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3 years ago

An 80 kg hunter gets a rope around a 400 kg

1 answer:

6 0

Im thinking the polar bear will not move, because of the huge mass differences. Instead, the hunter will experience his feet sliding out from under him.

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A car travels at a steady 40.0 m/s around a horizontal curve of radius 200 m. What is the minimumcoefficient of static friction

zhenek [66]

Answer:

c. 0.816

Explanation:

Let the mass of car be 'm' and coefficient of static friction be 'μ'.

Given:

Speed of the car (v) = 40.0 m/s

Radius of the curve (R) = 200 m

As the car is making a circular turn, the force acting on it is centripetal force which is given as:

Centripetal force is, $F_c=\frac{mv^2}{R}$

The frictional force is given as:

Friction = Normal force × Coefficient of static friction

$f=\mu N$

As there is no vertical motion, therefore, $N=mg$ . So,

$f=\mu mg$

Now, the centripetal force is provided by the frictional force. Therefore,

Frictional force = Centripetal force

$f=F_c\\\\\mu mg=\frac{mv^2}{R}\\\\\mu=\frac{v^2}{Rg}$

Plug in the given values and solve for 'μ'. This gives,

$\mu = \frac{(40\ m/s)^2}{200\ m\times 9.8\ m/s^2}\\\\\mu=\frac{1600\ m^2/s^2}{1960\ m^2/s^2}\\\\\mu=0.816$

Therefore, option (c) is correct.

7 0

3 years ago

Which type of radiation can reach the furthest? A. Beta B. Gamma C. Alpha

Mashutka [201]

Answer:

C. Alpha

Explanation:

Gamma radiation, unlike alpha or beta, does not consist of any particles, instead consisting of a photon of energy being emitted from an unstable nucleus. Having no mass or charge, gamma radiation can travel much farther through air than alpha or beta, losing (on average) half its energy for every 500 feet.

7 0

3 years ago

Read 2 more answers

Describe what a high and low frequency electromagnetic wave look like:

Ghella [55]

A high electromagnetic wave has short, very fast, frequent waves.

a low electromagnetic wave has long, very slow, infrequent waves.

hope this helps! pls mark brainliest!

4 0

3 years ago

A boat is heading across a river at a velocity of 25 mph. The river is flowing downstream at 10 mph. What is the actual velocity

AnnyKZ [126]

Principle: Pythagorean theorem

Given:
Let a = boat velocity = 25 miles per hour
b = river velocity = 10 miles per hour

Required: c = actual velocity

Solution:

c^2 = a^2 + b^2
c^2 = (25)^2 + (10)^2
c^2 = 725
(c^2)^0.5 = (725)^0.5
c = 26.93 miles per hour

ANSWER: Actual boat velocity is 26.93 miles per hour

8 0

3 years ago

What is the wavelength of a sound wave with a frequency of 50hz (speed of sound is 342 m/s?

marysya [2.9K]

6.84m

Explanation:

According to this formula

speed of wave=wavelength×frequency

you have

wavelength=speedfrequency=342 ms−150s−1=6.84 m

7 0

3 years ago