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uysha [10]
3 years ago
12

A soccer ball is kicked horizontally. What is the average speed if its distance is 21.0 m after 4.00 s?

Physics
1 answer:
Over [174]3 years ago
5 0
The answer would be 5.25 m/s
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The blade of a lawn mower is rotating at an angular speed of 128 rad/s. The tangential speed of the outer edge of the blade is 3
stiv31 [10]

Answer:

0.25m

Explanation:

Using the expression that relates the angular velocity(w) and the linear velocity (v).

v= wr where;

w is the angular speed= 128rad/s

v is the linear speed = 32m/s

r is the radius

r = v/w

r = 32/128

r = 0.25m

The radius of the blade is 0.25m

4 0
3 years ago
A car’s bumper is designed to withstand a 4.0-km/h (1.1-m/s) collision with an immovable object without damage to the body of th
poizon [28]

Answer:

The force bumper at 0.200m

F=2722.5 N

Explanation:

Using the energy theorem of work

W=K_{f}- K_{i}

W=ΔK

W=F*d

ΔK=\frac{1}{2}*m*v_{f} ^{2} -\frac{1}{2}*m*v_{i} ^{2}

v_{i} =0

ΔK=F*d=\frac{1}{2}*m*v_{f} ^{2} -\frac{1}{2}*m*v_{i} ^{2}

F*d=\frac{1}{2}*m*0 ^{2}- \frac{1}{2}*m*v_{i} ^{2}\\F*d=-\frac{1}{2}*m*v_{i} ^{2}=\frac{1}{2}*900kg*(1.1\frac{m}{s})^{2}\\F*d=544.5\frac{kg*m}{s^{2}}\\ F=\frac{544.5\frac{kg*m}{s^{2}}}{0.2m} \\F=2722.5 N

3 0
3 years ago
How can i stop a headache
Klio2033 [76]

Answer:

Try to Rest.

Have a heating pad on the area where it aches.

Relax.

Or take pain pill and wait for it to settle in.

Explanation:

7 0
4 years ago
Read 2 more answers
Please help: I don't know how to do these problems
antiseptic1488 [7]
d =2.55.68m and t = 11.36s
In my opinion
3 0
3 years ago
If radio waves cannot be reflected from the Sun, how can radar be used to find the distance from Earth to the Sun?
Ksenya-84 [330]

Answer:

Solar surface absorbs the radio waves, it does not reflect the radio waves to earth. So the radar can not be used to measure the distance from earth to the sun. However we can use the Kepler' s third law to measure the planet earth's  distance from the sun.

Explanation:

5 0
4 years ago
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