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Rama09 [41]
3 years ago
15

Assertion(A):The distance moved by an object in unit time is called its speed. Reason (R):Faster vehicles have higher speeds. i)

A is correct while R is incorrect. ii) R is correct while A is incorrect. iii) Both A and R are correct iv) Both A and R are incorrect.
Physics
1 answer:
ikadub [295]3 years ago
8 0

Answer:

it's ii) R is correct while A is incorrect

Explanation:

cuz, both statements are correct but the reason is not the correct reason for the assertion,

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Question 19 of 20
Vlad [161]

Answer:

D. You would weigh the same on both planets because their masses

and the distance to their centers of gravity are the same.

Explanation:

The above statement is true due to the fact that, the weight and masses of the individual are same in direct comparison with the distance to their center of gravity.<em> If the weight and masses are not same, then there would have been a significant difference between the two planet.</em>

7 0
3 years ago
a 63 kg object needs to be lifted 7 meters in a matter of 5 seconds. approximately how much horsepower is required to achieve th
Natali [406]
Power is defined as the rate of doing work or the work per unit of time. The first step to solve this problem is by calculating the work which can be determined by the equation:

W = Fd

where:

F = force exerted = ma
d = distance traveled
m = mass of object
a = acceleration

Acceleration is equivalent to the gravitational constant (9.81 m/s^2) if the force exerted has a vertical direction such as lifting.

W = Fd = mad = 63(9.81)(7) = 4326.21 Joules

Now that we have work, we can calculate power.

P = W/t = 4325.21 J / 5 seconds = 865.242 J/s or watts

Convert watts to horsepower (1 hp = 745.7 watts)

P = 865.242 watts (1hp/745.7 watts) = 1.16 hp

3 0
3 years ago
Read 2 more answers
Anissa slides down a playground slide sloped at 25o. The coefficient of kinetic friction between Anissa and the slide is 0.15. I
Keith_Richards [23]

Answer:5.62 m/s

Explanation:

Given

Inclination \theta =25^{\circ}

Coefficient of kinetic Friction \mu _k=0.15

mass of Anissa's m=55 kg

time interval t=2 s

acceleration of the system

a=g\sin \theta -\mu _kg\cos \theta

a=9.8\sin (25)-0.15\cdot 9.8\cos (25)

a=4.14-1.33=2.81 m/s^2

v=u+at

where v=Final Velocity

u=Initial Velocity

a=acceleration of system

t=time

v=0+2.81\times 2

v=5.62 m/s

4 0
3 years ago
A hot air balloon is moving at a speed of 10 meters/second in the +x direction. The balloonist throws a brass ball with a veloci
hoa [83]

Answer:

160 meters

Relative of speed Vr = 10 -2 = 8 m/s    (horizontal speed)

20 sec * 8 m/s = 160 m      since ball travels 20 sec

4 0
3 years ago
If the temperature at the surface of earth (at sea level) is 40°c, what is the temperature at 2000 m if the normal lapse rate is
Viefleur [7K]
6.4*2=12.8 thus, your answer would be 12.8 degrees Celsius. 


8 0
3 years ago
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