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3 years ago

How far can a person run in 15 minutes if he or she runs at an average speed of 16 km/hr

Physics

1 answer:

Studentka2010 [4]3 years ago

6 0

4 km/hr. There are four quarters in an hour, so just divide 16 by 4 and you get 4. It is directly proportional.

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What is the velocity of a car that travels from mile marker 32 on I-10 to mile marker 312 on I-10 in a time of 2 hours and 45 mi

Dimas [21]

Answer:

101.81818 MPH

Explanation:

8 0

3 years ago

A Block slides down an incline that makes an angle of 30? with the horizontal direction. The coefficient of kinetic friction bet

astraxan [27]

Answer:

Acceleration = 2.35 m/ $s^{2}$

Speed = 8.67 m/s

Explanation:

The coefficient of friction , u =0.3

The angle of incline = 30°

The two forces acting on block are weight and friction.

weight along the incline = mg cos60° = $\frac{mg}{2}$ = 0.5 mg

Friction along incline = umg cos30° = mg $0.3\times \frac{\sqrt{3}}{2}$

Friction along incline = 0.26 mg

Net force acting on the weight = (0.5 - 0.26) mg = 0.24 mg

Acceleration = $\frac{net force}{mass}$ = 0.24 g = 2.35 m/ $s^{2}$

The height of incline = 8 m

Length of the inclined edge = 16 m

$v^{2}=u^{2}+2as$

$v^{2}= 2\times 0.24 \times 9.8\times 16$

v= 8.67 m/s

5 0

4 years ago

How would a coroner take a body's temperature?

SOVA2 [1]

Answer: Rectal Thermometer

Explanation:

The most common way of taking the temperature of the deceased is to use a rectal thermometer or to take a temperature reading from the liver, which can achieve a more realistic core body temperature. Rigor Mortis also acts as a good measuring stick for estimating the time of death.

6 0

4 years ago

A force has direction and contact

dalvyx [7]

Answer:

A force has both magnitude and direction, making it a vector quantity. It is measured in the SI unit of newton (N). Force is represented by the symbol F. The original form of Newton's second law states that the net force acting upon an object is equal to the rate at which its momentum changes with time.

Other units: dyne, pound-force, poundal, kip, kilopond

SI unit: newton (N)

Common symbols: F→, F, F

7 0

3 years ago

The 4.5 cm long second hand on a watch rotates smoothly. What is its angular velocity? What is the speed of the tip of the hand?

Vlada [557]

Angular velocity means how many radians/degrees is this hand passing by every second.
First, you realize it goes through a whole revolution (2 $\pi$ in radians) in 60 seconds.
This means for every second, it passes by:
$\frac{2 \pi }{60 s} = 0.105 \frac{rad}{sec}$

For the next part, you need to know this equation:
Tangential velocity=Angular velocity x radius (meters)
$velocity=0.105 \frac{rad}{sec} *0.045m$
$velocity=0.004725 \frac{meters}{sec}$

5 0

3 years ago