11111nata11111 [884]

Answer:

u = 11.6 m/s

Explanation:

The end of a launch ramp is directed 63° above the horizontal. A skier attains a height of 10.9 m above the end of the ramp.

Maximum height, H = 10.9

Let v is the launch speed of the skier. The maximum height attained by the projectile is given by :

$H=\dfrac{u^2\ sin^2\theta}{g}$

$10.9=\dfrac{u^2\ sin^2(63)}{9.8}$

u = 11.6 m/s

So, the launch speed of the skier is 11.6 m/s. Hence, this is the required solution.

4 0

3 years ago

A clothes dryer uses about 4 amps of current from a 240 volt line. How much power does it use?

Nimfa-mama [501]

Answer: 960 W

Explanation:

Power is the rate at which energy is dispensed. Electrical power can be defined as the rate at which electric energy is flowing in an electric circuit. It is given by the formula:

P = V I

Where, V is the voltage(V) , I is the current (A).

V = 240 V (given)

I = 4 A (given)

P = VI = 960 Watts

Hence, power used by the cloth dryer is 960 W.

6 0

3 years ago

The Sun is approximately 1,400 million kilometers from the planet Saturn, and light from the Sun travels to Saturn at the rate o

irinina [24]

Answer:

Light takes 77 minutes to travel from the Sun to Saturn.

Explanation:

The equation for the average velocity can be used to estimate the time that light will take to travel from the Sun to Saturn. The average velocity is defined as:

$v = \frac{d}{t}$ (1)

Where v is the velocity, d is the covered distance and t is the time.

Equation 1 can be rewritten for t to get:

$t = \frac{d}{v}$

It is necessary to express the speed of light in terms of minutes:

$300000 \frac{Km}{s} . \frac{60 s}{1 min}$ ⇒ $1.8x10^{7}$ <em>Km/min </em>

$t = \frac{1.4x10^{9} Km}{1.8x10^{7} Km/min}$

$t = 77 min$

It is known that light takes 8,3 minutes to go from the Sun to the Earth, where the distance between each other is 150.000.000 Kilometers.

5 0

4 years ago

Equal forces that do not cause a change in an object's motion

ss7ja [257]

Answer:

Balanced forces.

Explanation:

The three main forces that stop moving objects are friction, gravity and wind resistance. Equal forces acting in opposite directions are called balanced forces. Balanced forces acting on an object will not change the object's motion. When you add equal forces in opposite direction, the net force is zero.

6 0

3 years ago

Calcula la densidad del hierro , si 393 g ocupan un volumen de 50 ml

eimsori [14]

Density is mass over volume: d=m/v
d = 393/50 => d = 7.86 g/ml

7 0

3 years ago