Can someone please do these 4 problems for me and show all work.?

Question

1) A force of 60 N is applied to a 4 kg mass at rest for 15 sec.
A) What is the acceleration of the object?
B) What is the Speed of the object at the end of the 15 seconds?

2) A 50 kg object is on a horizontal surface that has a µ = 0.25 and is traveling at a constant velocity.
A) What is the weight of the object?
B) What is the normal force acting on the object?
C) What is the force of friction acting on the object?
D) What is the net force on the object?

3) A 350 kg crate is pulled across the floor by a rope. The force on the rope is 500N. The crate is moving at a constant velocity of 2.5 m/s.
A) What is the force of friction acting on the object?
B) What is the weight of the object?
C) What is the coefficient of frictions (µ) between the crate and the floor?

4) A bullet is fired horizontally from a window 30m above the ground at 250 m/s.
A) How long will the bullet take to reach the ground?
B) How far does the buller travel horizontally before it hits the ground?

Answer 1

1) F=ma
60N=(4kg)a
a=15m/s^2

b) V=at+vi
V=(15m/s^2)(15s)
V=225m/s


2)a) w=mg=(50kg)(9.8)=490N
b) 490N
c)Friction=mu(Fnormal)
Friction=0.25(490N)
Friction=122.5N
d) The Fnet is 0N because the object is going at a constant speed.


3)a) Friction=500N, why? the crate is going at a constant speed.
b) w=mg=(350kg)(9.8)=3430N
c) Friction=mu(Fnormal)
500N=mu(3430N)
mu=.145


6)T=sqr(2d/g)
T= sqr(2*30/9.8)
T=2.47s

b) x=vt
x=(250m/s)(2.47s)
x=618.5m

Answer 2

to function or subtract fractions, you will possibly desire to locate a worry-unfastened denominator. consequently, of direction the denominator is 4. you're able to do this a million of two techniques. you could the two replace 8 a million/4 right into a blended huge form, which will grow to be 33/4, and 15 (that's technically 15/a million) will grow to be 60/4. Subtract the two with the worry-unfastened denominator. 60/4 - 33/4 = 27/4, that's additionally written as 6 3/4. it is style of the good way even with the indisputable fact that. A shorter way could be to alter 15 into 14 4/4. Now you have 14 4/4 - 8 a million/4. 14 - 8 = 6 and four/4 - a million/4 = 3/4. for this reason, the respond is 6 3/4.

Answer 3

wow thats a lot!

well anyway. here
remember : physics is just pluggin values into its correspondents

1 a) force is mass x acceleration, so just plug them all and solve.
b) speed is change in velocity divided by the time..

2 a) weight is mass times gravity (gravity =9.8m/s^2)
b) normal force is equal to weight
c) fs = mu / Fn (normal force) i gues.
d) f =wg (not sure, i forgot this)

ok.. i gues thats enough. .try to do some research on that. u can see alot on the iternet. =) that helped me alot. ok.. so.. just take time to read and ul understand it. (betta than discussions? ) ahhaha jk! try to solve the last 2 probs. those r easy ones if u hav ur notes. i already gave u two samples. hahaha. lol. goodluck! =)

Answer 4

No. You should do your own homework. It is good for you.

Answer 5

No, that is cheating, you have to study.

Answer 6

thanks for the brain teaser. i'll show my work when you show yours!!! homework is good for YOU!!!!