# OAT physics Ques need help

#### HOPEOPT

##### Full Member
10+ Year Member

Hi every body I struggle solving theses problems in physics, theses questions are found in one of Kaplan practice exams but I could not find the solution:
1. Four point charges are arrangened in a line at the distances shown below. Charges A, B,C,D have magnetitudes of +9, -5C, -12C, respectively. A negative test charge is placed at point C.
A---------25cm-----B--------25cm----C-----25cm-----D.
What is the magnitude of the force acting on the test charge?. (K is Coulomb's constant, Z is the magnitude of the test charge in coulombs).
The answer is 236 kZ newtons
How we solve it?.

2.
A solid weights 60 ibs in air. To determine its density it is immersed in a test liquid of weight-density 10ibs/ft^3. If the solid weight 40 Ibs when immersed inthe liquid, its density is closest to :

how we solve it/.

#### KHE

##### Senior Member
15+ Year Member
Hi every body I struggle solving theses problems in physics, theses questions are found in one of Kaplan practice exams but I could not find the solution:
1. Four point charges are arrangened in a line at the distances shown below. Charges A, B,C,D have magnetitudes of +9, -5C, -12C, respectively. A negative test charge is placed at point C.
A---------25cm-----B--------25cm----C-----25cm-----D.
What is the magnitude of the force acting on the test charge?. (K is Coulomb's constant, Z is the magnitude of the test charge in coulombs).
The answer is 236 kZ newtons
How we solve it?.

2.
A solid weights 60 ibs in air. To determine its density it is immersed in a test liquid of weight-density 10ibs/ft^3. If the solid weight 40 Ibs when immersed inthe liquid, its density is closest to :

how we solve it/.

I was thinking about the questions you pose, and the fact that you and many others on here are taking or will have to take the OAT and I'm left with one thought....

BETTER YOU THAN ME!!!!!!!!!!!

#### sportsdude00

##### Full Member
10+ Year Member
Hi every body I struggle solving theses problems in physics, theses questions are found in one of Kaplan practice exams but I could not find the solution:
1. Four point charges are arrangened in a line at the distances shown below. Charges A, B,C,D have magnetitudes of +9, -5C, -12C, respectively. A negative test charge is placed at point C.
A---------25cm-----B--------25cm----C-----25cm-----D.
What is the magnitude of the force acting on the test charge?. (K is Coulomb's constant, Z is the magnitude of the test charge in coulombs).
The answer is 236 kZ newtons
How we solve it?.

2.
A solid weights 60 ibs in air. To determine its density it is immersed in a test liquid of weight-density 10ibs/ft^3. If the solid weight 40 Ibs when immersed inthe liquid, its density is closest to :